Figure 6.9 Transfer UP S to N orm al m o d e
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.
CA U T IO N: Before m aking this op eration, read the inform ation on th e TO U C H S CR E E N to m ake
sure that the bypass supply is norm al and that the inverter is synchronous w ith the byp ass
supply, so as not to risk a short interruption in pow er to the load.
1. Shut down the inverter according to Transfer from Normal Mode to Bypass Mode .
N O T E: T he alarm can be silenced but leaves the alarm m essage displayed until the alarm condition is
rectified.
2. Close the maintenance bypass switch Q3.
3. At the moment, the maintenance bypass parallels with the UPS static bypass.
4. The TOUCHSCREEN displays 'Maint. Switch Closed'.
CA U T IO N: W hen the U PS is in m aintenance m ode, the load is not protected against abnorm al
m ains supply.
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
112
Vertiv™ Liebert® EXM2 UPS User Manual
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