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A: A: Possible causes of failure:
1. The input voltage is too low;
2. The phase detection board fails;
3. The main control board fails;
4. Wrong voltage setting in P29 or P02 groups.
Countermeasures:
1. Measure the input power supply to judge whether the power is off or the input voltage is too low;
2. Replace the input phase loss detection board and judge whether it is damaged.
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