The GE IS200WROBH1A is a Relay Output (WROB) board designed for the Mark VI Speedtronic control system. This “Relay Power Sensory Plate” provides the physical interface for discrete output signals, utilizing heavy-duty relays to drive external solenoid valves, motor starters, and annunciators. The “H1ABA” revision represents an updated hardware assembly with enhanced sensory feedback circuits for monitoring the health and state of the relay contacts in real-time.
Product Parameters
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Relay Channels: 12 or 24 independent relay outputs (configuration dependent)
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Contact Rating: 125V DC @ 2A (Inductive) / 10A (Resistive)
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Feedback Sensing: Integrated voltage and continuity sensing for each contact
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Response Time: <10ms for typical coil energization
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Power Consumption: Low-power CMOS logic interface with high-current relay coils
Product Specifications
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Series: Mark VI Turbine Control
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Component Type: Relay Output Board (WROB)
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Revision Level: H1A / H1ABA
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Isolation: Optical isolation between control logic and field power
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Connection: High-density plug-in headers for the VME rack or terminal base
Application Fields
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Gas Turbine Control: Sequencing fuel nozzles and ignition transformers.
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Steam Turbine Safety: Driving emergency trip fluid solenoids.
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Generator Protection: Interfacing with lockout relays and circuit breaker trip coils.
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Balance of Plant (BOP): Managing auxiliary pumps, fans, and cooling water valves.
Product Q&A
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Q: What is the primary difference between the H1A and H1ABA versions?
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A: The H1ABA version includes refined diagnostic components that reduce false “stuck contact” alarms and improve the board’s EMI shielding.
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Q: Does this board support redundant control signals?
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A: Yes, the WROB board is typically used in TMR (Triple Modular Redundant) systems where it receives voted commands from the R, S, and T controllers.
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Q: Can the relays be replaced individually if they fail?
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A: While the relays are soldered to the PCB, they are standard industrial components; however, for critical turbine applications, replacing the entire board is recommended to maintain factory-certified reliability.
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