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The GE IS200EPSMG2AED Exciter Power Supply Module (EPSM Group 2) is a specialized power conversion board used within the EX2100 Excitation Control System, which is part of the GE Mark VI/VIe Speedtronic platform.1
The G2 designation marks a specific functional group of EPSM boards, distinguishing it from the standard G1 boards, mainly by its application and its hardware configuration.2
⚡ Primary Function (Power Conversion)
The core function of the IS200EPSMG2AED is to take the high-voltage DC input from the system’s power bus and convert it into the precise, regulated low-voltage DC power required to operate the control electronics.3
| Output Voltage | Purpose |
| +5 V DC | Logic supply for digital components (DSPs, FPGAs). |
| $\pm \text{15 V DC}$ | Analog supply for I/O and signal conditioning circuits. |
| +24 V DC | Control supply for relays, drivers, and external devices (fans, crowbar modules). |
| Isolated +70 V DC | Contact Wetting—a voltage applied to low-current relay contacts to ensure a reliable electrical connection. |
💡 Key Features of the IS200EPSMG2AED (Group 2)
The EPSMG2 group is specifically designed for use in the EX2100 Regulator Control section and has a distinct physical component compared to the standard EPSMG1:4
- EPSD Daughterboard: The EPSMG2 includes an attached Exciter Regulator Power Supply Daughterboard (EPSD), which is the IS200EPSDG1AAB board.5
- High-Voltage Input: This daughterboard modifies the power input path to increase the creepage and clearance distances (insulation safety margins).6 This modification allows the EPSMG2 to safely accept and convert the potentially higher voltage from the DC-link bus in the exciter regulator power section.7
- Protection: The EPSD also incorporates a high-voltage fuse (8$\text{600 V}$, 9$\text{5 A}$) between the DC-link input and the EPSM’s internal buck-regulator circuit, offering enhanced protection against current faults.10
- Redundancy: In redundant (TMR) EX2100 systems, two EPSMG2 boards are typically used and are designed for hot-swapping (replacement while the system is running).11
In summary, the IS200EPSMG2AED is the specialized version of the Exciter Power Supply Module built to handle the higher-voltage environment of the exciter’s power regulator control while ensuring isolated, clean power for the logic circuits.
