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The GE IS200DRLYH1A is a Simplex Relay Output Terminal Board (functional acronym DRLY) manufactured by General Electric (GE) for the Mark VI Speedtronic Turbine Control System.
Its primary function is to serve as the physical interface for output signals that require switching power external to the main control rack.
⚙️ Key Functions and Characteristics
The IS200DRLYH1A board converts low-voltage digital commands from the control system into high-power relay switching actions for field devices.
- Relay Output Interface: It provides 12 Form-C dry contact output relays. These relays allow the Mark VI control system to safely switch external AC or DC power to field devices (like solenoid valves, indication lights, or auxiliary motor starters) without the external voltage/current physically entering the delicate control rack electronics.
- Dry Contacts: The relays feature dry contacts, meaning they provide an isolated switch closure without supplying power from the board itself. The power for the switched load must be supplied externally by the customer.
- Simplex Configuration: The board is designed for simplex applications only (meaning it is not used in Triple Modular Redundant or TMR setups). It connects to a single processor board, such as the VCCC or VCRC board, using a single cable.
- Higher Powered Contacts: The H1A version is specifically noted for having higher powered relay contacts compared to the H1B version.
- Physical Design:
- It features terminal blocks for connecting the field wiring.
- It is designed for wall mounting (not DIN-rail mounting).
- The board is built for reliability and simplicity and does not contain any jumpers, fuses, or configurable hardware.
- Indicators: It includes LEDs: a single green LED to indicate that $28 \text{ V}_{\text{DC}}$ power is supplied to the relay coils from the I/O pack, and yellow LEDs on each relay to show when the coil is energized (voltage across the coil).
