Liebert UPS System user manual Service after Sales

Chapter 10 Service after Sales

Table 10-2 Fault information of Single module UPS system

No.1

Fault description

Reason

Actions to be taken

1

Ambient over-temperature

over-temperature of UPS room

Check the ventilation

2

Environment

parameter

1

Environment parameter channel 1

Check

the

devices

relating

to

the

abnormal

has alarm

channel

3

Environment

parameter

2

Environment parameter channel 2

Check

the

devices

relating

to

the

abnormal

has alarm

channel

4

Environment

parameter

3

Environment parameter channel 3

Check

the

devices

relating

to

the

abnormal

has alarm

channel

5

Environment parameter

12V

environment

parameter

Check

the

devices

relating

to

the

abnormal

channel has alarm

channel

6

Rectifier input voltage

Line-to-neutral voltage of rectifier

Check the input line-to-neutral voltage

abnormal

exceeds normal operation range

amplitude of rectifier

Rectifier input under-

Line-to-neutral voltage of rectifier

Check the input line-to-neutral voltage

7

lower than 305V, but higher than

amplitude of rectifier

voltage

208V

8

Rectifier’s input voltage

Rectifier

frequency

exceeds the

Check

the

rectifier’s

input

voltage

frequency is abnormal

normal range

frequency

9

Input fuse blows

Rectifier input fuse blows up

Notify the service dept for repairing

10

Input transformer over

Temperature of input transformer

Check

the

ambient temperature

and

temperature

is too high

ventilation

11

Input phase rotation

Rectifier’s input phase rotation is

Notify the UPS service engineer, check

Reverse

reverse

the wiring of rectifier input cables

Bypass voltage or frequency is

Check the bypass voltage and

12

Bypass unsynchronized

out of normal range and inverter

frequency

output is not synchronized with

the bypass output.

Bypass

voltage

or

frequency

Check the bypass voltage and

13

Bypass ratings exceed the

exceeds

the normal

range and

frequency

normal range

the bypass will not power the load

anymore.

Bypass over current

If the

over current

time exceeds

Check

the

load, if it

is normal,

then

14

the limit, the UPS may shut down

restart the UPS

timeout

the bypass and the inverter.

When the overload time is due in

Repair the bypass and reduce the load,

15

Shutdown due to bypass

inverter mode, if at this time the

and then restart the UPS. Note: Don’t

fault

bypass has fault, then the inverter

let the UPS in over load state for a long

is shut down.

time.

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