GE DS200TCEAG1BNE TCEA Emergency Overspeed Protection Board

Description

Hardware & Electrical Specifications

‑ Manufacturer: GE General Electric ‑ Compatible System: Speedtronic Mark‑V Turbine Control ‑ Functional Acronym: TCEA (Emergency Overspeed Protection Board) ‑ On‑Board Processor: Intel 80196 microprocessor ‑ Memory: PROM modules for safety‑logic firmware storage ‑ Signal Types Handled:  • 3‑channel redundant pulse inputs from magnetic speed pickups  • Flame‑loss and discrete trip condition inputs  • Dry‑contact relay outputs for emergency turbine shutdown  • 4‑20 mA analog status output ‑ Speed Measurement Range: 0‑120 % turbine rated speed ‑ Trip Response Time: Less than 100 ms upon overspeed detection ‑ Connectors: Multi‑pin headers for speed sensors, trip outputs, power supply and system‑bus interface; standard VME P1 edge connector ‑ On‑Board Jumpers: Configurable jumpers for sensor type selection and hardware setup. All jumper positions must be exactly duplicated during replacement ‑ Indicator: Diagnostic status LED for power, communication and fault status ‑ 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. Firmware PROM revision must match site safety configuration.

Environmental Specifications

‑ Operating Temperature: 0 °C ~ +60 °C ‑ Storage Temperature: −40 °C ~ +85 °C ‑ Relative Humidity: 5%‑95 % non‑condensing ‑ Installation Environment: VME 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 VME slot installation within Mark‑V protective P‑core rack ‑ Weight: approx 0.86 kg

Core Functions

1. Redundant speed monitoring: Receives and processes three independent magnetic‑pickup speed signals to measure turbine shaft rotational speed.
2. Overspeed & flame‑out protective trip: Executes independent safety logic; triggers hard‑contact emergency‑shutdown outputs when overspeed or flame‑loss conditions are detected to prevent catastrophic turbine damage.
3. Safety‑status communication: Transmits overspeed, trip‑event and diagnostic status information to main turbine controllers over the system backplane bus.
4. Hardware configuration: Jumpers define sensor input types and safety‑related hardware parameters for site‑specific turbine requirements.
5. On‑board diagnostics: LED indicators provide visual status feedback for commissioning and troubleshooting safety‑circuit faults.

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 and verify PROM firmware revision before removing the original board. Mismatched firmware or incorrect jumper settings will disable or misconfigure turbine overspeed protection.
3. Secure VME edge connector and all external signal‑cable connections firmly; poor contact may lead to false speed readings or unwanted trip actions.
4. After power restoration, perform full safety‑loop test: verify speed‑signal readings, check trip‑relay operation and confirm diagnostic‑LED status.

5. Common failure mode: Surge interference from field speed‑pickup wiring can damage front‑end input circuits; inspect associated termination wiring when speed‑reading anomalies occur.