GE DS200TCEBG1ACE TCEB Protective Termination Expander Board

Description

Hardware & Electrical Specifications

‑ Manufacturer: GE General Electric ‑ Compatible System: Speedtronic Mark‑V Turbine Control ‑ Functional Acronym: TCEB (Protective Termination Expander Board) ‑ Signal Types Handled:  • Overspeed pulse signals from magnetic speed pickups  • UV flame‑detector input signals and flame‑detector 335VDC power supply output  • PT voltage transformer and CT current transformer scaled measurement signals  • Alarm drive output for local audible horn ‑ Inter‑Board Connectors: Multiple multi‑pin ribbon‑cable headers for connection to PTBA terminal board, TCEA overspeed boards and TCCB core controller ‑ On‑Board Jumpers: Configurable Berg‑style jumpers for signal routing and hardware mode selection. All jumper positions must be exactly duplicated during replacement ‑ On‑Board Device: Integrated audible alarm horn for local fault alert ‑ Power Source: Powered via system inter‑board 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 265 mm × 160 mm ‑ Mounting: Standard core rack slot mounting ‑ Weight: approx 0.75 kg

Core Functions

1. Safety‑signal conditioning & distribution: Receives overspeed, flame‑detector signals from PTBA termination board, routes conditioned signals to triple‑redundant TCEA overspeed protection boards for trip‑logic voting.
2. PT/CT signal scaling: Conditions voltage and current transformer signals for generator voltage and current measurement, sends scaled data to TCCB core control board.
3. Flame‑detector power supply: Provides regulated 335 VDC operating power for UV flame‑detector field devices.
4. Local audible alarm: Drives onboard horn to give on‑site audible alert for critical turbine protective events.
5. Signal interconnection: Multi‑pin ribbon‑cable headers realize signal transmission between field termination hardware and internal safety & control processor 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 prior to removal. Incorrect jumper settings will misroute overspeed or flame‑detector signals and compromise turbine safety protection.
3. Firmly secure all multi‑pin ribbon‑cable connectors; loose connections cause intermittent loss of critical protective signals.
4. After power restoration, perform full signal check: verify speed‑pulse transmission, flame‑detector power output, PT/CT measurement values and alarm‑horn operation.

5. Common failure mode: Transient surges from field wiring may damage signal‑conditioning circuits, resulting in missing safety signals to downstream TCEA protection boards.