IS200EXHSG3A GE Mark VI

The IS200EXHSG3A is a high-speed relay driver and sensor terminal board developed by GE for the EX2100 static excitation system; it is part of the fourth-generation Mark VI series hardware. As a high-performance printed circuit board assembly, the IS200EXHSG3A integrates three core functions—high-speed relay driving, bidirectional Hall sensing, and online monitoring—into an ultra-slim form factor.

It connects to three exciter main input/output (EMIO) boards (for redundant control) or a single EMIO board (for simplex control) via the exciter backplane, enabling precise control of the generator excitation system. On one hand, it drives high-speed relays to rapidly switch the excitation circuit on and off; on the other hand, it monitors key parameters of the excitation system—such as current and voltage—in real time and provides rapid protection in the event of a fault.

• Input Voltage: 24 VDC
• Rated Current: 10 A
• Relay Output: 9 solid-state relays, 3 A/250 V
• Operating Time: ≤1 ms
• Hall Sensors: 2 channels, ±200 A/±1200 V
• Sampling accuracy: 12-bit Σ-Δ ADC, bandwidth 1 kHz
• Isolation withstand voltage: 2.5 kV RMS
• Logic input: 5 V DC (TTL-compatible)
• Operating temperature: -30°C to +65°C
• Storage temperature: -40°C to 85°C
• Relative humidity: 5% to 95% (non-condensing)
• Vibration resistance: Connections remain secure under 5 g vibration

1. Power-Off Preparation: Ensure the excitation system has been deactivated and that all electrical I/O circuits in the control cabinet have been turned off.
2. Cable Labeling: To simplify reconnection, ensure all cables are correctly labeled with the connector names (as marked on the board).
3. Removing the Old Board: Carefully disconnect all cables from the EXHS board and remove the mounting screws.
4. Installing the New Board: Mount the new EXHS board onto the bracket, positioning it in the same orientation as when it was removed.
5. Reconnecting: Reconnect all cables according to the markings, ensuring both ends are properly seated.