The GE IS200WROBH1AAA (functionally known as the WROB board) is a Relay Option Board manufactured by General Electric for the Speedtronic Mark VI turbine control system.
The WROB board provides electromechanical relay outputs for driving heavy solenoid valves, motor starters, alarm annunciators, and trip solenoid loops in gas and steam turbine power plants. It operates in conjunction with Mark VI VME-bus control racks and terminal boards (such as the TREF or TRLY series).
Technical Specifications
| Parameter | Specification |
| Manufacturer | General Electric (GE Power / GE Vernova) |
| System Platform | Speedtronic Mark VI Turbine Control System |
| Part / Revision Number | IS200WROBH1AAA (Functional revision H1AAA) |
| Functional Acronym | WROB (Relay Option Board) |
| Number of Relays | Onboard electromechanical relay channels |
| Relay Contact Rating | 120 V AC / 24 V DC high-capacity switching contacts |
| Power Supply Input | 24 V DC (Power distributed via terminal board connector) |
| Operating Temperature | -30°C to +65°C (-22°F to +149°F) |
| Form Factor | Mark VI Rack / Subrack Option Board Assembly |
Core Features & System Capabilities
- High-Capacity Switching: Equipped with sealed electromechanical relays rated to drive inductive field loads, including heavy-duty solenoid valves and auxiliary power contactors.
- Optical & Galvanic Isolation: Provides electrical isolation between sensitive low-voltage Mark VI backplane logic and high-voltage field contact circuits.
- Failsafe Contact Configuration: Relay channels support configurable Form-C (Normally Open / Normally Closed) contact states for predictable operation during control power loss.
- Onboard Diagnostic Feedback: Built-in status feedback loops continuously verify relay coil drive current and contact closure states to signal coil failures or stuck contacts to the main controller.
- Direct Cable Interface: Plugs into standard Mark VI terminal boards via multi-pin ribbon/cable headers, maintaining organized panel wiring inside control cabinets.
Related GE Speedtronic Mark VI Components
- IS200TRLYH1B / IS200TRLYH1C — Relay Terminal Boards for Mark VI cabinet field wiring.
- IS200VCMOH1B — Discrete / Analog I/O VME Controller Board.
- IS200VSVOH1B — Servo Control Module for turbine valve positioning.
- IS220PDIOH1B — Mark VIe Discrete I/O Pack (next-generation equivalent).
