Possible causes:

The mains input air switch trips;

Poor contact of input AC line;

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

UPS input air switch or switch is damaged or fuse is blown;

UPS internal mains power detection circuit failure.

processing method

Check the input air switch. Check the input line;

If the mains supply is abnormal, do not handle or start the generator to supply power;

Replace the damaged air switch, switch or fuse;

Check UPS mains power 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 causes

The battery is under voltage due to the low voltage of the mains supply;

The UPS charger is damaged and the battery cannot be charged;

Battery aging and damage;

Load overload, UPS bypass output;

Load is not connected to UPS output;

The battery pack of the long delay model is not connected or has poor contact;

UPS inverter is not started (UPS panel control switch is not opened), and the load is powered by mains bypass;

The inverter is damaged, and UPS bypass output.

processing method

Fully charge the battery when the mains voltage is normal; Start the generator to charge the battery; Add voltage stabilizer at UPS input end;

Check the charger. Replace the battery;

Reduce the load. Connect the load to the output of UPS;

Check whether the battery pack is connected correctly;

Start the inverter to supply power to the load (open the panel control switch);

Check the inverter.

3 UPS fails to start

Possible causes

The battery is not used for a long time, and the voltage is low;

Input AC and DC power lines are not connected properly;

UPS internal startup circuit fault;

UPS internal power circuit fault or power short circuit;

The power components inside the UPS are damaged.

processing method

Fully charge the battery;

Check whether the input AC and DC lines are in good contact;

Check the UPS power on circuit;

Check the UPS power circuit;

Check whether the components in the rectifier, booster, inverter and other parts of the UPS are damaged.

4 When UPS is started, input air switch trips

Possible causes

The input air switch capacity is too small;

UPS internal short circuit;

The power components inside the UPS are damaged;

The utility air switch of the user is provided with leakage protection.

processing method

Replace the input air switch;

Check whether the components in the rectifier, booster, inverter and other parts of the UPS are damaged;

Check whether the components in the rectifier, booster, inverter and other parts of the UPS are damaged;

Replace with air switch without leakage protection.

5 When UPS is in normal use, a long buzzer alarm suddenly appears

Possible causes

The user starts with heavy load or heavy impact load;

Sudden short circuit at the output end;

UPS internal inverter circuit fault;

UPS protection and detection circuit malfunction.

processing method

The load shall be put into operation in the order of first large and then small; Increase the power capacity of UPS;

Check whether the output of UPS is short circuited;

Check the UPS inverter. Check the UPS internal control circuit.

6 UPS works normally but load equipment is abnormal

Possible causes

UPS output zero ground voltage is too high;

UPS ground wire and load equipment ground wire are not connected at the same point;

The load equipment is subject to abnormal interference.

processing method

Check the UPS grounding. If necessary, connect a 1-3K Ω resistance between the zero and ground of the UPS output terminal;

Connect UPS ground and load ground to the same point;

Restart the load device.