Chapter 5 - Maintenance 7400 Series UPS User Manual
Scheduled Maintenance Single Module and One plus One Systems
6310018a.02.doc
5-4
Issue 2
(02/98)
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.
8. Reconnect the UPS input mains power.
9. Start the UPS and transfer the load to the inverter following the
appropriate operating procedure.
10. If possible, check the battery autonomy time by opening the input
isolator (I1) with the UPS on-load. Close the input isolator
immediately the dc busbar voltage falls within 5 volts of the battery
end of discharge voltage. (note For units operating at 380V a.c. the
end of battery discharge is assumed when the battery voltage falls to
320 Vd.c. For units operating at 400V a.c. the end of discharge
voltage is taken as 330 Vd.c. For units operating at 415V a.c. the
end of discharge voltage is taken as 340 Vd.c. At these voltages the
battery circuit breaker will trip and the load will power-down, unless
a split bypass system is in use whereupon the load will transfer to
bypass). Ensure that the available battery autonomy time meets the
installation specifications.
We recommend that ALL the input/output power cables and their
connections are checked periodically. As this requires the UPS to be
completely shut down such a check should be carried out on an
‘opportunity’ basis but at an interval not exceeding 2 years.
The batteries used with the UPS are generally of a sealed, valve-
regulated type, and the only maintenance requirement is to ensure that
the cells are kept clean and dry. Maintenance procedures appropriate to
both valve-regulated and non-sealed batteries vary, and should be
obtained from the battery manufacturer.
5.3.4 Extended service
5.3.5 Battery maintenance
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