UPS inverter power in the case of access to electricity

UPS inverter power in the case of access to electricity, and every time you open UPS, we heard the sound of the relay repetitive movements, UPS panel, low battery voltage indicator is lit and the buzzer sounding.
According to the above symptoms can be judged: the failure is caused by the battery voltage is too low, leading to an unsuccessful start caused by Home inverter ups. Remove the battery, the first for a balanced charge (charging all batteries in parallel), if we do not succeed, then only replace the batteries.
6, open the mains power supply is normal UPS, inverter operation indicator flashes, the buzzer sounds intermittently,high frequency online ups inverter can only work in the state, can not be converted to electricity working condition.
Failure Analysis: power inverter can not be converted to electricity supply, indicating that the inverter power supply fails to convert part of the electricity supply, we should focus on testing:
- Mains input fuse is damaged;
- If the mains input fuse is good, check the mains rectifier filter circuit output is normal;
- If the mains rectifier filter circuit output is normal, check the mains detection circuit is normal;
- If the mains detection circuit is normal, and then check the inverter power supply is normal to the mains power switch control output.