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Fault phenomenon: UPS input undervoltage (overvoltage) alarm
 
 
Fault phenomenon: UPS input undervoltage (overvoltage) alarm            

Fault analysis: 

1. After AC is power off, the input voltage of UPS is 0V , which is less than alarming threshold (180V)             2. UPS sampling AC input voltage is more than overvoltage alarming threshold (250V)            

Troubleshooting:            

1. check whether the external AC220V power supply is normal. 
 
 
 

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