Figure 6.9 T ransfer UPS to Norm al m ode
6.3.4 Transfer from Normal Mode to Maintenance Mode
The following procedures will transfer the UPS from inverter output mode to the maintenance bypass mode.
CAU TIO N : Pow er supp ly interruption danger of the load. Before m aking th is operation, read
the inform ation on the TO U C H S C REE N to m ake sure that the bypass supply is norm al and
that th e inverter is synchronous with the bypass supply, so as to not risk a short interruption
in p ow er to the lo ad.
1. Shut down the inverter according to Transfer from Normal Mode to Bypass Mode.
N O T E: The alarm can be silen ced but leaves the alarm m essage displayed until the alarm co ndition is
rectified.
2. Close the maintenance bypass switch Q3.
3. At the moment, the maintenance bypass and UPS static bypass are in parallel.
4. The TOUCH SCREEN displays 'Maint. Switch Closed'.
CAU TIO N : W h en the UP S is in m aintenance m ode, the load is not protected against abnorm al
m ains su pp ly.
5. Pressing the EPO button stops the operation of rectifier, inverter, static switch, and battery, but this action will
not affect the maintenance bypass power the load normally.
6 Single UPS Operation Introduction
103
Vertiv™ Liebert® APM Plus User Manual
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