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A: Firstly, confirm that the GD200A input power supply is normal, and observe that the input voltage is normal during operation. If a UV fault is reported during operation for models above 55kW, and it is obvious that the DC bus voltage drops. Then we need to start from the following two aspects:
1. The fan may cause a short circuit, check the fan. Please disconnect the fan, then try to test. You will find there is a cable between fan and auxiliary power board, please take out that cable. Then try to check the problem happen or not. If not happen, that means fan need to replace.
2. Listen to whether there is a sound of contactor closing when starting, if not, replace the contactor and check 24 V power board.
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