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Product Brief Description
The GE 369B1874G0013 Relay Expansion Terminal Board, also known as an “8480” board, is a component designed to expand the digital output capabilities of a control system, likely within the GE Mark VIe platform. It functions as an interface that allows for the connection of additional relays, which can then be used to control a variety of external, high-power devices like motors, solenoids, and contactors, all while providing electrical isolation from the low-voltage control circuitry.
Detailed Product Description
This expansion board is a specialized relay terminal board that provides a physical termination point for relay wiring. Its primary purpose is to expand the system’s output capacity and to serve as an interposing relay. This means it takes a low-power control signal from the I/O pack and uses it to switch a higher-power relay, which in turn controls an external device. This is a critical function for protecting the sensitive electronic components of the control system from high-voltage spikes and currents. While specific channel count is not detailed in the available information, it is a relay expansion board, which typically adds a set number of relay outputs to an existing digital output module.
Key Features and Specifications
- Part Number: 369B1874G0013
- Module Type: Relay Expansion Terminal Board (8480)
- Primary Function: Expands digital output capacity and provides electrical isolation.
- Role: Serves as an interposing relay between the control system and external high-power loads.
- Compatibility: Designed for use within GE’s industrial control systems, such as the Mark VIe.
- Benefits: Protects control system electronics, simplifies wiring, and enables control of high-voltage equipment.
Functional Role in a System
In a control system, the 369B1874G0013 is connected to a base digital output module. The control module sends a low-voltage signal to this expansion board. The board then energizes a relay, which acts as a switch for the higher-voltage circuit of a field device. For example, a 24 VDC signal from the controller could activate a relay on this board, which then switches a 120 VAC or 230 VAC circuit to turn on a motor. This separation of control and power circuits is a fundamental safety and reliability feature in industrial automation.
Common Applications
The relay expansion terminal board is widely used in applications where a control system needs to interface with a large number of high-power devices, including:
- Motor Control Centers: Switching motor starters and contactors.
- Process Automation: Activating solenoids for valves or other actuators.
- Equipment Safety: Controlling emergency shutdown sequences by switching off high-voltage circuits.
- Alarm and Annunciation: Activating high-power sirens, lights, and other signaling devices.
