Chapter 1 Overview 5
NX UPS Single Module And Parallel System 250kVA ~ 800kVA User Manual
Bypass
power supply
Rectifier
Inverter
Static switch
Static switch
DC bus
UPS
output
Battery
BCB
Four switch option
Bypass switch Q2
Output
switch Q5
Mains input
Maintenance switch Q3
Mains
switch Q1
UPS
Four switches option
Main input
Figure 1-5 UPS power supply switch configuration (500kVA ~ 600kVA E with four switches)
600kVA~800kVA
There are four switches: Q1, Q2, Q3, and Q5. The switch Q3 is an option, that is, two configurations are available for
selection: with Q3 or without Q3.
The 600kVA ~ 800kVA UPS supports two configurations: rectifier and bypass adopt two-route mains input, rectifier
and bypass adopt one route input. The cabinet with Q3 supports maintenance mode (see
1.4 Operation Mode
)
while without Q3 does not support maintenance mode..
Figure 1-6 describes the block diagram of the UPS in split bypass configuration (that is, the bypass adopts
independent mains input). In split bypass configuration, the static bypass and maintenance bypass share the same
independent bypass power supply. Where a separate power source is not available for the bypass, the output of
bypass switch Q2 and the main input Q1 should be linked to make the bypass input and rectifier input share the same
mains power source.
Note: The main input and bypass input use the same neutral line.
Battery
BCB
Bypass
power supply
Mains input
Maintenance switch Q3
Bypass switch Q2
Main input
switch Q1
Static switch
Rectifier
Inverter
Static switch
DC bus
Output
switch Q5
UPS
output
UPS
Common input assembly/
cable/copper bar
Figure 1-6 UPS power supply switch configuration (600kVA ~ 800kVA)
1.2.5 BCB
The UPS provides a mandatory BCB. The external battery must be connected to the UPS through the BCB. The BCB
provides overcurrent protection, short circuit protection and automatic tripping functions. Please install the BCB near
the battery.
1.3 Parallel System
Up to four UPS modules can be parallel-connected to form a parallel system to increase the system capacity or
reliability, or both. The load is equally shared between the paralleled UPS modules.
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