46 Chapter 7 Maintenance And Troubleshooting
Liebert
®
ITA 5kVA And 6kVA UPS User Manual
7.3 Cleaning UPS
Clean the UPS periodically, especially the ventilation holes or the dust filters, to ensure free airflow inside the UPS. If
necessary, clean the UPS with a vacuum cleaner. Confirm that the ventilation holes are unobstructed.
7.4 Checking UPS Status
It is recommended to check the UPS operation status once every half a year.
Check the following items:
1. Check whether the UPS is faulty: Is the FAULT indicator on? Is the UPS giving any alarm?
2. Check whether the UPS is operating in Bypass mode. Normally, the UPS operates in Normal mode; if it operates in
Bypass mode, find out the reason, such as operator intervention, overload, internal fault, and so on.
3. Check whether the battery is discharging: When mains is normal, the battery should not discharge; if the UPS
operates in Battery mode, find out the reason, such as mains failure, battery test, operator intervention, and so on.
7.5 Checking UPS Functions
Note
Procedures for checking the UPS functions may cause power interrupt to load.
It is recommended to check the UPS functions once every half a year.
Backup the load data before conducting the UPS functions check. Procedures are as follows:
1. Press the OFF key to check whether the buzzer, the indicators and the LCD are normal.
2. Press the ON/SILENCE key to check again whether the indicators and the LCD are normal, the UPS has been
transferred to the Inverter mode.
3. After the UPS starts to operate in Inverter mode (INVERTER indicator is on), press and hold the ON/SILENCE key
for four seconds, the battery self-test will start to check whether the battery is normal. If any battery problem is found,
find out the reason immediately and take measures to solve the problem.
7.6 Troubleshooting
In the event of UPS abnormity and fault, shoot the trouble according to the instructions in Table 7-1. If the fault persists,
seek technical support and service from the local service center of Emerson.
Table 7-15 Troubleshooting table
No.
Fault
Possible cause
Action to take
Input power not connected
to the UPS
Check that the UPS input cables are connected properly
1
The mains MCB is closed;
however the display panel
does not display, and the UPS
does not conduct self-test
Input voltage extra low
Use a voltmeter to confirm that the UPS input voltage is
within specifications
UPS mains MCB open
Close the UPS mains MCB
2
The mains is normal; however
the MAINS indicator is off, and
the UPS is in Battery mode
Input cables improperly
connected
Connect the UPS input cables properly
3
No UPS alarm is generated;
however the UPS has no
output voltage
Output cables improperly
connected
Make sure the output cables are properly connected
Time of holding the key too
short
Press and hold the ON/SILENCE key for more than one
second till the buzzer beeps
4
After the ON/SILENCE key is
pressed, the UPS does not
start up
Overload
Remove all loads and restart the UPS
5
The MAINS indicator blinks
Mains voltage or frequency
beyond the UPS input range
If the UPS is operating in Battery mode, note the battery
back-up time
6
The buzzer beeps every 0.5
second, and the LED displays
OVERLOAD
Overload
Remove some non-priority loads
7
The FAULT indicator is on, and External battery switch open Close the external battery switch