The GE IS200EPCTG1A, also cataloged as the IS200EPCTG1A exciter PT/CT terminal board, serves as the primary isolation‑transformer interface used to execute generator PT voltage and CT current signal routing across EX2100 excitation platforms. The board provides transformer‑isolated measurement paths, fused PT inputs, CT‑safe terminal blocks, and one selectable analog input for voltage or 4–20 mA current.
Hardware Specifications
Parameter
Specification
Model
IS200EPCTG1A
Brand
General Electric
Origin
USA
Weight
0.45 kg
Dimensions
23.8 cm × 8.6 cm
Operating Temp
-30 to 65 deg C
Power Supply Voltage
28 V DC
Series
EX2100
Product Type
Exciter PT/CT Terminal Board
PT Input Rating
115 V rms, 50/60 Hz
CT Input Rating
1 A or 5 A
Analog Input
10 V DC or 4–20 mA (non‑isolated)
Manual Reference
GEI‑100459
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As an EX2100 excitation‑system measurement board, EPCT aligns with deterministic controller timing and transformer‑isolated signal propagation:
Q: Can EPCT boards be used in redundant configurations? A: Yes. Up to three EPCT boards may be installed for highest reliability, with voltage and current signals fanned to M1, M2, and C controllers.
Q: How is the analog input type selected? A: Jumper JP1 selects voltage or 4–20 mA current mode.
Q: Why are TB2 and TB3 non‑removable? A: They prevent accidental CT open‑circuit conditions, which can damage CTs or produce unsafe voltages.
Field Installation Guidelines
Use #12 AWG wiring for PT and CT inputs; maintain fused PT connections and ensure CT circuits remain closed during installation.
Maintain transformer‑secondary wiring separation to reduce noise coupling into EMIO measurement paths.
Verify JP1 jumper position before energizing to ensure correct analog‑input mode.
Keep TB1 removable for maintenance; do not remove TB2 or TB3 under any circumstance.
Ensure proper seating of connectors J305, J308, and J315 for stable controller fanout.
Use test points TP1–TP8 for transformer‑secondary verification during commissioning.
