Function: Executes speed governor, load divider, sequencing, fuel/steam valve positioning

Inputs: Magnetic pickup speed, LVDT valve feedback, analog process

Outputs: Servo driver signals to hydraulic/electro-hydraulic actuators

Comms: Mark V coax/Genius bus to peer cards (TBCB, TCTG, etc.)

Power: From DS200 DCFB power board (5 V / ±15 V)

Operating Temp: –30 °C to +65 °C typical industrial

Functional Features: Hardware watchdog, triple-modular-redundant (TMR) capable when three cards voted.

Working Principle: Reads turbine speed via MPU, compares to speed setpoint, computes fuel demand through droop/isochronous algorithm, outputs corrected servo current.

Application: GE 7FA, 9E, LM6000 and similar turbine controls.

Installation & Notes: Install in Mark V <R1>/<R2>/<R3> slots; calibrate speed loop after replacement; backup EEPROM parameters before swap.