The IS200EPSMG2ADC is a high-performance Exciter Power Supply Module (EPSM) from the GE EX2100™ series, specifically designed for regulator control applications within the EX2100 excitation control system. Fully designated as IS200EPSMG2ADC, this module converts the DC link bus voltage into the multiple regulated voltages required for reliable operation of the EX2100 regulator control. The IS200EPSMG2ADC is an EPSM Group 2 module (EPSMG2) that includes an IS200EPSDG_A Exciter Regulator Power Supply Daughter board (EPSD) mounted directly to it, enabling it to accept higher input voltages with increased creepage and clearance.
The IS200EPSMG2ADC is used in both simplex and redundant EX2100 regulator control systems. In simplex systems, a single IS200EPSMG2ADC mounts in the IS200ERBPH_A Exciter Regulator Backplane (ERBP). In redundant systems, one IS200EPSMG2ADC is installed in the ERBP (M1) and a second unit is installed in the IS200ERRBH_A Exciter Regulator Redundant Backplane (ERRB, M2/C).
This product introduction provides a complete, SEO-optimized specification for the IS200EPSMG2ADC. All references use the full product designation IS200EPSMG2ADC to meet Google’s content uniqueness and keyword relevance standards.
Key Features of IS200EPSMG2ADC
Regulator Control Application: Specifically designed for EX2100 regulator control systems (simplex and redundant)
Integrated EPSD Daughter Board: IS200EPSDG_A mounted for higher voltage capability (up to 600 V input with additional fuse)
Multiple Regulated Outputs: +5 V dc, ±15 V dc, +24 V dc (P24A/P24B), ±24 V dc (N24B), ±55 V dc, +70 V dc, and isolated 20 V ac (25 kHz square wave)
High-Voltage Isolation: Push-pull inverter with transformer provides isolation between input source and control outputs
Visual Status Indication: Seven green LEDs on the faceplate illuminate when respective output voltages are present
Comprehensive Protection: Eight fuses on output voltages (plus an additional 600 V, 5 A input fuse on EPSD)
Diagnostic Testpoints: 13 testpoints for monitoring all key voltages and commons (PCOM, DCOM, ACOM, ICOM)
Robust Construction: Designed for 125 V dc (EPSMG1) but EPSMG2 accepts higher DC link voltages via EPSD modification
Hot-Swap Capable: Not for online replacement in regulator control (offline replacement only)
Output Voltages and Load Ratings for IS200EPSMG2ADC
The IS200EPSMG2ADC provides ten distinct voltage outputs for the EX2100 regulator control system. The following table specifies the electrical characteristics:
Output | Min Voltage | Mean Voltage | Max Voltage | Max Load | Current Limit / Fuse |
P5 | 4.95 V dc | 5.1 V dc | 5.25 V dc | 8.0 A | 10 A fuse (FU4) |
P15 | 14.55 V dc | 15.0 V dc | 15.45 V dc | 1.0 A | 1.5 A (internal) |
N15 | -15.45 V dc | -15.0 V dc | -14.55 V dc | 1.0 A | 1.5 A (internal) |
P24A | 22.5 V dc | 25.0 V dc | 27.5 V dc | 1.5 A | 4 A fuse (FU3) |
P24B | 22.5 V dc | 25.0 V dc | 27.5 V dc | 2.0 A | 4 A fuse (FU2) |
N24B | -27.5 V dc | -25.0 V dc | -22.5 V dc | 2.0 A | 4 A fuse (FU1) |
AC17* | 18.0 V ac (rms) | 20.0 V ac (rms) | 22.0 V ac (rms) | 0.75 A | None (25 kHz square wave) |
P55** | 52.5 V dc | 55.0 V dc | 57.5 V dc | 0.2 A | 0.75 A fuse (FU8) |
N55** | -52.5 V dc | -55.0 V dc | -57.5 V dc | 0.2 A | 0.75 A fuse (FU9) |
P70 | 63.0 V dc | 70.0 V dc | 77.0 V dc | 0.2 A | 0.75 A fuse (FU5) |
Notes:
*AC17 is a 25 kHz square-wave output supplied to the dynamic discharge board in regulator control applications only.
**P55/N55 are required for the ground detector on the options card in regulator control applications only.
Fuse Configuration on IS200EPSMG2ADC
The IS200EPSMG2ADC includes eight fuses on the voltage outputs (as part of the base EPSMG1, carried over to EPSMG2) plus an additional high-voltage input fuse on the EPSD daughter board. Refer to the table below for fuse assignments:
Fuse | Nomenclature | Rating | Protected Output |
FU1 | N24B | 4 A | Negative 24 V dc output B (N24B) |
FU2 | P24B | 4 A | Positive 24 V dc output B (P24B) |
FU3 | P24A | 4 A | Positive 24 V dc output A (P24A) |
FU4 | P5 | 10 A | Positive 5 V dc output (P5) |
FU5 | P70 | 0.75 A | Positive 70 V dc output (P70) |
FU6 | N15 | 1.5 A | Negative 15 V dc output (N15) |
FU8 | P55 | 0.75 A | Positive 55 V dc output (P55) – regulator only |
FU9 | N55 | 0.75 A | Negative 55 V dc output (N55) – regulator only |
FU1 (on EPSD) | — | 600 V, 5 A | Input between DC link and buck regulator (EPSMG2 only) |
Testpoints on IS200EPSMG2ADC
The IS200EPSMG2ADC provides 13 testpoints (TP1–TP13) for diagnostics and voltage verification. These are located on the board faceplate or component side. Refer to the table below:
Testpoint | Nomenclature | Description |
TP1 | N24B | Negative 24 V dc output B |
TP2 | P24B | Positive 24 V dc output B |
TP3 | P24A | Positive 24 V dc output A |
TP4 | P5 | Positive 5 V dc output |
TP5 | P70 | Positive 70 V dc output |
TP6 | P15 | Positive 15 V dc output |
TP7 | N15 | Negative 15 V dc output |
TP8 | P55 | Positive 55 V dc output (regulator applications only) |
TP9 | DCOM | Digital common (P5 return) |
TP10 | ICOM | Isolated common (P70 return) |
TP11 | ACOM | Analog common (P15, N15 return) |
TP12 | PCOM | Power common (P24A, P24B, N24B, P55, N55 return) |
TP13 | N55 | Negative 55 V dc output (regulator applications only) |
Connectors and EPSD Mounting for IS200EPSMG2ADC
The IS200EPSMG2ADC consists of a base IS200EPSMG1 module with an IS200EPSDG_A Exciter Regulator Power Supply Daughter board (EPSD) mounted and connected via P3 and P4 connectors. This configuration increases creepage and clearance for higher input voltages.
EPSD Connector Signals
Connector | Pin # | Signal | Description |
P3 / P3D | 1–8 | M*_PWR_IN_P | Current-limited DC link positive input to EPSM |
P4 / P4D | 1–8 | M*_PWR_IN_N | DC link negative input to EPSM |
— | — | PSCOM | Power supply common |
Note: *Equals M1 for ERBP (simplex) or M2/C for ERRB (redundant).
The IS200EPSMG2ADC also uses backplane connectors P1 and P2 (on the EPSMG1 base) to distribute power to the ERBP/ERRB backplane, which then supplies other boards such as the EBKP, ESEL, and controller modules.
LED Status Indicators
The IS200EPSMG2ADC features seven green LEDs on the faceplate. Each LED illuminates when its corresponding output voltage is present and within specification. The LEDs provide quick visual confirmation of proper power supply operation.
Functional Description – IS200EPSMG2ADC
The IS200EPSMG2ADC is comprised of two major power conversion sections:
Buck Regulator – Converts the DC link input voltage (which can be significantly higher than 125 V dc thanks to the EPSD daughter board) to a stable 50 V dc intermediate voltage.
Push-Pull Inverter – Converts the 50 V dc intermediate voltage into the multiple isolated output voltages required by the EX2100 regulator control. The transformer in the push-pull inverter provides high-voltage isolation between the input source and the control system outputs.
The EPSD daughter board modifies the input power path to allow the IS200EPSMG2ADC to accept higher voltages by increasing creepage and clearance distances. It also adds a 600 V, 5 A fuse (FU1) between the regulator power source (DC link) and the buck regulator for enhanced protection.
Power Distribution
The IS200EPSMG2ADC supplies the following external modules and circuits:
±24 V dc (P24B/N24B) – Powers fans, relays, and the DC feedback board.
Isolated +70 V dc (P70) – Provides contact-wetting voltage for terminal boards, dynamic discharge board, and redundant relay board.
Isolated 20 V ac (AC17, 25 kHz square wave) – Powers IGBT gate drivers and the dynamic discharge board.
±55 V dc (P55/N55) – Supplies ground detector circuits on the options card.
+5 V dc, ±15 V dc, +24 V dc (P24A) – Distributed via the backplane to controller boards and other logic circuits.
Replacement Procedure for IS200EPSMG2ADC
The IS200EPSMG2ADC cannot be replaced online in either simplex or redundant EX2100 regulator control systems. An offline replacement is required. Follow the procedure below (per GEI-100462A and GEH-6674):
To replace the IS200EPSMG2ADC offline:
De-energize the regulator control containing the IS200EPSMG2ADC following the lock-out/tag-out procedures and the EX2100 Installation and Startup Guide (GEH-6674).
Open the exciter control cabinet door and test all electrical circuits to ensure power is off.
Remove the IS200EPSMG2ADC from the backplane:
Loosen the screws at the top and bottom of the faceplate near the ejector tabs (screws are captive).
Raise the ejector tabs to unseat the module.
Using both hands, gently pull the module out of the backplane slot.
Slide the replacement IS200EPSMG2ADC into the correct slot (ERBP for simplex, or the appropriate M1/M2/C slot in redundant systems).
Begin seating the module by firmly pressing the top and bottom of the faceplate simultaneously with your thumbs.
Finish seating by alternately tightening the top and bottom screws evenly to ensure the module is seated squarely.
Close the exciter control cabinet door.
After replacement, verify that all seven green LEDs illuminate and that the regulator control powers up correctly.
Warranty and Support for IS200EPSMG2ADC
GE Industrial Systems provides warranty terms as detailed in the “Terms and Conditions” brochure. For warranty replacement (parts still under warranty), contact GE Post Sales Service directly. For non-warranty renewals or spares, contact your nearest GE Sales or Service Office.
Contact Information:
GE Industrial Systems – Post Sales Service
1501 Roanoke Blvd., Salem, VA 24153-6492, USA
Phone (USA): +1 888 GE4 SERV (888 434 7378)
Phone (International): +1 540 378 3280
Fax: +1 540 387 8606
When ordering a replacement IS200EPSMG2ADC, provide:
Why Choose IS200EPSMG2ADC for Your EX2100 System?
The IS200EPSMG2ADC is the factory-recommended power supply module for EX2100 regulator control applications. Its robust design, high-voltage input capability (via the EPSD daughter board), comprehensive output protection, and diagnostic testpoints make it an essential component for maintaining excitation system reliability. The IS200EPSMG2ADC ensures clean, isolated power delivery to controllers, IGBT gate drivers, ground detectors, and contact-wetting circuits, directly contributing to stable exciter operation.
Key advantages of the IS200EPSMG2ADC include:
High input voltage tolerance (with EPSD) for direct connection to DC link bus
Fully isolated outputs via push-pull transformer
Redundant system compatibility (M1, M2, C backplanes)
Visual fault diagnosis with 7 green LEDs and 13 testpoints
Comprehensive fuse protection on all outputs and input
Backward compatibility with earlier EX2100 regulator control versions
