GE DS200TCQCG1BKG TCQC Overflow Analog I/O Expander 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:  • Auxiliary analog input signals from field transmitters and position sensors  • High‑current analog outputs for hydraulic servo‑valve control ‑ Connectors: 3 ×40‑pin, 3 ×34‑pin, 1 ×16‑pin ribbon‑cable headers for inter‑board connection to TCCA and TBQC hardware ‑ On‑Board Jumpers: Total 24 configurable Berg‑style jumpers for signal routing, channel assignment and output‑drive mode selection. All jumper positions must be exactly duplicated during replacement ‑ Circuitry: On‑board D/A conversion and amplifier circuits for servo‑valve high‑current driving ‑ Power Source: Receives bias power from core rack backplane through multi‑pin ribbon connectors; no independent external power supply ‑ PCB Finish: Conformal coated multilayer FR‑4 PCB ‑ Compatibility Restriction: Works only for Mark‑V systems; not mechanically or electrically 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 installation within Mark‑V R/S/T triple‑redundant core rack ‑ Weight: approx 0.81 kg

Core Functions

1. Analog channel expansion: Supplements TCCA main analog board to process extra analog input signals for turbine process and position measurement.
2. Servo‑valve high‑current drive: Converts digital control commands into amplified analog current signals to operate hydraulic servo‑valves for fuel, governor and steam valve regulation.
3. Configurable signal routing: 24 hardware jumpers define channel allocation and output drive parameters to match site actuator configuration.
4. Inter‑board signal transmission: Multi‑pin ribbon‑cable headers exchange analog signals between TCQC, TCCA controller board and TBQC field termination boards.
5. Test access: On‑board test points support convenient signal measurement during commissioning and field 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 before removing the original board. Improper jumper settings result in servo‑valve mis‑operation, missing analog channels or wrong process readings.
3. Fasten all ribbon‑cable connectors securely; poor contact leads to intermittent control output and unstable valve action.
4. After power restoration, perform full loop‑check: verify analog input readings, measure servo‑valve drive current outputs and confirm overall signal performance.

5. Common failure mode: Field‑wiring surge can damage output amplifier circuits on TCQC. Inspect corresponding TBQC termination boards when abnormal control behaviour occurs.