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GE IS200TBQGH1A

Product Name:​ TGE (Terminal Board Gas Excitation) I/O Termination Board
Product Overview:​ The IS200TBQGH1A is the TGE variant—Terminal Board Gas Excitation. It handles the critical interface between the Mark VIe controller and the turbine’s excitation field circuitry. Unlike its TBQD cousin (which leans toward steam applications), the TGE board has a distinct I/O mapping that accounts for gas turbine start-up sequencing and flame detection interlock signals.
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Technical Specifications:
  • Manufacturer: General Electric (GE)
  • Part Number: IS200TBQGH1A
  • Series: Mark VIe Speedtronic
  • Function: TGE Termination Board (Gas Excitation)
  • Nominal Voltage: 24V DC
  • Output Current (per channel): 1.5A (maximum)
  • I/O Type: Discrete inputs and high-side outputs
  • Connector Type: 37-pin D-sub (x2) and terminal blocks
  • Mounting: DIN-rail or chassis mount
  • Operating Temp: 0 to 60°C (ambient)
  • Relative Humidity: 5% to 95% (non-condensing)
  • Compatible Rack: Mark VIe IS200 series backplane
  • Application: Gas turbine excitation and protection
Functional Features:
  • Handles the critical interface between the Mark VIe controller and the turbine’s excitation field circuitry
  • Translates logic-level commands into the DC drive signals that keep the generator synced
  • The ‘H1A’ revision adds a ferrite bead on the 24V return line for noise suppression
  • Measured 15% improvement in noise immunity on the 24V return paths compared to the original IS200TBQGH1
  • TGE-specific I/O mapping accounts for gas turbine start-up sequencing and flame detection interlock signals
Working Principle:​ The board sits between the Mark VIe controller and the turbine’s excitation field, translating logic-level commands into the DC drive signals for gas turbine excitation and protection.
Application Scenarios:​ Gas turbine excitation and protection in GE gas turbine fleets. Compatible with GE Frame 9E turbine provided the control system is Mark VIe.
Compatible Replacement Models:
  • Drop-in Replacement:​ IS200TBQGH1 — The base revision without the ‘A’ suffix. Identical pinout and mounting
  • Software Compatible:​ IS200TBQDH1A — Steam turbine equivalent. Hardware form factor is identical, but I/O channel mapping is different. Requires remapping the point database in Mark VIe Toolbox and recompiling. Estimate 4-6 hours of engineering time plus full FAT cycle
  • Hardware Incompatible:​ IS200TBAI (any suffix) — General-purpose analog I/O board with completely different pinout arrangement
Important Notes:
  • This board expects a specific firmware handshake from the VME controller. Plug it into a steam application backplane and you’ll get comms errors within the first scan cycle
  • After swapping with IS200TBQGH1, a comms loop test is recommended to confirm signal integrity
  • The TGE board has a distinct I/O mapping that differs from TBQD (steam) variants

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