Chapter 6 Operating Instructions
42
MUST400_User manual_EN_REV02 User Manual
Chapter 5 Operations
Warning: Hazardous mains voltage and/or battery voltage
present(s) 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 authorized to remove such covers.
5.1 Introduction
The Modular UPS system provides the critical load (such as communication and data processing equipment)
with high quality uninterruptible AC power. The power from the UPS is free from voltage and frequency
variations and disturbances (interruption and spike) coming from AC mains input supply.
This is achieved through high frequency double conversion power pulse width modulation (PWM) associated
with fully 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 in UPS input and converted into a DC source.
This DC source feeds the inverter that converts the DC source into a clean and pure sinewave independent
AC source.
The battery powers the load through the inverter in case of an AC input mains failure. The input mains can
also supply the load through the static bypass.
When the UPS needs maintenance or repairing activity, the load must to be transferred to maintenance bypass
without interruption and the power module and bypass module can be removed for maintenance without any
interruption.
REC
INV
BAT
CHARGER
REC
INV
BAT
CHARGER
BCB
Battery Module
BCB
bA
bB
bC
mA
mB
mC
mN
Batt+
BattN
Batt-
oA
oB
oC
oN
Power Module 1#
Power Module 10#
Bypass Module
Maintenance Bypass
Fig.5- 1: Single Unit Block Diagram
警告
危 险
