When there is electricity high frequency online ups output is normal, no electricity when the buzzer sounding, no output.
Failure Analysis: From the phenomenon judged as part of the fault and reverse battery device, according to the following procedure to check:
- Check the battery voltage, to see whether the battery charging less, if the battery charging less, will have to check the battery itself is a fault or charging circuit.
- If the battery working voltage is normal, check the inverter drive circuit is working properly, if the driver circuit output is normal, indicating that the inverter is damaged.
- If the inverter drive circuit is not working properly, check the PWM control signal output waveform generator circuit or without, if the control signal output, indicating a fault in the inverter drive circuit.
- If no PWM waveform generation circuit control signal output, check its output is a result of the protection circuit and the blockade, if it is to identify the cause of protection;
- If the protection circuit does not work properly and the operating voltage, and waveform generation circuit without PWM waveform output then the waveform generator circuit damage.
Therefore, the discharge order can be reversed were sometimes able to quickly find faults.
