Basic product positioning and affiliated system

Product identification: The core product is the 369 series Digital Relays, which belongs to the power system protection and control product line of GE Grid Solutions. It is mainly used for equipment protection, monitoring, and control scenarios in medium and low voltage power networks.

Document attribute: This document is a product brochure (Brochure), with the core objective of showcasing product features, advantages, and applicable scenarios to customers in the power industry (such as power companies, industrial distribution departments, and engineering general contractors). The document includes key information such as product technical highlights, application areas, and selection support.

Core product features and technological highlights

1. Multi dimensional protection function (core value)

The 369 series relay focuses on “comprehensive protection” and covers common types of equipment failures in the power system, including:

Overcurrent protection: For overload and short circuit faults of equipment such as lines, transformers, motors, etc., multiple protection logics such as definite time and inverse time are provided to adapt to different load characteristics.

Grounding fault protection: supports residual current detection, quickly identifies single-phase grounding, three-phase unbalanced grounding and other faults, and avoids fault expansion (especially suitable for neutral point ungrounded or arc suppression coil grounded systems).

Special equipment protection: customized protection algorithms are provided for specific equipment such as transformers (such as over temperature and differential auxiliary protection), motors (such as locked rotor and phase loss protection), capacitors (such as overvoltage and undervoltage protection), etc.

Backup protection function: It can serve as a backup for the main protection and automatically activate when the main protection fails, ensuring the “multi-level protection” of the power system and improving power supply reliability.

2. Monitoring and data collection capabilities

Real time parameter monitoring: Continuously collect electrical parameters such as voltage, current, power, frequency, power factor, etc., with accuracy meeting industrial standards (such as current measurement accuracy ± 0.5%, voltage ± 0.2%), and supporting remote data reading.

Fault recording and event recording: When a fault occurs, automatically record the waveform of electrical parameters before and after the fault (the recording time can be configured) and the timing of events (such as switch action time, protection action logic), which facilitates post fault analysis and responsibility tracing.

Status diagnosis: Monitor the hardware status of the device (such as power supply and sampling module) and the operating trend of the protected equipment (such as motor winding temperature trend), and provide early warning of potential faults (such as module aging and equipment degradation).

3. Control and communication characteristics

Local/Remote Control: Supports local panel operations (such as manual opening and closing, protection setting modification) and remote control (remote control of switches and setting issuance through communication interfaces), suitable for the needs of “unmanned substations” or “remote operation and maintenance”.

Flexible communication interface: Ethernet (such as Modbus TCP, IEC 61850), serial port (RS-485/232, such as Modbus RTU) and other communication protocols are standard or optional, which can be connected to SCADA (Supervisory Control and Data Acquisition System), DCS (Distributed Control System) or power automation platforms to achieve data interconnection and intercommunication.

Fixed value management: supports multiple sets of protection fixed value storage and switching (such as “operation fixed value” and “maintenance fixed value”), adapts to different operating conditions (such as seasonal load changes and equipment maintenance modes), and the switching process does not require power outage.

4. Usability and reliability design

Human computer interaction: equipped with a small LCD display screen (supporting Chinese/English interface switching) and buttons, with intuitive operation; Some models support exporting data (such as fault recording files and operation logs) through the USB interface, simplifying on-site debugging.

Hardware reliability: Industrial grade components are used, with a protection level of IP30 (panel installation) or IP20 (cabinet installation), and a working temperature range covering -40 ° C to+70 ° C, suitable for harsh industrial environments such as high and low temperatures, humidity, electromagnetic interference, etc; Support redundant power input (optional) to avoid protection failure caused by single power failure.

Compliance: Complies with international and industry standards, such as IEC 60255 (General Standard for Relays), ANSI/IEEE C37.20.1 (Standard for Metal Enclosed Switchgear), GB/T 14598 (Chinese Relay Protection Equipment Standard), ensuring compliant use in different countries/regions.

Applicable application scenarios

The 369 series relays are widely used in various fields of medium and low voltage power systems due to their strong versatility and flexible adaptability, including:

Industrial power distribution systems, such as motor control centers (MCC), transformer cabinets, and capacitor compensation cabinets in factory workshops, protect critical production equipment from faults and reduce downtime losses.

Commercial and civil buildings, such as large shopping malls, office buildings, and data centers, use power distribution systems to ensure stable power supply for important loads such as air conditioning, lighting, and IT equipment, avoiding business interruptions caused by power outages.

Power distribution network: such as 10kV/0.4kV lines, ring main units, and box type substations in urban distribution networks, serving as line protection and monitoring nodes to enhance the reliability and operational efficiency of the distribution network.

Renewable energy access: Adapt to the grid connection protection of distributed photovoltaics and small-scale wind power, prevent the impact of new energy generation fluctuations on the power grid, and ensure grid connection safety (such as overvoltage and overclocking protection).

Customer Value and Service Support

1. Customer core revenue

Improving reliability: By using multi-level protection and rapid fault removal, the equipment damage rate is reduced and the duration of power outages is reduced (such as fault removal time ≤ 50ms, which is much faster than traditional relay protection).

Reduce operation and maintenance costs: remote monitoring and diagnostic functions reduce the frequency of on-site inspections; Fault recording and event recording simplify fault analysis and shorten fault handling time.

Flexible Expansion: Supports seamless integration with other power automation products from GE Grid Solutions, such as SCADA systems and distribution management platforms, to meet customers’ upgrade needs from single point protection to system intelligence.

2. Service and Support

The brochure mentions that GE provides full lifecycle services, including:

Selection support: Provide customized selection suggestions based on the customer’s equipment type (such as transformer capacity, motor power) and power grid topology (such as radiation network, ring network).

Installation and debugging: Provide technical manuals, on-site debugging guidance (or paid on-site services) to ensure that the product is correctly integrated into the system.

After sales maintenance: Provide spare parts supply, software upgrades (such as protection algorithm updates), fault repairs, and other services to ensure the long-term stable operation of the product.

Product series and selection tips

Model subdivision: The 369 series includes different sub models (such as 369-P, 369-M, 369-C), focusing on “line protection”, “motor protection”, and “capacitor protection” respectively. Customers need to choose the corresponding sub model according to the type of protected equipment.

Configuration options: Some functions (such as redundant power supply, IEC 61850 communication, temperature acquisition module) are optional configurations, and customers can flexibly customize according to their actual needs (such as whether they need to connect to the smart grid platform).

Basic product information

Product Identification and Distribution: Model ZMI 7702 Laser Head, developed by Zygo Corporation, with Lambda Photometrics Limited responsible for distribution in the UK and Ireland; Document number SS-0079 02/20, copyright belongs to Zygo Corporation in 2020.

Product model and core configuration

Different part numbers (P/N) correspond to different parameters, as shown in the table below:

Part number (P/N), output power, beam diameter, installation method (MOUNT)

8070-0102-31, 8070-0102-32>400 µ W 6 mm 3 mm Narrow (Narrow)

8070-0102-33, 8070-0102-34>400 µ W 6 mm 3 mm Wide

8070-0102-35, 8070-0102-36>525 µ W 6 mm 3 mm Narrow

Key technical parameters

（1） Physical characteristics

Size and Weight: The weight is 5.5 kg, and the specific external dimensions need to refer to the dimensions shown in the document (Dimensions: See Figure). Different configurations (31/32/35/36 and 33/34) correspond to different size data. For example, the partial dimensions of configuration 31/32/35/36 are 458.9 mm, 124.0 mm, etc., while the partial dimensions of configuration 33/34 are 360.0 mm, 84.0 mm, etc.

Material and cable gap: The casting material is aluminum alloy, and the narrow support foot material is Ultem 2400; The nominal cable clearance is 135 mm.

（2） Electrical parameters

Power requirements (maximum):+15 VDC (allows ± 0.5 V fluctuation, current 2.1 A), -15 VDC (allows ± 0.5 V fluctuation, current 1.2 A).

Power consumption (maximum): 39 W during operation and 50 W during preheating.

（3） Laser characteristics

Laser type: Helium Neon laser, continuous wave (CW), heterodyne, linearly polarized.

Key performance indicators:

Beam pointing stability:<0.5 arc/° C.

Power on to light output time: typical value<10 seconds, maximum value 70 seconds.

Wavelength stabilization time: typical value of 10 minutes.

Frequency difference: 20 MHz ± 1600 Hz.

Vacuum wavelength (vertical polarization F1): 632.991501 nm; Vacuum wavelength (horizontal polarization F2): 632.991528 nm.

Vacuum wavelength lifetime accuracy: ± 0.1 ppm; Vacuum wavelength stability: 0.005 ppm/1 hour, 0.01 ppm/24 hours.

Safety level: DHHS laser safety classification is Class II, in compliance with NCDRH regulations.

（4） Environmental parameters

Environmental conditions, working status, non working status

Temperature 10 to 30 ° C -40 to 75 ° C

Humidity 0 to 90%, non condensing 0 to 90%, non condensing

Impact -40g impact within 11 milliseconds, acting on three orthogonal axes

In addition, only 35/36 products are equipped with Sync Connectors.

Installation precautions

First, the importance of industrial equipment installation

In modern industrial production, various equipment and machines are widely used in various fields, such as manufacturing, energy industry, chemical industry and so on. The installation of industrial equipment is directly related to production efficiency and product quality. Proper installation and commissioning of good equipment can ensure the stable operation of the production line, improve production efficiency and product quality, reduce maintenance costs, and ensure the safety of employees.

Second, the steps of industrial equipment installation

1. Preparation: Before the installation of industrial equipment, it is necessary to carry out adequate preparation work. This includes the tools and equipment required for installation, cleaning and preparation of the installation site, and making installation plans and schedules.

2. Determine the installation position: Determine the installation position of the equipment according to the requirements of the equipment and the layout of the production line. When determining the location, the weight and size of the equipment need to be considered, as well as the coordination of the equipment with the surrounding environment.

3. Install the device: Assemble and install the device according to the installation instructions. Ensure that the device is securely and accurately connected, while protecting the appearance and internal components of the device.

4. Connect power supplies and pipelines: For devices that require power supplies and power supplies, properly connect power supplies and pipelines. The connection of power supply and pipeline should comply with safety standards to avoid hazards such as electric shock and leakage.

5. Commissioning the device: After the installation is complete, you need to commission the device to ensure that the device can run properly. It includes checking the functions and performance of the equipment, adjusting the parameters and Settings of the equipment, and carrying out the necessary tests and inspections.

6. Training operators: After the installation of the equipment, it is necessary to train the operators to understand the operation methods and precautions of the equipment, and improve the operation skills and safety awareness of the employees.

Third, industrial equipment installation precautions

1. Safety first: When installing industrial equipment, safety is the most important consideration. You must operate in strict accordance with safety regulations and wear necessary protective equipment to ensure the safety of the workplace.

2. Strictly follow the equipment instructions: Industrial equipment usually comes with detailed installation instructions, you must carefully read and understand the contents of the instructions, and install the operation in accordance with the requirements of the instructions.

3. Pay attention to the assembly sequence: When installing the device, follow the correct assembly sequence to ensure that all components of the device are assembled correctly to avoid equipment failures or safety accidents caused by incorrect assembly sequence.

Basic product information

Product Code and Configuration: Model ZMI 501A, corresponding to part number (P/N) 8020-0237-05, with 2 channels

Physical characteristics

Dimensions and Weight: The weight is 2 pounds (approximately 1 kilogram), and the specific external dimensions need to refer to the figures in the document (Dimensions: See Figure)

Cable gap: The gap between both ends of the cable is 5 inches (127 millimeters)

Installation and heat dissipation: Adequate ventilation space should be reserved to ensure heat dissipation, and it cannot be installed near the measuring axis; The bottom mounting hole includes two specifications, M3 threaded hole (depth 4 millimeters) and 6-32 UNC threaded hole (depth 1/8 inch), with the use of 6-32 UNC threaded hole being optional

Electrical parameters

Power requirements: The nominal power supply is+5.2 volts direct current (VDC), with an allowable voltage fluctuation range of -0.0/+0.4 volts, and a working current of 3.3 amperes

Environmental parameters

Working temperature: Applicable temperature range is 0 to 40 degrees Celsius

Working humidity: Suitable humidity range is 0 to 85%, and it needs to be in a non condensing environment

Core specifications of measuring board

Basic configuration: A single measurement board supports 2 axes (Number of Axes per Board: 2), with a minimum optical input power of ≥ 8 microwatts (μ W) and a linear accuracy of 1.3 LSB

Serial (Orthogonal) Data Specification (Based on Dual Channel Interferometer):

Highest position resolution: λ/512 (approximately 1.24 nanometers)

Maximum position range: 10.6 meters

Maximum speed of target reflector: 475 millimeters per second

Data rate: selectable between 3 and 24 megahertz (MHz)

Parallel data specification (based on dual pass interferometer):

Position resolution: fixed at λ/512 (approximately 1.24 nanometers)

Position range: fixed at ± 10.6 meters

Maximum speed of target reflector: 475 millimeters per second

Precautions

Safety specifications are generally applicable to control system handling. Instructions and warnings related to a specific subject or operation of the product.

The following norms must be strictly observed:

  must strictly comply with the technical specifications and typical applications of the product system

  Personnel training: Only trained personnel shall install, operate, maintain or repair the product system. must

Provide guidance and explanation of the situation in danger areas to these personnel.

  Unauthorized changes: Changes or structural changes to the product system may not be made.

  Maintenance responsibility: Must ensure that the product system is used only under appropriate conditions and in full fitness for use.

 Working environment: The user must meet the specified environmental conditions:

Safety regulation

The following safety provisions of EN 50110-1 shall be fully complied with when handling product systems (maintenance) :

1 Disconnect completely.

2 Secure to prevent reconnection.

3 Verify that the installation is complete.

4 Ground and short-circuit the device.

Warning: Only qualified maintenance personnel can remove and insert the module. In order to ensure the personal safety of the operator, before each pulling out or inserting, you must

Disconnect the power supply and ensure that there is no voltage on all terminals at the back, and the product is effectively grounded with the ground screw at the back.

Basic product identification

Core code: Product ID is 3BSE050090R65, ABB model identification is PFEA111-65, and the product name is uniformly “Tension Electronics PFEA111-65” (Tension Electronic Equipment)

Classification: Belonging to the sub field of “force measurement” under the “measurement and analysis” category, specifically corresponding to the Web Tension Measurement category, suitable for devices such as PFC300, PFT300, PFR100, PFT100, etc

Product specifications and attributes

Technical parameters: Supports 2 weighing sensor inputs, with voltage and current output (A+B) functions, and adjustable filtering output; Equipped with a display screen, it can display four types of measurement data: A, B, A+B, A-B; Comes with a CD user manual for the product

Physical and packaging information: The gross weight and net weight are both 1kg; the unit for packaging level 1 is 1 piece, and the minimum order quantity and order multiple are both 1 piece; The frame dimensions are labeled as “Spare_Parts” (spare parts), and the protection level is described as “Tension Electronics IP65” (IP65 level for tension electronic devices)

Trade and Compliance Information: Country of Origin is Sweden, Customs Tariff Number 85389091, UNSPSC Code 39120000; Not classified as WEEE (Waste Electrical and Electronic Equipment); Not ‘Made To Order’ (No), not ‘Quote Only’ (No), and in stock, located in Malm ö, Sweden

Installation precautions

First, the importance of industrial equipment installation

In modern industrial production, various equipment and machines are widely used in various fields, such as manufacturing, energy industry, chemical industry and so on. The installation of industrial equipment is directly related to production efficiency and product quality. Proper installation and commissioning of good equipment can ensure the stable operation of the production line, improve production efficiency and product quality, reduce maintenance costs, and ensure the safety of employees.

Second, the steps of industrial equipment installation

1. Preparation: Before the installation of industrial equipment, it is necessary to carry out adequate preparation work. This includes the tools and equipment required for installation, cleaning and preparation of the installation site, and making installation plans and schedules.

2. Determine the installation position: Determine the installation position of the equipment according to the requirements of the equipment and the layout of the production line. When determining the location, the weight and size of the equipment need to be considered, as well as the coordination of the equipment with the surrounding environment.

3. Install the device: Assemble and install the device according to the installation instructions. Ensure that the device is securely and accurately connected, while protecting the appearance and internal components of the device.

4. Connect power supplies and pipelines: For devices that require power supplies and power supplies, properly connect power supplies and pipelines. The connection of power supply and pipeline should comply with safety standards to avoid hazards such as electric shock and leakage.

5. Commissioning the device: After the installation is complete, you need to commission the device to ensure that the device can run properly. It includes checking the functions and performance of the equipment, adjusting the parameters and Settings of the equipment, and carrying out the necessary tests and inspections.

6. Training operators: After the installation of the equipment, it is necessary to train the operators to understand the operation methods and precautions of the equipment, and improve the operation skills and safety awareness of the employees.

Third, industrial equipment installation precautions

1. Safety first: When installing industrial equipment, safety is the most important consideration. You must operate in strict accordance with safety regulations and wear necessary protective equipment to ensure the safety of the workplace.

2. Strictly follow the equipment instructions: Industrial equipment usually comes with detailed installation instructions, you must carefully read and understand the contents of the instructions, and install the operation in accordance with the requirements of the instructions.

3. Pay attention to the assembly sequence: When installing the device, follow the correct assembly sequence to ensure that all components of the device are assembled correctly to avoid equipment failures or safety accidents caused by incorrect assembly sequence.

Core framework and scope of application of the document

The document follows the logical mainline of “security standards → hardware awareness → installation and practical operation → functional verification”, covering the entire process of controller preparation to later testing. The applicable product is GuardPLC 1800 safety controller, which is a programmable electronic system (PES) with safety certification. It integrates 24 digital inputs, 8 digital outputs, 2 high-speed counters, 8 analog inputs, and 4 GuardPLC Ethernet communication interfaces. It complies with SIL 3 (IEC 61508) and PLe (ISO 13849-1 Cat.4) safety levels and is suitable for scenarios with extremely high requirements for fault tolerance and risk control, such as mechanical safety control and process safety monitoring.

Core content sorting

（1） Controller Overview and Safety Standards

Core functions and hardware composition

Function integration: Supports the separation of secure and non secure communication. Secure communication is connected to distributed I/O, other GuardPLC controllers, or OPC servers through 4-channel 10/100BaseT RJ45 interfaces (GuardPLC Ethernet protocol); Non secure communication is achieved through 3-channel 9-pin D-shell interfaces (RS-485, etc.) to realize functions such as Modbus slave and Profibus DP slave (only 1753-L32BBBP-8A).

Hardware structure: including DIN rail installation buckle, 24V DC power interface, I/O plug-in terminal, high-speed counter interface, Ethernet interface (top 2+bottom 2), reset button (received design, anti misoperation), status indicator lights (24V DC, RUN, ERROR, PROMess, etc.). The controller is of open design and needs to be installed in a closed enclosure (protection level ≥ IP20).

Safety and Environmental Regulations

Operation qualification: It must be operated by trained professionals who are familiar with the application requirements of safety related PES (such as EN ISO 13849-1, IEC 61508).

Static electricity protection: The controller is sensitive to static electricity. When operating, it is necessary to touch a grounded object to discharge and wear a grounding wristband. It is forbidden to touch the pins or components of the circuit board. When idle, it should be stored in anti-static packaging.

Environmental requirements:

Working temperature: 0 ° C~60 ° C (32 ° F~140 ° F), storage temperature: -40 ° C~85 ° C (-40 ° F~185 ° F);

Relative humidity of 10%~95% (no condensation), pollution level 2 industrial environment, altitude ≤ 2000 meters (no need to downgrade);

It needs to be installed inside a metal casing with flame retardant properties (flame propagation level 5VA/V0, etc.), and the interior can only be accessed through tools to avoid the risk of electric shock.

（2） Installation process: from fixing to grounding

DIN rail installation (only supports DIN rail, not panel installation)

Align the guide rail: Hang the top slot of the controller on the IEC standard DIN rail (such as 199-DR1), and it is recommended to use galvanized yellow chromium steel material for the guide rail (to ensure good grounding). Fix it every 200mm (7.8 inches) and install end anchors.

Locking device: Insert a flathead screwdriver into the gap between the housing and the buckle, pull the buckle downwards, push the controller towards the guide rail, and release the buckle to complete the locking process; Reverse the operation during disassembly.

Heat dissipation requirements: Install horizontally with a minimum gap of 100mm (3.94 inches) above and below, avoiding installation above heating equipment to ensure air circulation. Install a fan if necessary.

Grounding configuration

Double grounding: The controller is functionally grounded through DIN rail, and protective grounding must be connected through a dedicated grounding screw (with grounding symbol) in the upper left corner of the housing. The grounding wire must comply with local electrical regulations (refer to Industrial Automation Wiring and Grounding Guidelines 1770-4.1).

Guide rail requirements: It is prohibited to use guide rails made of aluminum, plastic, or other materials that are prone to corrosion or have poor conductivity, in order to avoid equipment failure or safety risks caused by poor grounding.

（3） Wiring Specification: Power Supply and I/O Circuit

Power wiring (24V DC)

Power requirements: An isolated power supply that complies with EN 60950/UL 1950 must be used, and it must be of the SELV (Safety Extra Low Voltage) or PELV (Protection Extra Low Voltage) level. The SELV voltage should be ≤ 30V rms/42.4V peak/60V DC, and the PELV must be connected to a protective grounding.

Wiring details: Connect the power supply through a 4-pin terminal, and ensure that L+(positive pole) and L – (negative pole) are correctly connected (without reverse polarity protection, as reversing the connection may damage the controller); The terminal supports a maximum of 2.5mm ² (14 AWG) wire and requires external 10A delay fuse protection; The L+and L – terminals are internally connected, and 24V DC Daisy chain power can be supplied to other devices through the remaining terminals.

Current characteristics: The maximum current consumption of the controller is 9A (including I/O load), and it requires 1A for its own operation. The remaining 8A can be used to power input/output devices.

Digital input wiring (24 channels, divided into 3 groups, with 8 channels per group)

Power supply and circuit: Each set of inputs is powered by an independent LS+(24V DC sensor power supply with short-circuit protection), and the input signal is referenced to L – (common terminal); Supports dry contact input or sensors with independent power supply (such as safety light curtains), and the negative pole of the external power supply needs to be connected to the controller L.

Safety design: Following the “closed circuit principle”, the input signal is reset to “0” by default in case of a fault (power-off safety state); If an input fault (such as a short circuit) is detected, the input signal of the fault channel is forced to be “0”, and the FAILT indicator light is activated.

Terminal specifications: The terminal supports 0.13-1.3mm ² (26-16 AWG) wires, with a tightening torque of 0.51N · m (4.5 lb · in). Terminals 11-20, 21-30, and 31-40 correspond to three sets of input LS+, input channel, and L-。

Digital output wiring (8 channels)

Load capacity:

At channels 1-3 and 5-7, the maximum current per channel is 0.5A at 60 ° C;

Channels 4 and 8 (heavy-duty channels): 1A/channel at 60 ° C, 2A/channel at 50 ° C;

The total output current is ≤ 7A, with a minimum load of 2mA per channel. When overcurrent occurs, the output is turned off and automatically restored after troubleshooting.

Wiring requirements: The output circuit should use L – (terminal 1/10) of the corresponding group as the common terminal. Even if L – is internally connected, it is still recommended to use it according to the group (EMC test verification configuration); It is recommended to parallel 1N4004 diodes to suppress interference voltage for inductive loads.

Safety feature: In the event of a fault, all outputs are forced to shut down (in a power-off safety state), and there is no monitoring of the external circuit. However, a short circuit will trigger a fault indication.

Analog input wiring (8 channels, single polarity)

Signal type:

Voltage signal: 0~10V DC (requires an external 10k Ω shunt resistor);

Current signal: 0~20mA (requires an external 500 Ω shunt resistor);

Unused analog inputs need to be short circuited (connected to I and L -) to avoid interference.

Wiring specifications: Use shielded twisted pair cables, with both ends of the shielding layer grounded, and a maximum wiring length of 300m (984 feet); Terminals 41-64 correspond to transmitter power supply (T1-T8), signal input (I1-I8), and reference terminal (L -) with 8 inputs, supporting 0.13-1.3mm ² (26-16 AWG) wires.

High speed counter wiring (2 channels, 24 bits)

Function configuration: Each counter includes three terminals: A (counting input), B (direction input), and Z (reset input). It supports 5V/24V DC signals and has a maximum input frequency of 100kHz. It can be used as a counter or a 3-digit Gray code decoder.

Wiring requirements: Use shielded twisted pair cables, with both ends of the shielding layer grounded, and a maximum wiring length of 500m (1640 feet); Terminals 65-72 correspond to A1/B1/Z1/L – and A2/B2/Z2/L – of the 2-channel counter, and unused inputs do not need to be terminated.

（4） Communication connection: Separation of secure and non secure

Secure Communication (GuardPLC Ethernet)

Interface configuration: 4 RJ45 interfaces (top 2+bottom 2), connected internally through an Ethernet switch, supporting automatic negotiation (full/half duplex, 10/100Mbps), can use direct or crossover Ethernet cables, supporting star/line topology (network loops are prohibited).

Application scenario: Connect distributed security I/O, other GuardPLC controllers, OPC servers (requiring 1753-OPC modules) and programming software, with MAC address attached to the bottom RJ45 interface.

Non secure communication (3-channel 9-pin D-shell interface)

Interface function:

COMM1：RS-485， Supports Modbus slave (1753-L32BBBM-8A) or Profibus DP slave (1753-L32BBBP-8A);

COMM2: Reserved (TBD);

COMM3：RS-485， Support GuardPLC ASCII protocol;

Pin definitions: Pin 3 (RxD/TxD-A) and Pin 8 (RxD/TxD-B) are for data transmission and reception, Pin 5 (DGND) is for data ground, Pin 6 (VP) is for 5V power supply, and Pin 4/9 are for control signals.

Default parameters: IP address defaults to 192.168.0.99, system ID (SRS) defaults to 60000, and custom parameters can be recorded through transparent labels (note not to obstruct ventilation holes).

（5） Fault diagnosis and status indication

Reset button operation

Trigger scenario: When forgetting the online password for programming software and unable to obtain IP address/SRS, use an insulated needle to press the reset button (top received hole, 4-5cm from the left edge).

Reset process: Press and hold the button for 20 seconds, while restarting the controller (power off and then on). After resetting, only the default account is retained, and the IP address/SRS is restored to its default value; Restore the parameters modified before or after resetting during the next power on (depending on whether they have been modified).

Controller self-test

Power monitoring: Alarm 1 is triggered when the 24V DC voltage is below 19.3V (recording internal variables), alarm 2 is triggered when the voltage is below 15.4V (preparing to shut down), and automatic shutdown is triggered when the voltage is below 13.0V.

Temperature monitoring: A warning is triggered when the temperature is between 60 ° C and 70 ° C, a main alarm is triggered when the temperature is above 70 ° C, and the main alarm is released when the temperature drops to 64 ° C and 54 ° C (the warning is retained). When the temperature drops below 54 ° C, it returns to normal.

Interpretation of status indicator lights

|Indicator light | Status | Meaning|

|24V DC | Always on | 24V DC power supply is normal|

|| Off | No power supply or power failure|

|RUN | Always on | Running normally (executing programs, processing I/O, communication, self-test)|

|| Blinking | STOP mode (no program executed, output reset, triggered by emergency stop)|

|| OFF | VNet STOP mode (see ERROR light)|

|ERROR | Always on | Hardware failure (controller, I/O, counter), system software error, watchdog timeout (out of cycle), software restart required|

|| Off | No errors|

|PROGress | Always on | Uploading new controller configuration|

|| Blinking | Upload new operating system to non-volatile ROM|

|FAULT | Always on | Program logic error, configuration failure, operating system damage|

|| Flashing | ROM write error, I/O failure|

|OSL | Blinking | Emergency Operating System Loader Activation|

|BL | Blinking | Boot loader unable to load operating system|

|Ethernet (green/yellow) | Green constant light | Full duplex; Huang Changliang: Connection establishment|

|| Green flashing | Conflict; Yellow flashing: Interface activity|

（6） Technical specifications and certification

Core parameters

Memory: Maximum 250KB user program memory, 250KB application data memory;

Safety performance: minimum watchdog time of 10ms, minimum safety time of 20ms;

Insulation voltage: 50V DC (basic insulation) between I/O and Ethernet, Ethernet and DC power supply;

Protection level: IP20 (controller body), size 257 × 114 × 66mm (width × height × depth), weight 1.2kg.

Safety certifications: UL Listed (USA&Canada), CE (EMC Directive 2004/108/EC), C-Tick (Australia), T Ü V certification (SIL 3/IEC 61508, PLe/ISO 13849-1).

Key considerations and supplementary resources

Compliance verification: Wiring must comply with local electrical regulations (such as NEC, IEC), and safety circuit design must meet corresponding safety level requirements to avoid reducing safety performance due to improper configuration.

EMC protection: Shielded wires are required for analog inputs, high-speed counters, and Ethernet, with both ends of the shielding layer grounded; Install a filter in the power circuit to reduce the impact of electromagnetic interference on safety functions.

Core framework and scope of application

The document follows the logical mainline of “safety specifications → system positioning → hardware configuration → installation and operation → fault handling”, covering the entire process of module configuration from early stage to later stage maintenance. The applicable product is the 1747-DCM direct communication module, which serves as the communication interface module for SLC 500 series controllers (including extended chassis or modular controllers). It is connected to higher-level Allen Bradley controllers (such as PLC-2/3/5, SLC with RIO scanner) through RIO (Remote I/O) links to achieve data transmission between distributed processors, and is suitable for multi controller collaboration scenarios in industrial automation (such as multi area data exchange in production lines and remote device monitoring).

Core content sorting

（1） System positioning and hardware characteristics

Module core functions

Communication bridge function: manifested as an RIO adapter on the RIO link, it supports communication with PLC processors (such as PLC-5/250) or independent RIO scanners (1771-SN, 1747-SN) with integrated RIO scanners, enabling bidirectional data transmission between the upper level controller and the distributed SLC 500 controller.

Expansion node capability: Supports expansion node functionality. If all scanners and adapters on the RIO link have this capability, up to 32 adapters can be connected. At full baud rate, 82 Ω terminal resistors (1/2W) need to be connected at both ends of the link to ensure signal integrity.

Hardware structure and key components

Physical components: including self-locking buckle (fixing module to chassis), 2 sets of DIP switches (configuration parameters), 2 status LEDs (red FAULT light, green COMM light), RIO link connector (front end), cable fixing slot, side label (module information), door label (parameter identification). The module is a full-size circuit board and needs to be installed in the non-zero slot of SLC 500 chassis (slot 0 reserved for CPU).

Status LED function:

FAULT light (red): Always on indicates an internal fault, flashing indicates a configuration error, and off indicates normal operation.

COMM light (green): Always on indicates normal communication, flashing indicates that the upper level processor is in programming/testing/fault mode, and off indicates communication interruption (such as scanner not connected or link failure).

（2） Module configuration: DIP switch parameter setting

The 1747-DCM contains 2 sets of 8-bit DIP switches (SW1, SW2), which need to be configured before installation. The key parameters are as follows:

1. SW1 (chassis address and starting I/O group)

Rules for configuring switch position functions

SW1-1~SW1-6 logical chassis addresses correspond to the chassis number (octal) of the higher-level scanner. The switch status needs to be selected according to the scanner type (PLC-2/3/5, 1747-SN). For example, chassis address 1 of PLC-5/250 corresponds to SW1-1~5 being ON and SW1-6 being OFF

The starting I/O group numbers for SW1-7~SW1-8 only support even numbers (0/2/4/6) and need to match the chassis size:

-0 (ON+ON): Suitable for all sizes

-2 (ON+OFF): Suitable for 3/4, 1/2, and 1/4 sizes

-4 (OFF+ON): Suitable for 1/2 and 1/4 sizes

-6 (OFF+OFF): Only compatible with 1/4 size

2. SW2 (data rate, fault handling, chassis attributes)

Rules for configuring switch position functions

SW2-1~SW2-2 data rates support three baud rates, which need to be consistent with the RIO link:

-57.6K baud (ON+ON): Maximum cable length 3048m (Belden 9463)

-115.2K baud (ON+OFF): Maximum 1524m

-230.4K baud (OFF+ON): maximum 762m

-Disable (OFF+OFF): Do not enable communication

When SW2-3 fault occurs, clear all data bits in the input image table (status bits are retained) – OFF: When there is a communication fault with RIO or when the upper level processor enters fault mode, clear all data bits in the input image table

-ON: Maintain the last state of the data bit in case of malfunction (confirm that there is no safety risk)

SW2-4 Last chassis identifier – OFF: The module shares logical chassis with other adapters and is the device with the highest I/O group number in the chassis

-ON: Not the last chassis device

SW2-5~SW2-6 logical chassis size allocation allocates the image space of modules in the scanner, determining the number of data transmission words:

-1/4 size (ON+ON): 1 status word+1 data word (2 words in total)

-1/2 size (ON+OFF): 1 status word+3 data words (4 words in total)

-3/4 size (OFF+ON): 1 status word+5 data words (a total of 6 words)

-Full size (OFF+OFF): 1 status word+7 data words (a total of 8 words)

Key note: Module images cannot cross logical chassis boundaries. For example, selecting the starting I/O group 6 while configuring as 1/2 size will trigger a configuration error.

（3） Installation and wiring: practical operation specifications

Pre-installation preparation

Power requirements: Power is obtained through the SLC 500 chassis backplane, requiring a current of+5V DC/360mA. Before installation, the remaining capacity of the chassis power supply needs to be confirmed; The fixed SLC 500 controller’s 2-slot expansion chassis only supports one 1747-DCM and requires reference to the 1746-2.35 manual to confirm compatibility with other I/O modules.

Electrostatic protection: The module contains sensitive electronic components, and before installation/disassembly, it is necessary to touch a grounded object to discharge electricity and avoid electrostatic damage.

Switch pre configuration: DIP switch settings (chassis address, data rate, chassis size, etc.) must be completed before installing the module to avoid repeated disassembly after installation.

Module installation steps

Power off operation: Disconnect the chassis power supply to ensure safe installation.

Align the guide rail: Align the full-size circuit board with the upper and lower guide rails of the chassis, and confirm that the module is not installed in slot 0 (slot 0 is reserved for the CPU).

Fixed module: Slide the module to the self-locking buckle to ensure reliable contact between the module and the backplane connector.

Connect RIO cable: Connect the RIO link cable to the front-end connector of the module, use cable fixing slots and zip ties to secure the cable and prevent it from loosening.

Covering empty slots: Cover unused slots with 1746-N2 slot fillers to prevent dust from entering or electric shock risks.

RIO Link Wiring Specification

Cable selection: It is recommended to use Belden 9463 cable, which supports differential signal transmission and has strong anti-interference ability.

Terminal resistance: A 1/2W terminal resistance should be connected at both ends of the link (scanner and the last physical device), and the resistance value should be selected based on whether the expansion node function is enabled

Enable extended node: Use 82 Ω for full baud rate (color ring: gray red black gold).

Extension node not enabled: 150 Ω (brown green brown gold) for 57.6K/115.2K baud, 82 Ω for 230.4K baud.

Wiring definition: The link includes Line 1 (blue), Line 2 (transparent), and a shielding layer. The shielding layer needs to be grounded at one end to avoid interference signals from ground current.

（4） Troubleshooting: LED Status and Handling

Fault interpretation of FAULT light (red)

|LED status | Reason for malfunction | Solution|

|Always on | Internal module faults (such as circuit and memory errors) | Restart I/O chassis containing 1747-DCM; If it still lights up after restarting, replace the module|

|Flashing | Configuration error (such as mismatch between I/O group and chassis size, chassis address error) | Check DIP switch settings to ensure compatibility between the starting I/O group and chassis size, and confirm that the chassis address matches the scanner|

|Extinguish | Normal state | No operation required|

COMM light (green) fault interpretation

|LED status | Reason for malfunction | Solution|

|Always on | Communication is normal | No operation required|

|Blinking | The upper level RIO scanner processor is in programming/testing/fault mode | Investigate the scanner processor fault and restart 1747-DCM after restoring normal mode|

|Extinguish | 1 The scanner is not connected to the processor

2. Scanner chassis disabled

3. No communication between 1747-DCM and scanner (baud rate mismatch, loose cable, connector not installed) | 1 Confirm that the scanner is correctly installed in chassis

2. Check the integrity of the scanner chassis and restart the module after repairing it

3. Verify the baud rate between 1747-DCM and scanner, check cable connections and connector installation|

（5） Technical specifications and safety standards

Core technical parameters

|Category | Specification|

|Power consumption | Backboard power supply,+5V DC/360mA|

|Working temperature | 0 ° C~+60 ° C (32 ° F~+140 ° F)|

|Storage temperature | -40 ° C~+85 ° C (-40 ° F~+185 ° F)|

|Humidity | 5%~95% (no condensation)|

|Certification | UL certification, CSA certification, Class I Division 2 (A/B/C/D groups) hazardous environment certification, CE compliance, C-Tick labeling|

|Physical dimensions | Full size SLC 500 module, compatible with standard SLC chassis slots|

Safety regulations for hazardous environments

The module is only applicable to Class I Division 2 (A/B/C/D groups) hazardous or non hazardous environments and is prohibited from being used in higher-level hazardous areas.

Taboos for operating in hazardous environments: Do not replace components or disconnect equipment (unless power is cut off), do not connect/disconnect components with electricity, all wiring must comply with NEC 501-4 (b) specifications, and do not replace components that may affect the applicability of hazardous environments.

Key considerations and supplementary resources

Compatibility check: The expansion of node functionality requires support from all devices (scanners, adapters) on the RIO link; When installing the 2-plot expansion chassis, it is necessary to confirm compatibility with other I/O modules (refer to manual 1746-2.35).

Configuration consistency: The DIP switch settings need to match the higher-level scanner, especially the chassis address, data rate, and chassis size, to avoid communication failures caused by parameter mismatches.

Wiring specifications: RIO cables should be kept away from power lines (to avoid electromagnetic interference), the shielding layer should be grounded at one end, terminal resistors should only be installed at both ends of the link, and intermediate equipment does not need to be installed.

Core framework and scope of application of the document

The document follows the logical mainline of “technical principles → practical procedures → fault handling”, consisting of 10 core chapters and 4 appendices, with a complete structure and emphasis on practicality. The applicable product is the 1746-NI8 analog input module, which is a single slot module for SLC 500 control systems. It supports 8 analog input channels and can be connected to voltage (such as ± 10V DC, 0-5V DC) or current (such as 4-20mA, 0-20mA) signals. It is suitable for signal acquisition of sensors, transmitters and other devices and is widely used in industrial process parameter monitoring scenarios such as temperature, pressure, flow rate, liquid level, etc.

Core chapter content sorting

（1） Product Overview: Functions and Core Features

Module positioning and hardware composition

Core function: Convert analog input signals (voltage/current) into digital signals through an A/D converter, store them in an input mapping table, and provide them for SLC 500 processors (such as SLC 5/02, 5/03, 5/04) to read. It supports two interface modes: Class 1 (basic configuration) and Class 3 (extended configuration, including user-defined scaling and status monitoring).

Hardware structure: including detachable terminal block (1746-RT25G), 8-channel status LED (green), 1-channel module status LED (green), voltage/current selection DIP switch, cable fixing slot, self-locking buckle, etc. The terminal block supports 18 position wiring and can be connected to shielded twisted pair cables (recommended Belden 8761).

Key technical characteristics

Channel configuration flexibility: 8 channels can be independently configured as single ended input or differential input, and differential input has stronger anti-interference ability; Supports 8 types of digital low-pass filtering frequencies (1Hz-75Hz), which can be selected according to the signal noise situation. Low frequency filtering (such as 1Hz) has good anti-interference effect, and high-frequency filtering (such as 75Hz) has fast response speed.

Self calibration and diagnosis: The module continuously self calibrates the enable channel without the need for manual calibration; Support power on diagnosis (internal circuit, memory detection) and channel diagnosis (open circuit, over range, configuration error detection), with fault status feedback through LED and status words.

Data format diversity: The converted digital data supports 5 formats: engineering units (1mV/step voltage, 1 μ A/step current), PID scaling (0-16383 range, adapted to SLC PID algorithm), proportional counting (-32768-32767), 1746-NI4 compatible format, and user-defined range (Class 3 mode only).

（2） Installation and Wiring: Hardware Deployment Specification

Pre-installation preparation

Environmental requirements: Operating temperature of 0 ° C-55 ° C (not the rightmost slot), 0 ° C-60 ° C (rightmost slot, better heat dissipation), storage temperature of -40 ° C-85 ° C, relative humidity of 5% -95% (no condensation), suitable for industrial environment with pollution level 2, and installed in a closed metal enclosure (protection level reference NEMA 250 or EN/IEC 60529).

Static electricity protection: The module is sensitive to static electricity. When operating, it is necessary to wear a grounding wristband, touch a grounded object to discharge electricity, and do not touch the back panel pins. When idle, it should be stored in anti-static packaging.

Power requirements: Power is obtained through the SLC 500 chassis backplane, with+5V DC (200mA) for digital circuits and+24V DC (100mA) for analog circuits, without the need for external power supply; Calculate the total chassis load to avoid power overload (refer to SLC 500 system manual).

Module installation steps

Slot selection: It can be installed in any slot of SLC 500 modular or extended chassis (except for processor slot 0). When installing multiple modules, it is recommended to place 1746-NI8 in the right slot (for better heat dissipation); The 2-plot expansion chassis (1746-A2) requires reference to the compatibility table, and some module combinations require an external power supply.

Physical installation: Align the module with the upper and lower rails of the chassis, slide it to the self-locking buckle, and ensure that the orange DIN rail locking screw is in a horizontal position (locked state); After installation, cover the unused slot (1746-N2 filler), and cover the exposed interconnection part of the last module with an end cap to prevent electric shock.

Terminal block operation: When disassembling, loosen the release screws on both sides and pull the handle upwards; When installing, first insert the handleless end (arc-shaped buckle) and rotate it to lock. The 1746-RTBS/RTB3S terminal needs to be locked/unlocked with a 3mm screwdriver (1492-N90) at a 73 ° angle.

Wiring specifications

Terminal definition: The terminal block contains 8 channels (each with ± end), 2 shielded terminals (channels 0-3 are connected to the upper shield, 4-7 are connected to the lower shield), and only one end of the shielding layer is grounded (to avoid ground circulation).

Wiring type:

Single ended input: Multiple channels share a common terminal, which can be connected to all “-” terminals through jumper wires, suitable for scenarios where signal sources and modules are grounded together.

Differential input: Each channel has independent ± terminals and strong resistance to common mode noise (common mode voltage range ± 10.5V), suitable for long-distance wiring or complex noise environments.

Wire requirements: Supports 0.25-2.5mm ² (22-14 AWG) solid/stranded copper wire (rated temperature ≥ 75 ° C), insulation layer thickness ≤ 1.2mm, terminal tightening torque ≤ 0.565N · m (5 lb in); The 2-wire/3-wire/4-wire transmitter needs to be matched with an external power supply (the module does not provide loop power).

（3） Run configuration: Address and channel management

Module identification and address allocation

ID code setting: The ID code for Class 1 mode is 3526 (8 input words+8 output words), and for Class 3 mode it is 12726 (16 input words+12 output words), which needs to be configured through programming software (such as RSLogix 500 V1.30+, APS). SLC 5/01 only supports Class 1 and 5/02 and above modes.

Memory Mapping:

Class 1: The output image (O: e.0-O: e.7) stores 8 channel configuration words, and the input image (I: e.0-I: e.7) stores 8 channel data words.

Class 3: The output image contains an additional 4 scaling range words (O: e.8-O: e.11), and the input image contains an additional 8 channel status words (I: e.8-I: e.15), which are used to monitor channel faults (such as open circuit, out of range).

Detailed explanation of channel configuration

Configuration word structure: 16 bit configuration word (O: e.x) defines channel parameters, and the key functions are as follows:

Bit 0-2: Input type (e.g. 101=4-20mA, 011=0-10V DC).

Bit 3-5: Data format (e.g. 000=engineering unit, 001=PID scaling).

Bit 6-7: Open circuit state (00=output 0, 01=upper limit value, 10=lower limit value, only valid for 4-20mA).

Bit 8-10: Filter frequency (100=10Hz, 011=20Hz).

Bit 11: Channel enabled (1=enabled, 0=disabled, data word cleared after disabled).

Configuration process: Define configuration parameters in an integer file (such as N10), write the configuration word to the module output image through the COPY instruction of the ladder program, and trigger configuration transfer with the “first scan bit (S: 1/15)” when powered on.

Data scaling and transformation

Engineering unit scaling: directly corresponding to physical quantities (such as 4-20mA corresponding to 100-500 ° C), data word value x scaling factor x (range/signal range)=actual value, for example: 5500 (1 μ A/step) x (932-212 ° F)/(20-4mA)=247.5 ° F.

PID scaling: 0-16383 corresponds to the full range of the signal, formula: actual value=lower limit value+(upper limit value – lower limit value) × (data word/16383).

User defined scaling (Class 3): Set upper and lower limits through O: e.8-O: e.11, actual value=data word x (range/(upper limit value – lower limit value)).

（4） Diagnosis and Troubleshooting: Problem Localization and Resolution

LED status interpretation

Channel status LED:

Always on: The channel is enabled and functioning normally.

Flashing: Channel malfunction (open circuit, over range, configuration error), needs to be judged in conjunction with the status word.

Off: Channel disabled or not configured.

Module status LED:

Always on: The module is running normally.

Extinguish: Module malfunction (power on diagnosis failure, hardware error), power off and restart required. If ineffective, contact the manufacturer.

Common faults and their solutions

Open circuit fault (4-20mA channel): Set the status word bit 12 to 1, check whether the sensor wiring is loose/broken, whether the sensor is damaged, and the module response time is 0.75-6ms (depending on the number of enabled channels).

Over/Under Range: Set the status words 13/14 to 1, check if the input signal exceeds the configured range (such as 4-20mA signal below 3.5mA or above 20.5mA), adjust the sensor or reconfigure the input type.

Configuration error: Set the status word bit 15 to 1. Check if the configuration word bits 0-7 (input type, data format, open circuit status) are an illegal combination (e.g. bits 6-7=11), and rewrite the configuration word.

Module unresponsive: Check the backplane power supply (+5V/+24V), whether the module is fully inserted into the slot, and whether the chassis is overloaded. If the fault persists after power failure and restart, the module needs to be replaced.

Maintenance and spare parts

Replaceable spare parts: terminal block (1746-RT25G), terminal cover (1746-R13), user manual (1746-6.8).

Maintenance taboos: Do not disassemble the module by yourself, and return it to the manufacturer for repair in case of malfunction; Only use dry anti-static cloth for cleaning, and do not use cleaning agents.

（5） Application example: Practical scenario reference

Basic Example: Current Value Display

Requirement: Collect single-phase motor current (4-20mA transmitter) and display the current value on an LED display (BCD format).

Configuration: Channel 0 is set to 4-20mA, engineering unit, 10Hz filtering, open circuit output 0; Scale 3500-20500 (data word range) to 0-100 (current range) using SCP command, convert TOD command to BCD and send it to the display.

Supplementary example: Multi parameter monitoring

Requirement: Monitor the three-phase motor current (L1-L3), tank pressure, and liquid level, switch the display through a selection switch, and trigger an alarm for low/high liquid level.

Configuration: Channel 0-2 (4-20mA, current), Channel 3 (4-20mA, pressure), Channel 4 (0-10V DC, liquid level); The ladder program includes scaling, BCD conversion, and alarm logic (trigger light for liquid level<12 inches or>110 inches).

Technical specifications and appendix supplements

Core specifications

Electrical parameters: A/D conversion to successive approximation type, common mode rejection ratio (CMRR) ≥ 75dB at DC and ≥ 100dB at 50/60Hz, channel update time 0.75m/s channel, total module update time 6ms (8-channel enabled).

Physical parameters: Size 56.6 × 12.1 × 77.5mm (2.23 × 0.48 × 3.05 inches), weight 30.9g (1.09 ounces), terminal supports 2 channels of 14 AWG wires.

Appendix Resources

Appendix A: Complete Electrical/Environmental/Physical Specification Table.

Appendix B: Channel Configuration Worksheet (including bit definition and setting examples).

Appendix C: ID code, address, and configuration word adaptation method for migrating from 1746-NI4 (4-channel) to 1746-NI8.

Appendix D: Binary Supplement Explanation (Explaining SLC Processor Data Storage Format).

Key precautions

Compatibility check: The compatibility of module combinations (refer to Table 3-2 in the manual) needs to be confirmed for the 2-slot expansion chassis (1746-A2), and some combinations require external power supply; The programming software needs to support Class 3 mode (such as RSLogix 500 V1.30+).

Anti interference measures: The distance between the analog line and the power line should be ≥ 15cm, shielded twisted pair cables should be used, and the shielding layer should be grounded at one end; Choose an appropriate filtering frequency (such as 10Hz filtering in a 60Hz environment) to reduce power frequency noise.

Safety regulations: Installation/disassembly/wiring must be powered off, hazardous environments (such as Class I Zone 2) must meet explosion-proof requirements, module grounding relies on DIN rails (recommended galvanized steel rails), fixed every 200mm.

Core framework and scope of application

The document follows the logical mainline of “safety regulations → installation process → wiring guidance → technical parameters”, covering the entire process of module preparation to deployment. The applicable products are two types of terminal modules in the 1734 series:

Common Terminal Module (1734-CTM/CTMK): Used to expand the common terminal wiring capability of POINT I/O modules, supporting centralized management of common lines for 8-channel high-density I/O modules. The suffix “K” is the conformal coating version (moisture-proof/corrosive environment), with specifications consistent with the uncoated version.

Voltage Terminal Module (1734-VTM/VTMK): Provides voltage output terminals to distribute power to field devices such as sensors and actuators, and also supports 8-channel configuration. The “K” version is a conformal coating version.

Applicable scenarios: In industrial automation control systems, it is used in conjunction with 1734 series POINT I/O modules (such as digital input/output modules, analog modules) to solve terminal expansion and power distribution problems in high-density wiring scenarios. It is compatible with 1734-TB/TBS (two-piece terminal base) and 1734-TOP/TOPS (one-piece terminal base), but not compatible with 1734-TB3/TB3S and 1734-TOP3/TOP3S bases.

Core content sorting

（1） Preparation in advance: Safety regulations and environmental requirements

Safety prerequisite

Operation qualification: Installation, wiring, and maintenance must be carried out by trained professionals and comply with local electrical regulations (such as NFPA 70E, EN/IEC standards).

Static electricity protection: The module is sensitive to static electricity. When operating, it is necessary to touch a grounded object to discharge and wear a grounding wristband. It is forbidden to touch the pins or components of the circuit board. When idle, it should be stored in anti-static packaging.

Attention to hazardous environments: If used in Class I, Zone 2 hazardous areas, it must be installed in a compliant enclosure and the wiring method must meet local explosion-proof standards; When replacing modules or terminals, power off or ensure that the environment is not hazardous.

Environmental and shell requirements

Environmental level: Suitable for industrial environments with pollution level 2, overvoltage category II (EN/IEC 60664-1), altitude up to 2000 meters (no need to downgrade), prohibited for residential environments.

Shell requirements: The module is of open design and needs to be installed inside a closed shell. The shell should have flame retardant properties (flame propagation level 5VA or non-metallic materials need to be certified), and the interior can only be accessed through tools. The protection level should refer to NEMA 250 or EN/IEC 60529 standards (such as dustproof and waterproof requirements).

Temperature range: Operating temperature -20 ° C~+55 ° C (-4 ° F~+131 ° F), non operating temperature -40 ° C~+85 ° C (-40 ° F~+185 ° F). Exceeding this range can cause module failure.

（2） Installation process: Base, module, and terminal block deployment

1. Install the terminal base (Mounting Base)

The module needs to be installed on a DIN rail through a 1734-TB/TBS or 1734-TOP/TOPS terminal base (recommended Allen Bradley 199-DR1 rail, compliant with EN 50022 standard). The steps are as follows:

Rail grounding confirmation: Use galvanized chromate passivated steel rails (aluminum/plastic rails are prone to oxidation or poor conductivity, which can cause grounding abnormalities), fix the rails every 200mm (7.8 inches), and install end anchors at both ends. Grounding must comply with the Industrial Automation Wiring and Grounding Guidelines (1770-4.1).

Positioning and installation of the base: Align the base vertically with the installed equipment (adapter, power supply, or existing module), slide down to engage the side interlocking structure with adjacent equipment, and press until the buckle is locked; Confirm that the orange DIN rail locking screw is in a horizontal position (unlocked) to prevent the base from loosening.

End cap protection: The end cap of the terminal base should be covered with an adapter or interface module to prevent electric shock or equipment damage to the exposed interconnected parts.

2. Install terminal module

The module can be deployed before or after installation on the base, and the key steps are as follows:

Base key switch configuration: Use a Phillips screwdriver to rotate the orange key switch on the base clockwise to align the corresponding module type number with the base groove (default position 1, refer to the module label for details), ensuring correct mechanical positioning.

Module installation: Insert the module vertically into the base and press it until the locking buckle is engaged; If the base is powered on, inserting/removing the module may generate an arc. In hazardous environments, power should be cut off first to avoid explosions caused by the arc.

3. Install Removable Terminal Block (RTB)

Module matching 1734-RTB (detachable terminal block), supports wire free replacement of base, installation steps:

Terminal block positioning: Insert the RTB handleless end (with arc-shaped buckle) into the base and rotate it to lock (hear a “click” sound).

Handle fixation: If the I/O module has been installed, fasten the RTB handle onto the module to ensure that the terminal block is stable; When disassembling, simply pull the handle upwards without removing the wiring.

Special terminal block operation:

1734-RTBS/RTB3S: Use a 3mm diameter screwdriver (1492-N90) to insert into the opening at a 73 ° angle and gently push up to lock/unlock the wiring.

1734-TOPS/TOP3S: Insert the screwdriver into the opening at a 97 ° angle to avoid damaging the terminals.

（3） Wiring guidance: Terminal definition and typical scenarios

The module needs to be used in conjunction with POINT I/O modules, and the wiring needs to be disconnected first. The key specifications are as follows:

1. Terminal definition

1734-CTM (Common Terminal Module): The terminals are divided into “Common 0-7”, corresponding to the common end of the 8-channel I/O module (such as the power common line of the digital module), which centrally manages the common line and reduces wiring redundancy.

1734-VTM (Voltage Terminal Module): The terminals are divided into “Voltage out 0~7” (voltage output) and “Common 0~7” (common terminal), providing power distribution for on-site equipment. The output voltage needs to be matched with an external power source (10~28.8V DC or 120/240V AC).

2. Typical wiring scenarios

The document provides wiring diagrams for four core scenarios (Figures 4 to 7), with key examples as follows:

Leakage type input wiring (1734-IB8 module+CTM/VTM): The “signal terminal” of the 2-wire/3-wire proximity sensor is connected to the input terminal of the I/O module, the “power terminal” is connected to the “Voltage out” of the VTM, and the “common terminal” is connected to the “Common” of the CTM, achieving separate management of power and common terminals.

Source type output wiring (1734-OB8 module+CTM): The “positive pole” of the actuator (such as indicator lights, relays) is connected to the output terminal of the I/O module, and the “negative pole” is centrally connected to the “Common” of the CTM, simplifying multi device common terminal wiring.

Universal wiring (adapter+CTM/VTM): VTM connects to an external power source to distribute voltage to other devices; CTM connects to the adapter’s common end, achieving the aggregation of multiple module common lines and avoiding duplicate wiring.

3. Wiring parameters

Wire specifications: Supports solid or stranded copper wire of 0.25~2.5mm ² (22~14 AWG), with a maximum insulation thickness of 1.2mm (3/64 inches), and a rated temperature of ≥ 75 ° C (167 ° F).

Terminal torque: The tightening torque of the base screw is 0.8 N · m (7 lb · in), excessive tightening can damage the terminal.

（4） Technical parameters: Electrical and environmental specifications

1. General parameters

Parameter values

No indicator light

Key switch position 5

Adaptation base 1734-TB/TBS, 1734-TOP/TOPS

POINT Bus maximum current none

Maximum power consumption/heat dissipation none (only terminal expansion, no active components)

Isolation voltage 250V AC (continuous), 1600V DC (60 second test, on-site system side)

On site power bus voltage 10~28.8V DC, 120/240V AC

The maximum output current of the on-site power bus is 2A per point and 4A per module

The dimensions (height x width x depth) are approximately 56.6 x 12.1 x 77.5mm (2.23 x 0.48 x 3.05 inches)

Weight approximately 30.9g (1.09 ounces)

2. Environmental parameters

Parameter standards and numerical values

Working temperature -20 ° C~+55 ° C (-4 ° F~+131 ° F), in accordance with IEC 60068-2-1/2/14

Non working temperature -40 ° C~+85 ° C (-40 ° F~+185 ° F), in accordance with IEC 60068-2-1/2/14

Relative humidity of 5%~95% (non condensing), in accordance with IEC 60068-2-30

Vibration (working) 5g @ 10~500Hz, in accordance with IEC 60068-2-6

Impact (working) 30g, compliant with IEC 60068-2-27

50g impact (non working), in accordance with IEC 60068-2-27

3. Authentication information

C-UL-US certification: UL listed industrial control equipment, suitable for the United States and Canada; Certification for Class I Zone 2 (Groups A/B/C/D) Hazardous Areas (UL Document E194810).

UK and CE certification: VTM/VTMK complies with UK Regulation 1101 of 2016 and EU EMC Directive 2014/35/EU (EN 61131-2); All modules comply with the EU 2011/65/EU RoHS Directive (EN IEC 63000).

Moroccan certification: VTM/VTMK complies with Moroccan Ministerial Decree No. 6404-15.

（5） Module dismantling and maintenance

Dismantling process: The module, adjacent module on the right side, and RTB (if wired) need to be dismantled first. The steps are:

Disconnect the RTB handle buckle and pull out the RTB;

Press the lock button on the top of the module and pull out the module;

Use a Phillips screwdriver to rotate the orange base locking screw to a vertical position, release the locking mechanism, and lift the base upwards to complete the removal.

Maintenance precautions: Do not disassemble the module by yourself in case of a malfunction and return it to the manufacturer for repair; When cleaning, only dry anti-static cloth can be used for wiping, and the use of cleaning agents is prohibited.

Core framework and scope of application

The document is divided into 10 core chapters and 4 appendices, with a clear and progressive structure based on the logic of “operation process+technical details”. The applicable product is SMC Dialog Plus controller (Bulletin 150), which supports rated current of 1-1000A, voltage of 200-480V AC or 200-600V AC, and frequency of 50/60Hz. It can control three-phase squirrel cage motors and is suitable for various scenarios such as motor starting, speed regulation, braking, etc. in the industrial field, such as motor control of pumps, fans, compressors, conveyor belts and other equipment.

Core chapter content sorting

（1） Product Overview: Functions and Core Features

Startup mode: Provides 4 standard startup modes to meet different load requirements

Soft Start: The initial torque (0-90% locked rotor torque) and acceleration ramp time (0-30 seconds) can be adjusted, and the motor automatically switches to full pressure operation after reaching rated speed, suitable for general loads.

Current Limit Start: Limit the maximum starting current (50-600% of the rated motor current) for 0-30 seconds to avoid excessive starting current impacting the power grid, suitable for scenarios with limited transformer capacity.

Dual Ramp Start: Supports two independent soft start parameters (ramp time, initial torque) that can be switched and used to adapt to equipment with large load fluctuations (such as crushers and mixers).

Full Voltage Start: Output full voltage within 1/4 second, suitable for loads that require quick start-up (such as emergency backup motors).

Additional features: Optional Kickstart, providing short pulses (0.0-2.0 seconds) of 550% rated current to assist in starting high static friction loads (such as heavy-duty conveyor belts).

Protection and diagnostic functions: ensuring the safety of motors and controllers in all aspects

Overload protection: Supports overload levels of 10/15/20/30, can be manually/automatically reset, requires input of motor rated current (FLC), service factor and other parameters, monitors motor thermal utilization rate through thermal memory algorithm, and triggers protection when reaching 100%.

Fault protection: covering stalling (0.0-10.0 seconds delay), jamming (current threshold 0-999% FLC, delay 0.0-10.0 seconds), underload (0-99% FLC, delay 0-99 seconds), overvoltage/undervoltage (delay can be set based on rated voltage percentage), voltage imbalance (0-25% threshold), phase loss, SCR open circuit (shutdown after 3 failed starts), overtemperature (monitoring SCR temperature, cutting off output when exceeded), etc.

Additional features: phase balance (requires 825 converter module), energy-saving mode (reduces output voltage and losses under light load, not suitable for bypass contactor scenarios), hourly start limit (0-99 times), to avoid frequent motor overheating during startup.

Measurement and status monitoring: real-time feedback of operational data

It can monitor parameters such as three-phase voltage, three-phase current, power (kW), energy consumption (kWh), power factor (displacement power factor), motor thermal utilization rate, and operating time. Some functions (such as current measurement) require the use of an 825 converter module during bypass operation.

Control options: 6 optional functions, expanding the application scenarios of the controller

Soft Stop: The voltage ramp drops for 0-60 seconds, extending the load shutdown time and avoiding water hammer effects in pump equipment.

Pump Control: The start (0-30 seconds) and stop (0-120 seconds) times can be set to smoothly accelerate/decelerate and reduce pipeline pressure fluctuations.

Preset Slow Speed: Provides low-speed Jog function with forward 7%/15% and reverse 10%/20% rated speed, used for equipment positioning or debugging, and cannot operate for a long time (due to insufficient motor heat dissipation).

Intelligent Motor Braking (SMB): No additional equipment is required, apply a braking current of 0-400% FLC, automatically cut off at zero speed, and shorten downtime (such as elevators and centrifuges).

Accu Stop: Combining SMB braking with preset low speed, brake to low speed before stopping, suitable for scenarios that require precise positioning (such as packaging machines).

Slow Speed with Braking: Braking can be triggered after low-speed braking, balancing debugging and safe shutdown.

（2） Installation: Environment and hardware requirements

Reception and Storage

Before opening the box, it is necessary to check that the product model is consistent with the order and confirm that there is no transportation damage; Long term storage should meet the requirements of temperature -20 ° C~+75 ° C, humidity 0% -95% (no condensation), and avoid corrosive environments.

Heat dissipation and casing

The controller is of an open design and needs to be installed inside a metal casing. The temperature inside the casing should be maintained between 0 ° C and 50 ° C. The heat dissipation power of controllers with different current levels varies (such as 110W for 24A and 2760W for 1000A), and sufficient ventilation openings should be reserved in the ventilation casing (such as 65cm ² openings for 24-54A). Some models (97A and above) come with their own cooling fans, and the fan power supply needs to be wired separately.

Installation specifications

The radiator fins need to be installed vertically, with at least 15cm of space reserved above and below to ensure air circulation; Grounding should be connected to the controller’s dedicated grounding screw/terminal post, in accordance with the IEC 5019 grounding identification standard.

（3） Wiring: Power and Control Circuit Configuration

Power wiring

The input (L1/L2/L3) is connected to the power grid, and the output (T1/T2/T3) is connected to the motor. Different current levels of terminals are compatible with different wire specifications (such as 24-54A supporting 2.5-25mm ² wires, 1000A supporting 50-240mm ² wires), and the terminals need to be tightened according to the torque specified in the manual (such as 0.8N · m for 2.5-6mm ² wires).

Suggest installing a fast current limiting fuse (such as 24A with 170M 3610-63) to protect the SCR from overcurrent damage; The power factor correction capacitor needs to be installed on the input side of the controller to avoid damage to the SCR caused by capacitor discharge.

Control wiring

The control power supply supports 100-240V AC (± 15%/± 10%) or 24V AC/DC (± 15%/± 10%), and requires separate connection to terminals 11/12. The control module has a power consumption of 40VA, and the cooling fan requires additional power supply (such as 45VA for 97A fans).

Control terminal functions: terminals 13 (enable), 16 (start), 17 (stop), 19-20 (auxiliary contacts 1&2, Form C, can be set to “normal/rated speed”), 29-30 (auxiliary contact 3, can be set to “normal/fault”), some terminals (such as 25-28) are used to connect converter modules or communication modules.

Typical wiring scheme: Provides 12 scenario wiring diagrams, including standard control, dual ramp start, bypass operation, reverse control, manual automatic (SCANPort) control, etc. If the bypass configuration requires the use of an 825 converter module to maintain current monitoring and avoid loss of protection function after controller bypass.

（4） Programming: Parameter Setting and Operation

Programming interface: Operated through the built-in 2-line 16 character backlit LCD and 4 keys (ESC/SEL/up and down arrows), the menu is divided into 4 levels (operation layer → mode layer → group layer → parameter layer), supports password protection (prevents unauthorized modification) and “search” mode (only displays non default parameters).

Core parameter group

Basic Setup: Configure startup mode, ramp time, current limit, energy-saving mode, auxiliary contact function, etc., suitable for fast startup.

Advanced Setup: includes dual ramp parameters, overvoltage/undervoltage thresholds, voltage imbalance protection, phase balance, hourly startup times, etc., suitable for complex scenarios.

Calibrate: Input the motor nameplate data (rated current, service factor, motor code, etc.), and use a true RMS clamp meter (accuracy ± 1%) to calibrate the current measurement and ensure the accuracy of the protection function.

Parameter storage: Parameters are stored in RAM by default (lost during power failure) and need to be manually saved to EEPROM (non-volatile). It supports restoring factory default values.

（5） Diagnosis and Troubleshooting: Problem Localization and Resolution

Fault display: The first row of the LCD displays the fault type (such as “OVERLOAD”), the second row displays the fault code (such as “F7”), and the fault buffer stores the last 5 fault records.

Common faults and solutions

Overload (F7): Check if the motor load is too large, if the overload level matches the motor, and if the FLC parameters are entered correctly.

Phase loss (F1-F3): Check if the power grid incoming line and motor wiring are loose, and if the fuse is blown.

SCR open circuit (F23-F25): Measure the resistance between the incoming and outgoing lines of the power module (normally>10k Ω). If there is a short circuit, replace the power module.

Communication Failure (F21): Check if the human-machine interface or communication module connected to SCANPort is disconnected, and if the Logic Mask parameter is set to 4 (enabling communication control).

Maintenance operation: When disassembling the control module, power off first, mark the wires, and then loosen the fixing screws to avoid bending the interface pins; The resistance inspection of the power module requires the use of an ohmmeter to measure the feedback resistance, gate resistance, and thermistor. If they do not meet the standards, the module needs to be replaced.

（6） Serial Communication: Remote Control and Data Interaction

Communication interface: SCANPort is standard and can be connected to 1201 human-machine interface module (programming, start stop control) or 1203 communication module (supporting protocols such as Remote I/O, DeviceNet, DH-485, etc.).

Control Enable: Parameter 85 (Logic Mask) needs to be set to 4 to enable remote control; PLC can send start stop, fault reset, option commands (such as pump stop), receive controller status (running, fault, rated speed) and metering data (current, power).

Communication example: Provide ladder diagram program examples for controllers such as SLC 500 and PLC 5, such as implementing block transfer (BTW/BTR) through Remote I/O, reading motor current, power and other parameters, or performing explicit message transmission through DeviceNet (such as reading fault codes).

Appendix and Supplementary Resources

Appendix A (Specifications): Detailed list of electrical parameters (such as insulation voltage, impulse voltage, dielectric loss tolerance), environmental parameters (altitude 2000 meters, humidity 5% -95%), and measurement accuracy (voltage ± 2%, current ± 5%).

Appendix B (Parameter Table): Summarize the numbers, units, ranges, and default values of all 88 parameters. For example, parameter 30 (Ramp Time # 1) defaults to 10 seconds and ranges from 0 to 30 seconds.

Appendix C (Replacement of Parts): Provide control module, power module SCR、 Models of spare parts such as cooling fans (such as the 24-54A standard control module 40888-490-01-S1FX).

Appendix D (Accessories): Includes accessory models and uses such as protection modules (e.g. 150-N84 for 24-54A 480V systems), terminal lugs, communication cables, converter modules (825-MCM20 compatible with 1-12.5A motors), etc.

Key precautions

Safety regulations: Installation and maintenance require power-off operation to avoid contact with live parts; Emergency stop needs to be configured separately, and functions such as soft stop and SMB braking cannot replace emergency stop, in compliance with NFPA 70E and other standards.

Selection and adaptation: Select the controller model and functional options based on the rated current of the motor, load type (such as pump control options), and starting mode requirements to avoid overload or insufficient functionality.

Calibration requirements: Motor data (FLC, service factor) must be accurately inputted, and current calibration must be performed when the motor is loaded at 70% or more to ensure protection function and measurement accuracy.

Core framework and scope of application

The document categorizes six types of isolation switch kits, namely 30A, 60A, 100A, 200A, 400A, and 600A, based on current levels as the core dimension. Each type is classified according to the production year/series (such as Series A, Series B, Series D, etc.), clarifying the core components, fuse clip adaptation specifications, and accessory compatibility of the kits for each period. Applicable scenarios cover circuit isolation requirements in industrial power distribution systems that require flange installation and variable depth layout. It complies with UL, CSA, NEMA, ANSI and other standards, and is compatible with NEMA 1, 3R, 4, 4X, 12 and other protection level enclosures.

Core parameters of isolation switch kits for each current level

（1） Common Basic Information

Structural design: Both are 3-pole, 600V AC specifications, divided into right-hand type (model including “DS”) and left-hand type (model including “DSX”). The left-hand type requires an additional adapter kit (such as 1495-N24, 1495-N25); Some series need to be used in conjunction with Trailer Fuse Blocks, and both must have the same series letters (such as Series A switches with Series A fuse blocks).

Fuse adaptation: Supports multiple types of fuses such as Class H, J, R, etc., and distinguishes fuse clip models based on voltage (250V AC/600V AC) (such as 1401-N series). Different current levels correspond to different fuse clip specifications to ensure matching overcurrent protection.

Accessory compatibility: The handle and connecting rod are only compatible within the same kit and cannot be interchanged across kits; Accessories such as auxiliary contacts and fuse covers should be selected according to their series to ensure proper functionality.

（2） Detailed specifications by current level

1. 30A isolation switch kit (1494V-DS30/DSX30 series)

Production Stage and Components

1975-2004 (Series A): Includes 1494V-DS30 Series A switch (left and right hands), fuse clip compatible with 1401- N41（250V Class H）、1401-N42（600V Class H&J）。

2004-2005 (Series 1): The switch remains unchanged, with the addition of 250V Class R (1401-N50) and 600V Class R (1401-N51) fuse clip adapters.

2005 (Series 2): The right-hand type is 1494V-DS30 Series B, the left-hand type is 1494V-DSX30 Series B, and the fuse clip specifications are the same as Series 1.

Since 2006 (Series 3): The switch has been upgraded to 1494V-DS30 Series D (right-hand) and 1494V-DSX30 Series D (left-hand), with accompanying trailer type fuse blocks (1494V-FS30 Series D, etc.).

Core accessories: The handle can be selected from 1494V-H1 (painted), 1494V-W1 (stainless steel), or 1494F series (plastic/painted/stainless steel); The connecting rod is divided into short styles (1494V-RA1/RA3) and long styles (1494V-RA2/RA4); The fuse cover is 1495-N56/N59/N64, etc., and the auxiliary contacts can be selected from 595-A (normally open), 595-B (normally closed), or 1495-N8/N9.

2. 60A Isolation Switch Kit (1494V-DS60/DSX60 Series)

Core difference: Upgraded fuse clip specifications, 250V Class H is 1401-N42600V Class H&J is 1401-N43250V Class R is 1401-N51600V Class R is 1401-N52; The trailer type fuse block model is the 1494V-FS60 series, and the accessory type is similar to the 30A kit, but the fuse cover has added the 1495-N66 model.

Adaptation scenario: It can carry higher current than the 30A kit and is suitable for power isolation of medium power industrial equipment such as medium-sized motors and frequency converters.

3. 100A Isolation Switch Kit (1494V-DS100/DSX100 Series)

Series Evolution: Series A from 1975-1993, Series B from 1993-2004, Series C from 2005, and Series D from 2006 to present; The fuse clips are unified as 1401-N44 (250V/600V Class H&J) and 1401-N53 (250V/600V Class R), and the matching trailer type fuse block is the 1494V-FS100 series.

Accessory features: In addition to conventional models, the auxiliary contacts require an adapter 1495-N24 for the left-hand type and 1495-N64/N65/N66 for the fuse cover, meeting the safety protection requirements in high current scenarios.

4. 200A-600A high current isolation switch kit

200A (1494V-DS200/DSX200 series): The fuse clip is 1401-N45 (Class H), 1401-N54 (Class R), and the trailer type fuse block is 1494V-FS200 series; The fuse cover is designed for both left and right hands (1495-N62/67), and the left-hand type requires an adapter 1495-N25, suitable for high-power motors and large distribution cabinets.

400A (1494V-DS400/DSX400 series): The handle has been upgraded to 1494V-H2 (painted) and 1494V-W2 (stainless steel), and two connecting rods are required in a set (1494V-RB1/RB3 short version, RB2/RB4 long version); The fuse cover is 1495-N61/63/68, and the auxiliary contacts need to be matched with adapter 595-N1 to adapt to high-power industrial systems (such as factory power distribution).

600A (1494V-DS600/DSX600 series): Supports direct bolt fixation of Class J fuses, or can be paired with independently installed fuse blocks (1491-N621/R621 series); The accessories are compatible with the 400A kit and are mainly used in high-power scenarios such as large factories and data center power isolation.

Accessory system and selection requirements

（1） Classification of core accessories

Operation category: Handle (divided into spray painted/stainless steel/plastic according to material, H1/H2, F-P1/M1/S1 series according to current level), connecting rod (divided into RA/RB series according to length and current level, multiple high current kits need to be matched).

Protection category: Fuse cover (classified by series and left and right hands into models N56/N59/N61-N68, etc., to prevent accidental contact with live parts).

Auxiliary function category: auxiliary contacts (normally open/normally closed, such as 595-A/B, 1495-N8/N9), adapters (dedicated for left-hand switches, 1495-N24/N25).

（2） Key selection rules

Series matching: The isolation switch and trailer type fuse block must have the same series letter (such as Series D switch with Series D fuse block), otherwise they cannot be assembled properly.

Current adaptation: The fuse clip, handle, and connecting rod should be selected according to the rated current of the isolation switch (for example, H2/W2 series handles are required for 400A/600A, and H1 series handles with 30A cannot be used).

Differentiation between left and right hands: Left hand switches require additional ordering of corresponding adapters, and accessories (such as fuse covers) are divided into left and right hand specific models. The installation direction needs to be clarified before selection.

Product advantages and expansion series

（1） 1494V series core advantages

Reliability: Adopting a sturdy structure and mature design, with a long service life; Compliant with multiple international standards, there is no lag in the “on/off” position during operation (snap action design), avoiding misoperation.

Security: Visible blade structure, power off status is intuitively visible; The flange structure ensures that the switch and handle are always connected (in accordance with NFPA 79 standard), and an optional fuse cover prevents accidental contact with live parts.

Flexibility: Supports multiple types of fuses, accessories can be ordered separately or purchased as a kit, suitable for different installation depths, and compatible with multiple protection levels of enclosures.

（2） Related extended product series

At the end of the document, Allen Bradley’s other isolation switch series were added for users to expand their selection as needed:

1494C series: Cable operation flange installation isolation switch (30A-400A, cable length 3 ‘-10’).

1494G series: Closed safety isolation switch (30A-600A, 2/3/6 poles, multiple shell materials and protection levels).

1494F series: Fixed depth flange mounted isolation switch (30A-200A, compatible with NEMA 1/12 enclosure).

1494D series: Fixed depth flange mounted circuit breaker operating mechanism (125A-1200A, compatible with circuit breaker frame).

Precautions for use and maintenance

Pre installation inspection: Confirm that the isolation switch series matches the fuse block and accessory model, and that the left-hand switch is equipped with the corresponding adapter.

Operation specifications: The handle and connecting rod can only be replaced within the same kit, and cannot be mixed across current levels or series to avoid mechanical failure.

Regular maintenance: Check if the fuse cover is intact and if the auxiliary contact is reliable. For high current kits (400A/600A), it is necessary to regularly check the fastening status of the connecting rod to prevent overheating and loosening.