Weekly Checks; Annual Service - Liebert 7200 Series User Manual

Chapter 5 - Mantenance
Scheduled Maintenance
5.3.2

Weekly checks

Carry out the following checks from the mimic panel and log the results:
1. Measure and record the battery 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.
5.3.3

Annual Service

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 rectifier input
connections (U1, V1 & W1), the battery connection terminals, the output connections (U2,
V2 & W2) and the bypass input connections (U3, V3 & W3).
5. Gain full access to the UPS interior by opening its internal hinged safety panel.
6. Carry out a thorough examination of the UPS power components and sub-assemblies, paying
particular attention to the following:-
Electrolytic capacitors - Check for signs of leakage, buckling etc.
Magnetic components - Check for signs of overheating, security of fixture and signs of
delamination.
Cables and connections - Check cables for chaffing, fraying or signs of overheating. Check
that all printed circuit board connectors are secure.
Printed circuit boards - check the cleanliness and integrity of the circuit boards and replace if
any signs of deterioration are found.
7. Thoroughly clean inside the equipment enclosure using a vacuum cleaner and low pressure air
to remove any foreign debris.
Page 5-2
Issue 6
(03/98)
document in response to "powersure ups"
7200 Series UPS User Manual
Single Module and 1+1 Parallel System