Common faults and solutions of Emerson switching power supply - AC contactor does not close [Fault phenomenon] The AC operation light is not on; the rectifier module does not work; the monitoring module has AC fault, module communication interruption and other alarms [Fault cause] 1. The AC input exceeds the normal working range (the maximum working range is 125~285V, considering the impact of hysteresis on the normal working voltage range of 145~265V); 2. AC sampling board A14C3S1 is faulty; 3. AC drive control board A14C3C1 is faulty; 4. AC contactor is faulty; 5. AC logic control board A14C3C2 is faulty.
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