GE DS200TCTGG1AFF TCTG Simplex Turbine Trip Board

Description

Hardware & Electrical Specifications

‑ Manufacturer: GE General Electric ‑ Compatible System: Speedtronic Mark‑V Turbine Control ‑ Functional Acronym: TCTG (Simplex Turbine Trip Board) ‑ Power Supply: 24 VDC operating power ‑ On‑Board Relays: 21 plug‑gable safety relays for trip‑output and signal‑interlock circuits ‑ Connectors: 3 ×50‑pin ribbon‑cable headers, 2 ×12‑pin inter‑board connectors for core‑signal and solenoid‑wiring interface ‑ On‑Board Jumpers: Configurable jumpers for trip‑logic hardware setup. All jumper positions must be exactly duplicated during replacement ‑ Indicators: LED status indicators for relay and trip‑circuit diagnostic monitoring ‑ PCB Finish: Conformal coated multilayer FR‑4 PCB ‑ Compatibility Restriction: Works only for Mark‑V systems; not compatible with Mark‑VI / Mark‑VIe control racks. Relay part numbers must match original specifications.

Environmental Specifications

‑ Operating Temperature: 0 °C ~ +60 °C ‑ Storage Temperature: −40 °C ~ +85 °C ‑ Relative Humidity: 5%‑95 % non‑condensing ‑ Installation Environment: Control cabinet interior, Pollution Degree 2 ‑ EMC: Designed for power‑plant cabinet EMI and switching‑transient conditions

Mechanical Data

‑ Physical Dimension: approx 259 mm × 201 mm ‑ Mounting: Standard slot installation inside Mark‑V protective rack ‑ Weight: approx 2.27 kg

Core Functions

1. Hardware emergency trip execution: Receives trip‑voting commands from triple‑redundant control cores and hard‑wired field emergency‑stop inputs, energizes / de‑energizes trip solenoids to shut off fuel and steam supply for turbine protection.
2. Field trip‑signal interface: Processes discrete hard‑wired trip signals including local emergency stop, cabinet fault and other safety interlock conditions.
3. Modular relay design: 21 plug‑in relays allow individual relay replacement without removing the complete board, improving maintenance efficiency.
4. Self‑diagnosis & status indication: Built‑in self‑test monitors relay and circuit health; LED indicators give visual status for commissioning and troubleshooting safety faults.
5. Signal interconnection: Multi‑pin ribbon‑cable headers exchange trip‑request and diagnostic status between TCTG and R/S/T core control boards.

Installation, Replacement & Critical Warnings

1. Complete system power‑down and lock‑out procedure required before servicing. Non‑hot‑swappable. ESD wrist‑strap protection is mandatory when handling the PCB assembly.
2. Record all original jumper positions and verify relay part numbers before replacement. Mismatched relays or incorrect jumper settings may result in unintended turbine trip or complete loss of shutdown protection.
3. Secure all ribbon‑cable and field‑solenoid wiring connections firmly; loose connections can cause spurious trip events or failure to execute emergency shutdown.
4. After power restoration, perform full safety‑loop test: simulate trip conditions, verify relay action, solenoid drive response and LED diagnostic status.

5. Common failure mode: Relay contact wear is the dominant failure mode; surge from solenoid coils may also damage on‑board circuits. Inspect relay contacts during routine overhaul.