Emerson 7400 - Manual (Page 58)

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Series 7400 Single Phase 1+N UPS
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.
1. 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 to 325V (note that at
320V the battery circuit breaker will trip and 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 un-sealed batteries vary,
and should be obtained from the battery manufacturer.
5.3.4 Extended Service
5.3.5 Battery
Maintenance