Vertiv Liebert APM2 Installer/User Guide

2.4 Working Principle
The Vertiv™ Liebert® APM2 lithium battery modules, along with UPS equipment, provide uninterruptible power supplies for
communications, and data processing equipment, as a backup energy storage system for critical equipment.
2.4.1 Modular design
The electrical principle of Liebert® APM2 lithium battery module system is configured with two levels of BMS protection,
which are BMS and control module. The Liebert® APM2 lithium battery module is internally designed with two protections,
which are DC contactors and fuses, and the electrical schematic diagram of the Liebert® APM2 lithium battery module is
shown in Figure 2.4 below.
Figure 2.4 Liebert® APM2 Lithium Battery Module System Schematic Diagram
Item Description Item Description
1 Module 1-6 Battery module 9 Serial port RS-485 serial port
2 MCB Miniature circuit breaker 10 Main fuse Main fuse
3 Input 12 V External 12 V input 11 DC source DC auxiliary power supply
4 Indicator light Light panel 12 BMS Battery management system control board
5 Contactor High and low voltage connectors 13 Negative contactor Main negative contactor
8 Proprietary and Confidential ©2024 Vertiv Group Corp. 2 Overview
Vertiv™ Liebert® APM2 Lithium Battery Module Installer/User Guide

Vertiv Liebert APM2 Specifications

General

Brand	Vertiv
Model	Liebert APM2
Category	UPS
Language	English