Weekly Checks; Annual Service - Liebert 7400 Series User Manual

7400 Series UPS User Manual
Single Module and One plus One Systems
5.3.2

Weekly checks

5.3.3

Annual Service

6310018a.02.doc
Carry out the following checks from the mimic panel and log the results:
1. Measure and record the battery float charge voltage.
2. Measure and record the battery charge current.
3. Measure and record the UPS output voltage on all three phases.
4. Measure and record the UPS output line currents. If these are
significantly different from the values previously logged then, if
possible, record the size, type and location of any additional load
connected to the UPS supply since the previous inspection. This type
of information could prove useful to the troubleshooting engineer
should a problem occur.
If any of the above indications differ greatly from the previously
logged values for no apparent reason then you should contact the
Customer Service & Support Department at the address given at the
front of this manual for advice.
The equipment should be thoroughly cleaned and the following checks
carried out annually. This entails working inside the equipment in
regions containing hazardous voltages.
A manufacturer-trained engineer is fully aware of the hazards concerned
and will carry out this procedure with the load connected to the
maintenance bypass supply; however if the customer decides to carry out
this service procedure himself it is imperative that the UPS be totally
shut down and isolated from the input mains and bypass supplies and
batteries using the procedure given below. We therefore strongly
recommend that the annual service is carried out by trained personnel.
1. Carry out the weekly checks detailed above.
2. Shut down the UPS following the recommended operating
procedure.
3. Isolate the UPS input mains supply externally (also the bypass
supply if a split bypass system is in use) and isolate the battery.
4. Ensure that the UPS is totally powered down by checking for voltage
at the mains input terminals, battery connection terminals, and
output terminals (and bypass mains input terminals in a split bypass
configuration).
5. Gain full access to the UPS interior by opening its internal hinged
safety panel.
Chapter 5 - Maintenance
Scheduled Maintenance
5-3
Issue 2
(02/98) LCA 10/01