Liebert UPS System user manual Chapter Service after Sales

Chapter 10

Service after Sales

No.1

Fault description

Reason

Actions to be taken

The battery life is reduced due to

aging, which may endanger the

Notify the service dept for replacing the

16

Battery needs to be

normal operation of UPS. Warn

battery and set the battery model and

replaced

the user that the battery is

parameters through software.

abnormal and needs to be

replaced.

17

No battery

Batteries are not connected.

Check

the

battery and

the

wiring

of

batteries

The battery discharges to pre-

18

Pre-alarm for end of

alarm point（the battery capacity

Shut down the load in time

battery discharging

is inadequate），the system may

shut down after a few minutes

19

battery over temperature

battery temperature is too high

Check

the

battery

temperature

and

ventilation

20

battery self-test is disabled

The battery condition for self-test

Start the self test after the conditions

is not satisfied

can meet the requirements

21

Battery is connected

Battery is connected reverse

Notify

the

UPS service

engineer

to

reverse

connect the battery again

22

Bypass

phase rotation is

Bypass phase rotation is reverse

Notify

the

UPS service

engineer

to

reverse

change the bypass phase rotation

23

Rectifier

heatsink

over

Rectifier

heatsink temperature is

The UPS

can

recover

automatically.

temperature

too high

Check the environment and ventilation

24

Rectifier fan fails

Rectifier fan is abnormal

Replace the fan in time and the UPS

can recover automatically

Inverter

is

asynchronous with

Check if the bypass is normal. The fault

25

Inverter asynchronous

alarm

stops automatically

after

the

bypass

bypass recovers normal

26

Inverter

heatsink

over

Inverter

heatsink temperature is

The UPS

can

recover

automatically.

temperature

too high

Check the environment and ventilation

27

Inverter fan fails

Inverter fan is abnormal

Replace the fan in time and the UPS

can recover automatically

The IGBT of inverter has over

Restart the inverter, if the fault can’t be

28

Inverter over current

current resulting in the shut down

cleared, notify the service dept for

if inverter.

repairing.

Check whether there is fault in rectifier

29

Shutdown due to low bus

DC bus voltage is too low result in

side,

if no,

then

check whether

voltage

the shutdown of inverter

overload occurs. Restart after clearing

the fault.

30

Output

transformer

over

Output transformer temperature is

Auto recovery, ambient and ventilation

temperature

too high

of UPS should be checked.

31

Overload of single UPS

Load is too heavy

Disconnect

unnecessary

load

and

ensure the safety.

32

Overload of system

System load is too heavy

Disconnect

unnecessary

load

and

ensure the safety.

33

Overload exceeds normal

Over load

occurs in inverter

If the load decreases after 5 minutes,

time

mode, transfers to bypass mode

the system will back to inverter mode

114