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The GE IS200EPDMG1BAA is the Exciter Power Distribution Module (EPDM) used in the EX2100 Excitation Control System, which is fully integrated into the GE Mark VI Speedtronic Turbine Control System.1
Its primary function is to serve as the central power control and protection hub for the low-voltage control electronics in the exciter cabinet.2
⚡ Key Functions and Role
The EPDM manages the incoming power supply and distributes it safely and reliably to the various control, I/O, and protection boards.3
- Power Source Management: It receives its primary power from the 4$\text{125 V DC}$ station battery for reliability.5 It can also accept one or two 6$\text{120 V AC}$ inputs for backup power; these are externally rectified to 7$\text{125 V DC}$ by Ac-to-Dc Converters (DACA modules).8
- Distribution: It routes the resulting 9$\text{125 V DC}$ power (which is typically center-grounded to 10$\text{+62.5 V}$ and 11$\text{-62.5 V}$ nominal to ground) to essential modules mounted on the Exciter Power Backplane (EPBP), including:12
- The Exciter Power Supply Modules (EPSM), which generate the logic-level voltages (13$\text{+5 V}$, 14$\text{+15 V}$, 15$\text{+24 V}$) for the main controllers.16
- The Exciter Gate Pulse Amplifier (EGPA) boards.17
- The Exciter Terminal Board (EXTB).18
- Protection and Control: The board includes numerous safety and control features:19
- Fuses: Each individual power output is fused (the board contains fourteen fuses) to protect downstream circuitry from overcurrent faults.20
- Switches: It features seven toggle switches (rated 21$\text{125 V DC}$, 22$\text{6 A}$) that allow maintenance personnel to manually isolate the power to specific modules (like the three EPSM boards) without shutting down the entire control system.23
- LED Indicators: Eight green LED indicators show the power availability and status for various outputs.24
🛠️ Technical Specifications
| Specification | Detail |
| Name | Exciter Power Distribution Module (EPDM) |
| Series | EX2100 Excitation Control / Mark VI |
| Input Power | $\text{125 V DC}$ (Station Battery) and $\text{120 V AC}$ (Backup, requires DACA converter) |
| Output Type | Fused and Switched $\text{125 V DC}$ |
| Interface Components | 24-point terminal block, 7 toggle switches, 14 fuses, 8 LED indicators |
| Revision | The G1BAA is a specific hardware/firmware revision within the EPDM family. |
| Mounting | Typically mounts on the side of the Exciter Power Backplane (EPBP). |
The EPDM is essential for maintaining the high availability and redundancy of the EX2100 control system by providing segmented, protected, and manually controllable power distribution.
