GE DS200TBQDG1AFF TBQD RST Extended Analog Termination Board

Description

Hardware & Electrical Specifications

‑ Manufacturer: GE General Electric ‑ Compatible System: Speedtronic Mark‑V Turbine Control ‑ Functional Acronym: TBQD (RST Extended Analog Termination Board) ‑ Signal Types Handled:  • Auxiliary 4‑20 mA analog current loop inputs from field transmitters  • LVDT/R position feedback signals  • Extended analog milliamp output signals ‑ Terminal Blocks: 2 screw‑type high‑density terminal blocks for field wiring connection ‑ Inter‑Board Connectors: 3 ×34‑pin ribbon‑cable headers for connection to core controller boards ‑ On‑Board Jumpers: Configurable Berg‑style jumpers for signal routing and channel assignment. All jumper positions must be exactly duplicated during replacement ‑ Protection Circuitry: TVS diodes and clamping capacitors for surge and transient suppression on field signal lines ‑ Power Source: Receives bias power from controller 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 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 286 mm × 76 mm ‑ Mounting: Four‑corner screw mounting holes for direct cabinet back‑plate installation ‑ Weight: approx 0.30 kg

Core Functions

1. Extended field‑signal termination: Provides additional screw terminals to expand analog I/O capacity together with TBQC termination board for field transmitters and LVDT/R position sensors.
2. Transient surge protection: On‑board suppression components absorb field‑wiring induced voltage spikes, protecting downstream controller electronics.
3. Configurable signal routing: Hardware jumpers define channel routing and signal assignment to match field device layout.
4. Signal interconnection: Multi‑pin ribbon‑cable headers transmit analog and position feedback signals between field wiring and core processing boards.
5. Test access: On‑board test points support convenient signal measurement for commissioning and on‑site 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 removal. Replacement board must replicate jumper settings 100 %; incorrect jumper configuration results in missing channels or erroneous process readings.
3. Torque all screw‑terminal connections properly; loose terminals cause unstable and noisy analog signals. Secure all ribbon‑cable connectors firmly.
4. After power restoration, perform signal loop‑check: verify analog input values, analog‑output drive levels and LVDT position feedback readings at controller side.

5. Common failure mode: Field‑wiring surges may damage onboard suppression components while leaving downstream main boards undamaged. Inspect protection components during failure assessment.