Description
The GE General Electric IS200EPCTG1A, full assembly number IS200EPCTG1AAA, is an Exciter PT/CT Board designed for the GE Mark VI Speedtronic turbine control and excitation control environment. The EPCT board interfaces generator potential-transformer (PT) voltage and current-transformer (CT) signals with the excitation control system. It provides two three-phase generator PT voltage inputs, two generator CT current inputs, and an additional analog input. The board includes three front-edge terminal strips, three rear vertical pin connectors identified as J315, J305, and J308, 12 test points, a jumper, two toroidal transformers, four framed transformers, resistors, capacitors, and MOV protection components.
Product Datasheet
| Specification | Details |
|---|---|
| Brand | GE General Electric |
| Model | IS200EPCTG1A |
| Full Part Number | IS200EPCTG1AAA |
| Series | Mark VI Speedtronic |
| Product Name | Exciter PT/CT Board |
| Functional Acronym | EPCT |
| Product Type | Exciter PT/CT Interface Board |
| Main Application | Generator voltage and current signal interface |
| Generator PT Inputs | 2 three-phase inputs |
| Generator CT Inputs | 2 current inputs |
| Additional Input | 1 analog input |
| Front Terminal Strips | 1 × 24-position, 2 × 4-position |
| Rear Connectors | J315, J305, J308 |
| Test Points | 12 |
| Transformers | 2 toroidal + 4 framed transformers |
| Protection Components | MOVs, resistors and capacitors |
| Mounting | Mark VI control system |
| PCB Type | Industrial printed circuit board |
| Product Status | Legacy / Obsolete |
| Condition | New |
Key Features
- GE Mark VI Speedtronic EPCT board
- Full assembly number IS200EPCTG1AAA
- Exciter PT/CT signal interface
- Two three-phase generator PT voltage inputs
- Two generator CT current inputs
- One additional analog input
- 24-position terminal strip
- Two 4-position terminal strips
- Rear connectors J315, J305 and J308
- 12 onboard test points
- Toroidal and framed signal transformers
- Jumper configuration capability
- MOV-based protection components
- Intended for compatible GE turbine excitation applications
Common Questions & Answers
Q: What is the IS200EPCTG1A?
A: It is a GE Mark VI Exciter PT/CT Board, commonly identified by the full assembly number IS200EPCTG1AAA.
Q: What does EPCT stand for?
A: EPCT identifies the Exciter PT/CT board function within the GE Mark VI excitation control architecture.
Q: What signals does the board receive?
A: The board provides two three-phase generator PT voltage inputs, two generator CT current inputs, and one additional analog input.
Q: What connectors are on the board?
A: The rear edge has three vertical pin connectors identified as J315, J305, and J308. The front edge has one 24-position terminal strip and two 4-position terminal strips.
Q: Is IS200EPCTG1A associated with excitation control?
A: Yes. The EPCT board is used in the excitation control signal path and is associated with generator PT/CT measurement within compatible Mark VI systems.
Q: What should be checked before replacement?
A: Confirm the complete part number, revision, terminal wiring, connector positions, and system configuration before installing a replacement board.
Troubleshooting & Safety
Isolate all applicable AC and DC power before removing or installing the board. Generator PT and CT circuits can involve hazardous electrical levels, so follow the plant’s lockout/tagout and electrical safety procedures.
Before installation, compare the existing board with the replacement and verify IS200EPCTG1A / IS200EPCTG1AAA identification. Inspect the terminal strips, J315/J305/J308 connectors, transformers, test points, jumper, and PCB for damage, contamination, loose connections, or corrosion. Do not change jumper positions without confirming the required configuration.
After installation, verify PT and CT wiring carefully and confirm that measured generator signals are consistent with the system configuration. Check excitation-system diagnostics and alarms before returning the equipment to normal operation.
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