GE DS200TBQCG1AAA TBQC Analog Milliamp I/O Termination Board

Description

Hardware & Electrical Specifications

‑ Manufacturer: GE General Electric ‑ Compatible System: Speedtronic Mark‑V Turbine Control, EX2000 Excitation System ‑ Functional Acronym: TBQC (RST Analog Termination Board) ‑ Signal Types Handled:  • 4‑20 mA / 0‑20 mA analog current loop inputs from field transmitters (pressure, flow, temperature)  • LVDT/R position feedback signals  • Analog current outputs configurable for 20 mA maximum or 200 mA maximum via hardware jumpers ‑ Terminal Blocks: 2 screw‑type terminal blocks (TB1, TB2), 83 terminals per block, total 166 field‑wiring connection points ‑ Inter‑Board Connectors: 3 ×40‑pin, 3 ×34‑pin ribbon‑cable headers for connection to TCQA core boards ‑ On‑Board Jumpers: Total 15 configurable Berg‑style jumpers; key jumper groups include JBR, JFR, JBS/T, JFS/T, TEST. Jumpers select output‑current limit mode, signal routing and channel assignment. All jumper positions must be exactly duplicated during replacement ‑ Protection Circuitry: TVS diodes, clamping capacitors and transient‑suppression components for surge and noise protection on field signal lines ‑ Power Source: Receives operating bias power from TCQA boards 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 / EX2000. 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, motor‑noise and switching‑transient conditions

Mechanical Data

‑ Physical Dimension: 286 mm × 76 mm (11.25 inch ×3 inch) ‑ Mounting: Four‑corner screw mounting holes for direct cabinet back‑plate installation ‑ Weight: approx 0.32 kg

Core Functions

1. Field‑signal termination: High‑density screw terminals terminate field wiring for 4‑20 mA transmitters and LVDT/R position sensors. Standard twisted‑shield field cables land on TB1 and TB2 terminal blocks.
2. Transient surge protection: On‑board suppression components absorb lightning‑induction and field‑wiring fault transients, isolating and protecting the downstream TCQA controller electronics.
3. Configurable signal routing: 15 hardware jumpers define channel routing, select analog‑output maximum current limit (20 mA / 200 mA mode), match field device hardware requirements.
4. Signal cross‑connect between field and core controller: Multi‑pin ribbon‑cable headers pass analog milliamp and LVDT/R signals back‑and‑forth between TBQC and each core’s TCQA processing board.
5. Test access: Dedicated TEST connector provides convenient test‑point access for field technicians for signal measurement during commissioning and 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. Before removing the original TBQC board, record every single jumper position. The replacement board must replicate jumper settings 100 %; incorrect jumper configuration causes wrong output‑current range, lost analog channels, or erroneous turbine‑process measurements.
3. Secure all screw‑terminal connections to proper torque; loose field‑wiring terminals produce drifting, noisy analog readings. Tighten all 34‑pin and 40‑pin ribbon‑cable connectors.
4. After power restoration, perform loop‑check verification: validate 4‑20 mA input values at HMI, verify analog‑output drive levels, and confirm LVDT/R position feedback readings.

5. Common failure mode: Surge damage originating from field‑wiring faults can blow suppression components on TBQC, while leaving the downstream TCQA board unharmed. Always inspect TVS and capacitor components during repair assessment.