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Chapter 10 UPS maintenance
Battery replacement methods
There are two recommended battery replacement methods:
1. Replacing batteries using the Maintenance Bypass Panel
2. Replacing the batteries by powering down the UPS unit
Replacing batteries using the Maintenance Bypass Panel
1. Schedule a maintenance window for both the UPS and the protected load, make sure
that all vital data is backed up
2. Switch the UPS to bypass mode, this will transfer the load directly to utility power
3. Remove all batteries from the UPS and any attached Extended Battery Module
4. Install all new batteries into the UPS and attached Extended Battery Module
5. Leave the UPS running in by-pass mode for 48 hours
6. Switch the UPS back to on-line mode after the 48 hours
Replacing the batteries by powering down the UPS unit
1. Schedule a maintenance window for both the UPS and the protected load, make sure
that all vital data is backed up
2. Make sure that the load can be run off directly from utility power rather than the UPS
3. Power the UPS off at the UPS front bezel and turn off the upstream circuit breaker
4. Remove all batteries from the UPS and any attached Extended Battery Module
5. Install all new batteries into the UPS and attached Extended Battery Module
6. Turn on the upstream circuit breaker
7. Power the UPS up and let it run in on-line mode for the 48 hours
8. After 48 hours transfer the protected load to the UPS
Attention! Once batteries are replaced, it is important to run a charge cycle of 48 hours to ensure the
capacity and runtime is synchronized. Two battery tests are performed during that portion
of the ABM cycle, three measurements are performed and will ensure there are no bad
cells in the battery string.
The battery algorithm needs a known starting point for ABM functionality, battery test and
the estimated runtime to be reasonable. Charging the batteries for 48 hours ensures those
functions are set correctly and advised for any start-up to ensure the batteries are good
and the timers are setup correctly.
Run a manual battery test and then let the batteries charge for 48 hours. See
Display functions
manually start a battery test.
During the 48 hour charge cycle the UPS is not to protect any load!
6U Rack or Tower UPS RT8kVA and RT11kVA IUOMG
under
Control
/
Start battery test
for additional information on how to
Chapter 3
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