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Chapter 3 Operations
This chapter introduces the basic knowledge of UPS operations, including working principle,
operation mode, battery management and protection.
Warning: Hazardous mains voltage and/or battery voltage present(s) behind the
protective cover
1
．
The components that can only be accessed by opening the protective cover with tools cannot be
operated by user.
2
．
Only qualified service personnel are authorized to remove such covers.
3.1 Introduction
UPS provides high quality uninterruptible AC power to your critical load. The power from 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.
3.1.1 Principle
As shown in fig 3-1, 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 3-1 System principle framework
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