GE DS200TCQCG1BGF TCQC Overflow Analog I/O Board

Description

Hardware & Electrical Specifications

‑ Manufacturer: GE General Electric ‑ Compatible System: Speedtronic Mark‑V Turbine Control ‑ Functional Acronym: TCQC (Overflow Analog I/O Expander Board) ‑ Signal Types Handled:  • Extended analog input signals from field process transmitters and position sensors  • High‑current analog output signals for servo‑valve actuation ‑ Connectors: 3 ×40‑pin, 3 ×34‑pin, 1 ×16‑pin ribbon‑cable headers for inter‑board connection ‑ On‑Board Jumpers: Total 24 configurable Berg‑style jumpers for signal routing, output‑mode selection and channel assignment. All jumper positions must be exactly duplicated during replacement ‑ Circuitry: On‑board D/A converters and amplifier circuits for servo‑valve current drive ‑ Power Source: Receives operating power from core controller backplane via multi‑pin ribbon connectors ‑ 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.

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 260 mm × 165 mm ‑ Mounting: Standard slot mounting within Mark‑V R/S/T core rack ‑ Weight: approx 0.80 kg

Core Functions

1. Analog I/O capacity expansion: Acts as overflow expander to supplement TCCA analog board, processing extra field analog input signals for turbine process measurement.
2. Servo‑valve drive output: Converts digital commands from core controllers into amplified high‑current analog signals to position hydraulic servo‑valves for fuel and steam control loops.
3. Configurable signal routing: 24 hardware jumpers define channel assignment and output drive modes to match field actuator hardware requirements.
4. Inter‑board signal transmission: Multi‑pin ribbon‑cable headers exchange analog data between TCQC board, TCCA main analog board and downstream TBQC termination hardware.
5. Test access: On‑board test points support signal measurement for commissioning and on‑site fault troubleshooting.

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 prior to board removal. Wrong jumper configuration results in servo‑valve mis‑actuation, lost analog channels or erroneous turbine process values.
3. Secure all multi‑pin ribbon‑cable connectors firmly; loose connections produce intermittent control outputs and unstable servo‑valve behavior.
4. After power restoration, perform full loop‑check: verify overflow analog input values, measure servo‑valve drive current outputs and confirm signal integrity.

5. Common failure mode: Field‑side surge events can damage output amplifier circuits on this board, leading to servo‑valve control failure; inspect corresponding termination boards when faults occur.