Item Description Item Description
1 Battery 4 Automatic inverter switch
2 Battery charger/discharger 5 Output switch
3 Inverter 6 UPS output
NOTE: Battery cold start function is available for switching the UPS ON from Battery (charged) mode directly during
mains failure. Therefore, the battery power supply is used independently to improve the availability of the UPS.
Automatic restart mode
The APM2 UPS has automatic restart function. When the inverter shuts down because the mains failure and the battery
discharges to EOD voltage, if the mains is recovered, the UPS will restart automatically after a certain time of delay.
NOTE: These two functions must be set by a Vertiv authorized service engineer.
Automatic restart helps to delay the shutdown process and the UPS will charge the battery to protect against the power OFF
risk of the load device caused by mains power failure.
NOTE: The user can manually start the UPS through RESET FAULT function, if the automatic restart function has not
set.
Bypass mode
When the UPS is in bypass mode Figure 2.9 below and the inverter fails or the inverter gets overloaded or the inverter is
shutdown manually, the static switch will transfer the load from the inverter to bypass without interrupting the power to the
load.
NOTE: While transferring of load from the inverter to the bypass, if both are not synchronized, power supply to the
load has transitory interruption, with a time of less than 20 ms.
Figure 2.9 Schematic Diagram of Bypass Mode
Item Description Item Description
1 Bypass input 4 Output switch
2 Bypass input switch 5 UPS output
3 Static switch
16 Proprietary and Confidential ©2023 Vertiv Group Corp. 2 Overview
Vertiv™ Liebert® APM2 30 to 120 kVA Modular UPS User Manual
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