7.5 Battery Cold Start
APM2 supports battery mode start function. If batteries are available without AC power, the UPS can start from batteries.
Users can press and hold the red button on the front panel of the power module for at least two seconds, and the LCD will
display the startup screen. After the rectifier starts up, the alarm indicator light is yellow and the buzzer keeps beeping. The
user can then turn on the inverter.
APM2 supports the cold start function of the lithium battery module; toggle the cold start switch, and when the BMS detects a
low-voltage hard wire input signal on the cold start pin, the BMS performs a cold start. At the same time, the BMS performs a
self-check on the state of the lithium battery. If the lithium battery is intact, the BMS will power on the HV and output it to the
external load.
7.6 Safety
WARNING! Work carefully with the batteries connected to the UPS when all the blocks are connected, the
battery string voltage can be up to 540 VDC. This is potentially dangerous. Follow the precautions for high
voltage operation. Only qualified personnel can install and maintain the battery.
To ensure safety, the external batteries are to be installed inside a lockable cabinet or in a purpose designed, dedicated
battery room, so that they are only accessible to qualified service personnel.
Make sure that the battery switch has been disconnected before battery maintenance.
7.6.1 Hazardous battery voltage present behind covers
1. No user serviceable parts are located behind covers that require a tool for their removal. Only qualified service
personnel are authorized to remove such covers.
2. Before working on the copper bars connected to the external battery, ensure they are disconnected from all
power supplies.
Figure 7.1 Proper Connection Mode
Tighten the terminal bolt of the battery with specified torque.
7 Battery Proprietary and Confidential ©2023 Vertiv Group Corp. 127
Vertiv™ Liebert® APM2 30 to 120 kVA Modular UPS User Manual
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