What are the common failures of UPS power supply? How to deal with it?

by:Power Kingdom     2021-06-15

What are the common failures of UPS power supply? How to deal with it?

1. When the utility power is on, the UPS will have a utility power failure alarm.

Possible reasons

1. The mains input circuit breaker has tripped.

2. The input AC line is in poor contact.

3. The mains input voltage is too high, too low or the frequency is abnormal.

4. The UPS input MCB or switch is damaged or the fuse is blown.

5, UPS internal mains detection circuit failure.

Processing method

1. Check the input blank.

2, check the input line.

3. If the mains power supply is abnormal, do not handle it or start the generator to supply power.

4. Replace the damaged MCB, switch or fuse.

5. Check the UPS mains detection circuit.

2. When the mains power is normal, the UPS output is normal; after the mains power is cut off, the load is also cut off.

Possible reasons

1. Because the mains is often low voltage, the battery is under voltage.

2. The UPS charger is damaged and the battery cannot be charged.

3. The battery is aging and damaged.

4. Load overload, UPS bypass output.

5. The load is not connected to the UPS output.

6. The battery pack of the long back-up model is not connected or has poor contact.

7. The UPS inverter is not started (the UPS panel control switch is not turned on), and the load is supplied by the mains bypass.

8. The inverter is damaged and the UPS bypass output.

Treatment method

1. A. Fully charge the battery when the mains voltage is normal.

B. Start the generator to charge the battery.

C. Add a voltage regulator to the UPS input.

2, check the charger.

3. Replace the battery.

4. Reduce the load.

5. Connect the load to the output of the UPS.

6. Check whether the battery pack is properly connected.

7. Start the inverter to supply power to the load (open the panel control switch). 8. Check the inverter.

Three, UPS cannot start.

Possible reasons

1. The battery has been left unused for a long time, and the voltage is low.

2. The input AC and DC power cables are not connected properly.

3, UPS internal startup circuit failure.

4. The internal power circuit of the UPS is faulty or the power is short-circuited.

5. The internal power components of the UPS are damaged.

Treatment method

1. Fully charge the battery.

2. Check whether the input AC and DC wires are in good contact.

3. Check the UPS startup circuit.

4. Check the UPS power circuit.

5. Check whether the internal rectifier, boost, inverter and other parts of the UPS are damaged.

Four. The buzzer will beep suddenly when the UPS is in normal use.

Possible reasons

1. The user has a large load or a large impact load to start.

2. The output terminal is suddenly short-circuited.

3, UPS internal inverter circuit failure.

4. UPS protection and detection circuit malfunction.

Processing method

1. A. When the load is put on, follow the order of big first and then small.

B. Increase the power capacity of UPS.

2. Check whether the output of the UPS is short-circuited.

3. Check the UPS inverter.

4. Check the internal control circuit of the UPS.

5. The UPS works normally but the load equipment is abnormal.

Possible causes

1. The UPS output zero-ground voltage is too high.

2. The UPS ground wire and the load equipment ground wire are not connected at the same point.

3. The load equipment is subject to abnormal interference.

Treatment method

1. Check the UPS grounding. If necessary, connect a 1-3KΩ resistor between the UPS output terminal and the ground.

2. Connect the UPS ground and load ground to the same point.

3. Restart the load equipment.

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