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General Electric IS200ECTBG1A Exciter Control Terminal Board Item NO.: 2907267

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Product Name	General Electric IS200ECTBG1A Exciter Control Terminal Board
Item NO.	2907267
Weight	0.1 kg = 0.2205 lb = 3.5274 oz
Category	GE
Brand	GE
Creation Time	2026-09-11

General Electric

IS200ECTBG1A

Exciter Control Terminal Board

EX2100 / Mark VI

AVR Signal Interface · DIN Rail Mount · Simplex/Redundant

Product Overview

The IS200ECTBG1A is an Exciter Control Terminal Board (ECTB) from GE's EX2100 Excitation Control System. It serves as the signal interface and terminal connection point between the Exciter Regulator Backplane (ERBP) and the field wiring of the generator excitation system.

Unlike the ERBP, which is a passive VMEbus backplane, the IS200ECTBG1A is an active terminal board that provides conditioning and routing for critical analog and digital signals. It is typically mounted on a DIN rail within the Regulator Control Cabinet and connects to the ERBP via dedicated ribbon cables.

The board is essential for interfacing with PT (Potential Transformer) and CT (Current Transformer) inputs, as well as providing termination for field flashing, de-excitation, and other auxiliary control signals. It supports both Simplex and Redundant configurations, ensuring reliable operation in demanding power generation environments.

Technical Specifications

Parameter	Value
Brand	General Electric (GE)
Model	IS200ECTBG1A
Type	Exciter Control Terminal Board (ECTB)
Country	United States
Series	EX2100 / Mark VI Excitation Control
Functional Acronym	ECTB (Exciter Control Terminal Board)
Operating Mode	Simplex or Redundant (jumper selectable)
Mounting	DIN Rail (typically within Regulator Control Cabinet)
Primary Connection	Ribbon Cable to IS200ERBPG1A backplane
Signal Types	Analog (PT/CT), Digital (Status/Control)
Hosted Modules	Connects to ACLA, DSPX, ERIO, EPSM via backplane
Auxiliary Connectors	Terminal blocks for field wiring, test points
Board ID System	Onboard serial bus reads barcode, type, and hardware revision
Weight	Approx. 2.50 lbs (1.13 kg)

Regulator Rack Architecture

How the IS200ECTBG1A Interfaces with the Regulator Logic Section

The IS200ECTBG1A acts as the signal gateway for the AVR function. It sits between the high-voltage field wiring and the low-voltage control logic, ensuring proper isolation and signal conditioning.

Provides termination for PT and CT inputs used by ACLA and DSPX
Routes analog feedback signals to the ERIO module
Interfaces with EPSMG2 for power distribution monitoring
Supports field flashing and de-excitation control signals

Connects to the IS200ERBPG1A via ribbon cable
Distributes +5 V DC, +24 V DC, ±15 V DC from EPSM to field devices
Supports Simplex Mode for brushless retrofits, reducing retrofit CAPEX
Provides test points for signal verification without disconnecting field wiring

Connector Allocation & Signal Routing

IS200ECTBG1A Interface Points

The IS200ECTBG1A provides dedicated terminal blocks for field wiring and ribbon cable connectors for backplane communication. The power and signal connectors are located along the edges for easy access.

TB1 — PT input terminal block (Generator Voltage)
TB2 — CT input terminal block (Generator Current)
J1 — Ribbon cable connector to IS200ERBPG1A (ERBP)
J2 — Auxiliary signal connector (Field Flashing)

J3 — Test point header for signal monitoring
J4 — DIN rail ground connection
J5 — Redundant backplane interconnect (ERRB)
J6 — EDCF (Exciter DC Feedback) signal interface

FAQ

We are seeing erratic voltage readings on our EX2100 system. How can we verify if the IS200ECTBG1A PT input terminals are the issue?

The IS200ECTBG1A provides the PT input interface via terminal block TB1. Check that the PT wiring is secure and that there is no oxidation on the terminals. If the readings are erratic, use the test points (J3) on the IS200ECTBG1A to measure the incoming signal directly. If the signal is stable at the test points but erratic in the control logic, the issue is likely downstream. If the signal is erratic at the test points, inspect the PT connections and the IS200ECTBG1A terminal block for damage.

Our IS200ECTBG1A board is mounted on a DIN rail. What is the recommended torque for the field wiring terminal blocks?

The IS200ECTBG1A uses standard screw-type terminal blocks for field wiring. While exact torque specifications can vary, a general rule for this type of industrial terminal block is to tighten to approximately 0.5 to 0.6 Nm (4.4 to 5.3 lb-in). Over-tightening can damage the block, while under-tightening can lead to loose connections and signal noise. Always refer to the specific GE EX2100 manual for precise torque values.

We need to add a redundant relay board to our IS200ECTBG1A-based regulator system. Where does the ERRR board connect?

The IS200ECTBG1A provides the connection point for the ERRR (Exciter Regulator Redundant Relay) board at connector J5. The ERRR board receives power and signal from this dedicated tap. When adding redundancy, verify that the master selection jumpers on the IS200ERBPG1A backplane are configured for Redundant mode and that the ERRB interconnect at J3 on the ERBP is properly cabled.

Our IS200ECTBG1A has been in storage and we need to install it. What should we inspect before rack installation?

Inspect the ribbon cable connectors (J1, J2) for bent or oxidized pins. Verify that the TB1 and TB2 terminal blocks are secure and that the DIN rail mounting clips are intact. Check the J3 test point header for physical damage. Since the board carries high-current power rails alongside sensitive analog signals, ensure the gold-fingered edge connectors on the ribbon cables are clean before inserting them into the IS200ERBPG1A backplane.

Can the IS200ECTBG1A provide power to a replacement cooling fan directly?

No, the IS200ECTBG1A is a signal interface board and does not provide direct fan power outputs. Fan power is typically provided by the IS200ERBPG1A backplane via connectors J1F1 and J1F2. If a fan has stopped, check the fan power output at the corresponding connector on the ERBP. If voltage is present at J1F1 or J1F2 but the fan does not rotate, the fan itself has failed. Replace the fan and reconnect to the appropriate J1F connector on the backplane.

Moore Automation

Moore Automation supports power generation facilities with legacy excitation control systems. Our focus is on helping plants maintain GE EX2100 regulator racks when original OEM support is no longer available and replacement terminal boards become difficult to source.

We understand the urgency of regulator rack failures. When the AVR signal interface is compromised, generator voltage regulation is at risk. Our team provides fast quotes, verified condition reports, and shipping options that align with your maintenance window.

Connector integrity inspection for DIN and D-SUB interfaces
Revision-level matching for GE EX2100 ECTB boards

Supported Brands

GE Bently Nevada Woodward ABB Emerson Triconex Honeywell Siemens

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