GE IS200EPDMG1BAA Power Distribution Module | Mark VI

The General Electric IS200EPDMG1BAA is a critical power management component within the Speedtronic Mark VI and EX2100 excitation control systems. This Power Distribution Module serves as the central hub for receiving, conditioning, and distributing all power to the exciter control cabinet, ensuring reliable and protected operation.

Core Technical Specifications

• Brand & Model: General Electric IS200EPDMG1BAA
• Series: Speedtronic Mark VI / EX2100 Excitation Control
• Module Type: Exciter Power Distribution Module (EPDM)
• Dimensions (HxW): 17.8 cm x 33.02 cm.
• Input Power: Accepts 125 V DC (station battery) and dual 120 V AC inputs for backup.
• Technology: Surface-mount construction.

Primary Power Management Functions

• Central Power Hub: The main power distribution backbone for the exciter control cabinet.
• AC to DC Conversion Interface: Routes AC inputs to external DACA (AC to DC Converter) units for rectification to 125 V DC.
• Power Conditioning: Inputs are filtered via the board-mounted terminal block (TB1) before distribution.
• Voltage Rails: Distributes diode-coupled DC voltages: +62.5V (P125V) and -62.5V (R125V) to ground.
• Comprehensive Coverage: Supplies power to key exciter boards including EGPA, EXTB, and EPSM modules.

Hardware Features & Components

• Terminal Blocks & Connectors: Features a 24-point terminal block (TB1) and ten 600V-rated plug connectors (J1-J10) for secure power connections.
• Switches & Fuses: Equipped with 7 toggle switches and 14 fuses (rated 125 V DC, 6 A) for individual circuit control and protection.
• Visual Indicators: Eight green LED indicators provide immediate status of power availability on each output circuit.
• Grounding: Four chassis-grounding mounting holes ensure system stability and safety.
• Adjustable Jumper (BJS): Allows for isolation of ground references when an external ground is used.

Safety & Protection

• Fused Protection: Each power output to the exciter boards is individually fused for overload protection.
• Switch Control: Each circuit includes an on/off toggle switch for safe maintenance isolation.
• Robust Grounding: Dedicated grounding holes mitigate electrical risks and ensure operational stability.

System Integration & Application

• Compatibility: Designed for integration into GE Speedtronic Mark VI and EX2100 excitation control systems for gas, steam, and wind turbines.
• Mounting: Installs within the exciter control cabinet, interfacing with external DACA converters via JDACA1 and JDACA2 connectors.
• Role: Ensures clean, stable, and protected power delivery to all critical exciter control and power electronics boards.

Frequently Asked Questions (FAQ)

What are the primary power inputs to this module?

The module accepts a primary 125 V DC input from the plant station battery. It also has provisions for one or two 120 V AC backup inputs, which are routed to external DACA converters to be rectified to 125 V DC.

What do the LEDs on the module indicate?

The eight green LEDs are status indicators. Each LED corresponds to a specific power output circuit. When lit, it indicates that power is successfully present and flowing through that fused and switched circuit to its destination board (e.g., an EGPA or EPSM).

How is this module grounded for safety?

It is grounded through four specific board mounting holes designed for chassis and safety grounding. This is a critical step during installation to prevent electrical hazards and ensure stable module operation.

What is the purpose of the external DACA units?

The DACA (AC to DC Converter) units are external devices that convert the 120 V AC backup power inputs into the 125 V DC required by the exciter control system. The EPDM module interfaces with them but does not perform the AC/DC conversion internally.

Can I isolate a single board for maintenance using this module?

Yes. Each output circuit has a dedicated toggle switch and fuse. To safely isolate a board like an EGPA for maintenance, you can turn off its corresponding toggle switch on the IS200EPDMG1BAA module, cutting power without affecting the rest of the system.