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Operation
Chapter 4
Operation
This chapter describes how to operate the UPS, and includes a short introduction and sections on the 1+N parallel system,
operating mode, battery management, and battery protection.
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.
4.1 Brief Introduction
The UPS provides continuous, high-quality AC power to your critical equipment, such as telecommunications and data processing
equipment. The UPS supplies power that is free of the disturbances and variations in voltage and frequency that are common in
mains power, which is subject to brownouts, blackouts, surges and sags.
The UPS uses the latest high-frequency, double-conversion PWM technology and DSP technology to enhance its reliability and
increase the ease of use.
4.1.1 Operating Theory
As shown in Figure 4-1, the AC mains supply is converted by the rectifier into DC power. The inverter converts that DC power from
the rectifier or the DC power from the battery into AC power, and provides the AC power to the load. The battery supplies the load
through the inverter in the event of a mains failure. The mains source can also supply the load through the static bypass.
If UPS maintenance or repair is necessary, the load can be transferred without power interruption to the maintenance bypass.
User Manual 10H52192UM60 - Rev. 1 - 09/2011
Warning: Hazardous mains and battery voltage present behind covers
STS
Figure 4-1 Operating Theory for UPS Module System (30/40/60 kVA)
Liebert NX
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