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Vertiv™ Liebert® APM Plus User Manual
6.3 Procedures for Transfer Between Operation Modes
6.3.1 Transfer from Normal Mode to Battery Mode
Open the external power switch to isolate the mains power and initiate the UPS on battery mode. To transfer the UPS back to
normal mode, close the external power switch to re-connect the mains power to the UPS. 10 seconds later, the rectifier
restarts automatically, and the UPS works in normal mode.
6.3.2 Transfer from Normal Mode to Bypass Mode
Click the Off key as shown in Figure 6.8 below, and the UPS will transfer to bypass mode.
Figure 6.8 Transfer UPS to Bypass mode
NOTE: In bypass mode, the load is directly fed by the mains power instead of the pure AC power from the inverter.
6.3.3 Transfer from Bypass Mode to Normal Mode
When the UPS is in bypass mode, click the On key as shown in Figure 6.9 on the facing page, and the inverter starts up. Then
the UPS is transferred from bypass mode to normal mode.
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6 Single UPS Operation Introduction
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