GE IS200EPCTG1A Input/Output Terminal Board

Functional Overview

The IS200EPCTG1A serves as an Exciter PT/CT Terminal Board within the GE EX2100 excitation control platform. It receives and conditions critical generator voltage and current feedback signals. Specifically, this input/output terminal board provides galvanic isolation between high-voltage field circuits and low-voltage control electronics.

Technical Specifications

Parameter	Specification
Product Type	Input/Output Terminal Board
Series	EX2100 Excitation Control
PT Inputs	Two 3-phase, 115V AC RMS
CT Inputs	Two channels, 1A or 5A
Analog Input	One channel, 0–10V DC or 4–20mA
Isolation Transformers	T1 through T6, open delta configuration
Terminal Blocks	Three (TB1 removable; TB2, TB3 fixed)
Connectors	J305, J308, J315 (to EMIO board)
Test Points	TP1–TP8
Power Supply Voltage	28V DC
Operating Temperature	-30°C to +65°C
Weight	0.45 kg
Country of Origin	USA

Signal Conditioning Architecture

The IS200EPCTG1A employs six isolation transformers to process field signals from potential and current transformers. Two 3-phase PT inputs arrive at 115V AC RMS at 50/60Hz. Meanwhile, two CT inputs accept either 1A or 5A current levels. The board creates a three-wire open delta measurement output of 1.533V RMS for each 115V RMS PT input.

Furthermore, one analog input accepts either a 0–10V DC voltage or a 4–20mA current signal. Jumper JP1 selects the input type, while connectors J305, J308, and J315 distribute conditioned signals to the EMIO board.

Safety and Installation Notes

Terminal blocks TB2 and TB3 remain permanently fixed for a critical safety reason. These CT shorting blocks prevent dangerous high-voltage development during maintenance activities. Additionally, the board supports #10 AWG wiring with cable runs reaching 1000 feet. Conformal coating protects the PCB from moisture, dust, and chemical contaminants.