NOTE: The input/output (I/O) neutral line inside the UPS is interoperable. If the external neutral line is not
disconnected during maintenance, pay attention to safety.
Figure 6.1 UPS Power Switch Four Switches (120 kVA)
Item Description Item Description
1 Q1 3 Q5
2 Q2 4 Q3
6.2 UPS Startup Procedures
The Vertiv™ Liebert® APM2 UPS must be completely installed and commissioned before startup by an authorized engineer.
The external power supply switch must be closed. After these conditions are met, the UPS can be started.
6.2.1 Startup procedures in normal mode
WARNING! These procedures result in mains voltage being applied to the UPS output terminals.
WARNING! If any load equipment is connected to the UPS output terminals, check with the user that it is safe
to apply power. If the load is not ready to receive power, disconnect the downstream load switch, and place a
warning label on the connection point of the load.
To start the UPS from a fully powered down condition, follow the below procedure:
1. Open the front door of the UPS.
NOTE: Ensure that the internal maintenance bypass switch Q3 is disconnected, while the input cables and copper bars
are reliably connected.
2. Close the external input switch.
3. Ensure that the UPS input voltage, frequency, and phase are normal.
102 Proprietary and Confidential ©2023 Vertiv Group Corp. 6 Single UPS Operation
Vertiv™ Liebert® APM2 30 to 120 kVA Modular UPS User Manual
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