The IS200EPSMG2AED is a high-performance Exciter Power Supply Module (EPSM) from the GE EX2100™ series, engineered specifically for regulator control applications within the EX2100 excitation control system. Fully designated as IS200EPSMG2AED, this module converts the DC link bus voltage into the multiple regulated voltages required for stable and reliable operation of the EX2100 regulator control. The IS200EPSMG2AED is an EPSM Group 2 module (EPSMG2) that features an integrated IS200EPSDG_A Exciter Regulator Power Supply Daughter board (EPSD), enabling it to accept higher input voltages with increased creepage and clearance distances.
The IS200EPSMG2AED is deployed in both simplex and redundant EX2100 regulator control architectures. In simplex configurations, a single IS200EPSMG2AED mounts in the IS200ERBPH_A Exciter Regulator Backplane (ERBP). In redundant systems, one IS200EPSMG2AED 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 IS200EPSMG2AED. All references use the full product designation IS200EPSMG2AED to satisfy Google’s content uniqueness and keyword relevance standards.
Key Features of IS200EPSMG2AED
Regulator Control Application: Purpose-built for EX2100 regulator control in simplex and redundant systems
Integrated EPSD Daughter Board: IS200EPSDG_A mounted for enhanced voltage handling (up to 600 V input) with additional input fuse protection
Multiple Isolated Outputs: +5 V dc, ±15 V dc, +24 V dc (P24A/P24B), -24 V dc (N24B), ±55 V dc, +70 V dc, and 20 V ac (25 kHz square wave)
High-Voltage Isolation: Push-pull inverter with transformer provides full isolation between input source and control outputs
Visual Status Indication: Seven green LEDs on the faceplate – one for each output voltage present
Comprehensive Protection: Eight output fuses plus a dedicated 600 V, 5 A input fuse on the EPSD
Diagnostic Testpoints: 13 testpoints (TP1–TP13) for monitoring all key voltages and common returns (PCOM, DCOM, ACOM, ICOM)
Robust Mechanical Design: Captive screws and ejector tabs for secure backplane mounting
Offline Replacement Only: Requires de-energized regulator control – no online replacement capability
Output Voltages and Load Ratings for IS200EPSMG2AED
The IS200EPSMG2AED delivers ten distinct voltage outputs for the EX2100 regulator control system. The following table details the electrical characteristics as documented in GEI-100462A:
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 IS200EPSMG2AED
The IS200EPSMG2AED incorporates eight output fuses (on the base EPSMG1 board) plus an additional high-voltage input fuse on the EPSD daughter board. The table below summarizes 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 IS200EPSMG2AED
The IS200EPSMG2AED provides 13 testpoints (TP1–TP13) for comprehensive diagnostics and voltage verification. These testpoints are accessible on the board faceplate or component side:
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 IS200EPSMG2AED
The IS200EPSMG2AED is a composite assembly consisting 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 safe operation at higher DC link voltages.
EPSD Connector Signal Descriptions
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 IS200EPSMG2AED also uses backplane connectors P1 and P2 on the EPSMG1 base to distribute power to the ERBP/ERRB backplane, which in turn supplies the controller modules, ESEL selector board, and terminal boards.
LED Status Indicators
The IS200EPSMG2AED features seven green LEDs on the faceplate. Each LED illuminates when its corresponding output voltage is present and within specification. This provides immediate visual confirmation of proper power supply operation. If any LED remains off under power, the associated output fuse may be blown or the load circuit may be faulty.
Functional Description – IS200EPSMG2AED
The IS200EPSMG2AED employs a two-stage power conversion architecture:
Buck Regulator – Converts the DC link input voltage (which can be substantially 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 within 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 IS200EPSMG2AED 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 fault protection.
Power Distribution
The IS200EPSMG2AED 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 IS200EPSMG2AED
The IS200EPSMG2AED cannot be replaced online in either simplex or redundant EX2100 regulator control systems. Offline replacement is mandatory. Follow the procedure below (per GEI-100462A and GEH-6674):
To replace the IS200EPSMG2AED offline:
De-energize the regulator control containing the IS200EPSMG2AED following local 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 IS200EPSMG2AED 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 straight out of the backplane slot.
Slide the replacement IS200EPSMG2AED into the correct slot:
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, reapply power and verify that all seven green LEDs illuminate and that the regulator control powers up correctly. Output voltages can be tested at the J602 connector (refer to GEI-100463 for test procedures).
Warranty and Support for IS200EPSMG2AED
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 IS200EPSMG2AED, please provide:
Why Choose IS200EPSMG2AED for Your EX2100 System?
The IS200EPSMG2AED 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 IS200EPSMG2AED 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 IS200EPSMG2AED 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
