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A: 1. Check whether the input cable voltage is too low or the power supply voltage fluctuates too much. If so, adjust the grid voltage to the normal range.
2. Check whether the DC bus voltage displayed on the keypad is normal (1.35 times of the input voltage), and check whether the factory voltage level setting is correct. If it is not a standard voltage, adjust it to an appropriate voltage.
3. If the power is above 37kW, check whether the fan is normal. If the fan is stuck or burnt out, the contactor will not close and report UV.
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