Chapter 5 Operations; Introduction; Fig. 5-1: Single Unit Block Diagram - Vertiv Liebert APM User Manual

30 - 150kw, single module and parallel system

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Table Of Contents

Table of Contents

The components that can only be accessed by opening the protective cover with tools cannot be operated by user.

Only qualified service personnel are authorised to remove such covers.

5.1 Introduction

The LIEBERT APM UPS provides the critical load (such as communication and data processing equipment) with high

quality uninterruptible AC power. The power from the LIEBERT APM UPS is free from voltage and frequency

variations and disturbances (interruption and spike) experienced at the Mains AC input supply.

This is achieved through high frequency double conversion power pulse width modulation (PWM) associated with full

digital signal processing control (DSP), which features high reliability and convenience for use.

As shown in Fig. 5-1, the AC input mains source is supplied at UPS input and converted into a DC source. This DC

source feeds the Inverter that converts the DC source into a clean and input independent AC source. The battery

powers the load through the inverter in case of an AC input mains power failure. The utility source can also power the

load through the static bypass.

When the UPS needs maintenance or repair, the load can be transferred to maintenance bypass without interruption

and the power module and bypass module can be removed for maintenance.

Bat+

Bat N

Bat -

Battery Modules

BCB

LIEBERT APM UPS Module And Parallel System 30kVA~150kVA User Manual