Chapter 4 Operations 37
LIEBERT APM UPS Module And Parallel System 30kVA~150kVA User Manual
Chapter 5 Operations
Warning: Hazardous mains voltage and/or battery voltage present behind the protective cover
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.
Fig.
5-1:
Single unit block diagram
#5 Power Module
Optional
Inductors
oA
oB
oC
oN
mA
mB
mC
mN
bA
bB
bC
bN
Bat+
Bat N
Bat -
Charger
Charger
Maintenance Switch
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