Quick Sizing & Sourcing Snapshot
- Manufacturer: GE (General Electric)
- Part Number: IS200ECTBG1A
- System Platform: EX2100 / EX2100e Excitation Control (Mark VI)
- Hardware Type: Exciter Contact Terminal Board (ECTB)
- Architectural Role: Provides the physical field termination for redundant trip relays and wet contact inputs, interfacing the M1, M2, and C controllers via the EMIO board.
- Key Specifications: 2 Trip Relays (Lockout), 4 Gen-C Relays, 70V DC Wetting, Redundant Mode Only.
System Architecture & Operational Principle
The IS200ECTBG1A is a passive terminal board mounted in the EX2100 Exciter Cabinet, specifically designated for Redundant (TMR) architectures. It serves as the field-facing I/O hub for critical contact signals, bridging the gap between the turbine deck and the VME controllers.
Physically, it mounts to the cabinet frame. Upstream, it connects to the EMIO (Exciter Master I/O) boards in the M1, M2, and C cores via three 25-pin D-Sub connectors (J405, J408, J415). Downstream, it handles the heavy lifting: it terminates six auxiliary contact inputs (powered/wetted by an isolated 70V DC supply from the EPSM) and hosts two heavy-duty Trip Relays (K1, K2) typically used to drive customer lockout circuits or interface with the turbine’s TRLY (Trip Relay) boards. It also provides four General Purpose Form-C relays (K1GP-K4GP) controlled by the EMIO for auxiliary sequencing (e.g., field flashing, cubicle cooling). In a TMR setup, this board is replicated across the M1, M2, and C cores, ensuring that a wiring fault on the ‘M1’ physical terminal doesn’t disable the ‘M2’ or ‘C’ protection paths.
Core Technical Specifications
- Operation Mode: Redundant Only (G1 Suffix denotes Redundant; G2 is Simplex)
- Trip Outputs: 2x Form-C Relays (K1, K2), Rated ~28V DC Coil Drive
- General Relays: 4x Form-C (K1GP-K4GP), Customer Wired (Typically 125V DC)
- Auxiliary Inputs: 6x 70V DC Wet (Sourced from J13M1/J13M2 plugs)
- Monitored Inputs: 52G (Gen Breaker), 86G (Lockout) – 70V Wet
- Controller Links: 3x 25-pin D-Sub (J405->M1, J408->M2, J415->C)
- Power Interface: J13M1, J13M2 (70V DC from M1/M2 Power Supplies)
- Terminals: TB1, TB2 (Barrier Strips for Field Wiring)
- Isolation: 500 V DC Channel-to-Earth (Relay Contacts)
- Indicators: Red LEDs per Input (State Indication), Relay Status (Implicit)
- Mounting: Chassis Mount (Exciter Cabinet)
- Environmental: -40°C to +85°C (Operational)
