Product Overview

The General Electric IS200EPSMG1A is an exciter power supply module. It belongs to the EX2100 turbine control system family. This module converts 125 VDC input to multiple output voltages. You can use the IS200EPSMG1A for EX2100 excitation control applications. It mounts in the EPBP backplane under the control rack. Industrial users trust this module for reliable turbine excitation power.

Technical Specifications

The IS200EPSMG1A delivers stable power for excitation control systems. Below are the core technical details.

General Specifications:

• Product Type: Exciter Power Supply Module (EPSM).

• Series: EX2100 Excitation Control.

• Functional Acronym: EPSM (Group 1).

• Location: Mounts in the EPBP backplane.

• Function: Converts 125 VDC to logic level voltages.

• Used With: EPDM module.

Physical Specifications:

• Weight: 1 lb 8 oz (0.68 kg).

• Country of Manufacture: United States (USA).

• Manual: GEI-100462 (product specific) or GEH-6632 (series).

Repair Information:

• Repair Time: 3-5 days.

Functional Description

The IS200EPSMG1A consists of two major internal parts. These are a buck-regulator and a push-pull inverter.

How It Works:

1. The buck-regulator converts input voltage to an intermediate 50 V dc.

2. The push-pull inverter receives this 50 V dc.

3. The inverter generates the necessary multiple output voltages.

4. The inverter’s transformer provides high-voltage isolation.

Application:
The IS200EPSMG1A is used in EX2100 Excitation Control Systems. EPSM Group 1 modules are for excitation control. EPSM Group 2 modules are for regulator control (different application).

Power Output Specifications

The IS200EPSMG1A provides several DC output voltages.

Backplane Power (to EPBP):

• +5 V dc

• +15 V dc

• +24 V dc

External Module Power (24 V dc):

• Fans

• De-excitation module (EDEX)

• Crowbar module

• Ground detector module (EGDM)

• Field voltage/current module

Isolated Contact Wetting (70 V dc):

• Terminal board contact wetting (ECTB and EXTB modules)

EX2100 System Integration

The IS200EPSMG1A powers critical excitation control components.

Controllers Powered:

• Each of the three controllers (M1, M2, and C) uses independent EPSMG1 modules. Each controller gets its own IS200EPSMG1A.

Physical Installation:
The module installs in the EPBP backplane. This backplane sits beneath the EBKPG (Exciter Backplane). Power transfers from the IS200EPSMG1A to the EPBP via connectors P1 and P2. Cables then route to the EBKP and other boards.

Version Compatibility Note

The IS200EPSMG1A is an A revision board.

• This board is not backward compatible with previous versions.

• Verify your system requirements before purchasing.

• The manual GEI-100462 covers this specific A version.

Installation Guidelines

Install the IS200EPSMG1A into the EPBP backplane. Ensure the system power is completely off before insertion. Seat the module firmly into connectors P1 and P2. The backplane is located beneath the EBKPG rack in the control cabinet. Connect the 125 VDC input from the EPDM module. Verify all output voltages (5V, 15V, 24V) are present after power-up. The IS200EPSMG1A does not require external cooling fans. Keep the module away from excessive dust and moisture.

What is in the Box

Please inspect all items upon delivery.

• General Electric IS200EPSMG1A exciter power supply module.

• Anti-static protective bag.

• Installation reference sheet (basic).

Frequently Asked Questions (FAQ)

1. What is the difference between EPSMG1 and EPSMG2?
EPSMG1 (like the IS200EPSMG1A) is for excitation control. EPSMG2 is for regulator control. EPSMG2 requires an EPSD daughter board for higher voltage acceptance.

2. Can I replace an older EPSM module with the IS200EPSMG1A?
No. The IS200EPSMG1A is A revision and not backward compatible. You must check your system’s manual for the correct revision.

3. What input voltage does this module require?
The IS200EPSMG1A requires 125 VDC input from the EPDM power distribution module. Do not apply AC voltage or other DC voltages.

4. How many IS200EPSMG1A modules are needed for a complete system?
A typical EX2100 system uses three independent IS200EPSMG1A modules. One each for the M1, M2, and C controllers.

5. What is the purpose of the 70V isolated output?
The isolated +70 VDC is for contact wetting on terminal boards. This provides reliable dry contact switching. The IS200EPSMG1A supplies this to ECTB and EXTB modules.