GE IS200EPSMG2AEC

The GE IS200 EPS MG 2 AEC is a digital 32-point excitation power supply module developed by General Electric (GE) specifically for gas/steam turbine control systems (Mark VI/Mark VIe). Classified under the category of Exciter Power Supply (EPSM), it is responsible for converting system power into multiple regulated DC voltages, providing reliable power supply to excitation systems, controllers, and on-site I/O devices.

2. Key Technical Parameters (Common Specifications)

• Input Voltage: 380 V AC (supports 3-phase 380 V ±10%)
• Output Voltage: 50 V DC intermediate voltage + multiple channels of 5 V, 12 V, 24 V, 48 V, 115 V, 230 V DC (32 channels in total)
• Power: Approximately 2 kW (maximum 60 W per channel)
• Operating Temperature: –20 °C ~ +55 °C (compliant with industrial on-site environments)
• Protection Class: IP20 (for use inside cabinets)
• Communication Interface: Monitors with Mark VI/VIe controllers via fieldbuses (e.g., Profibus, Modbus)
• Redundancy: Supports dual-module hot backup for seamless switching
• Dimensions: 1U (19-inch rack)
• Weight: ≈ 2.5 kg

3. Product Features

• High Reliability: Adopts double-layer PCB, full-bridge push-pull inverter, and isolation transformer to ensure electrical isolation between input and output, preventing interference.
• Modular Design: Features a 1U rack-mount form factor, facilitating plugging, unplugging, and replacement inside the cabinet, with hot-swappable support.
• Wide Input Range: Compatible with multiple grid voltages, suitable for power plants in different regions worldwide.
• Multiple Output Channels: Provides 32 independent excitation voltages with a single power supply, meeting the multi-point power demands of large-scale excitation systems.
• Self-Diagnosis and Monitoring: Built-in fault detection (for overvoltage, overcurrent, and overtemperature) and real-time status reporting to the control system.
• Redundant Backup: Can form a redundant pair with another module of the same model to improve system availability.

4. Structure and Composition

• Input Filtering/Rectification Unit: Converts 380 V AC to DC and suppresses noise.
• Buck Regulator: Stabilizes the rectified voltage to 50 V DC intermediate voltage.
• Push-Pull Inverter + Isolation Transformer: Generates multiple high-voltage/low-voltage outputs based on 50 V DC and achieves electrical isolation.
• Output Distribution Board: Equipped with 32 independent output channels, each with overcurrent/overvoltage protection.
• Control/Communication Interface: Connects to the fieldbus or Ethernet interface of Mark VI/VIe controllers for status monitoring and parameter configuration.
• Heat Sink: A passive heat sink that ensures stable operation of the module in high-temperature environments.

5. Typical Application Fields

• Gas/Steam Turbines: Power supply for unit excitation systems, rotor current supply, and excitation control of synchronous generators.
• Power Plant Automation: Power backup for main control systems and power distribution for on-site I/O devices.
• Petrochemical Industry: Power supply module for high-reliability process control systems.
• Large-Scale Industrial Automation: PLC and DCS subsystems that require multiple regulated power supplies.
• Offshore Platforms: Modular power supply solutions for limited-space environments.

6. Installation and Maintenance Points

Pre-Installation Inspection

1. Confirm that the cabinet power supply meets the 380 V AC requirement and that the phase sequence is correct.
2. Check the cabinet’s ventilation and heat dissipation conditions to ensure the ambient temperature is ≤ 55 °C.

Mechanical Installation

1. Slide the module into the 1U slot of the 19-inch rack and secure it with screws.
2. Connect the input power cables (3-phase) and use shielded cables to connect the control bus.

Electrical Wiring

1. According to the wiring diagram, connect the 32 output terminals to the corresponding excitation or I/O devices respectively.
2. Install appropriate terminal protective covers for each output channel to prevent incorrect connections.

Commissioning and Testing

1. After power-on, read the module status (voltage, temperature, fault code) through the control system.
2. Check whether the output voltage of each channel is within the specified range, and record and save the parameters.

Daily Maintenance

1. Inspect the heat sink for dust accumulation every 6 months and clean it if necessary.
2. Monitor the module’s self-diagnostic log and promptly replace output channels that have triggered overvoltage/overcurrent protection.
3. When a redundant module fails, switch to the standby module via the control system first, then replace the faulty one.

Troubleshooting

• Overtemperature: Check cabinet ventilation and confirm that the heat sink is not blocked.
• Overvoltage/Overcurrent: Locate the abnormal output channel and check for load issues or line short circuits.
• Communication Failure: Confirm that the fieldbus connection and terminal resistance comply with specifications.

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