Chapter 3 Parallel UPS Installation And Commissioning 27
Liebert
®
ITA 5kVA And 6kVA UPS User Manual
UPS
UPS
UPS
Battery module
UPS
3 + 1 parallel POD
Battery module
Battery module
Battery module
Figure 3-38 Installation of the 3 + 1 parallel system with battery modules
3.4 Connecting Cables
In the UPS parallel system, each single UPS needs to configure the MCBs and power cables respectively, refer to
Table 2-3 and Table 2-4 for the specifications.
3.4.1 Connecting I/O Cables
There are two modes for UPS parallel power distribution: using the parallel POD (optional) provided by Emerson and
self-distribution.
According to the user requirements, the I/O cable connections are divided into two types: 1-in 1-out (default) and 3-in
1-out.
Using the parallel POD power distribution
In the UPS parallel system, it is recommended to use POD provided by Emerson to perform power distribution. Refer
to
Liebert
®
ITA 5kVA And 6kVA UPS Parallel Power Distribution Unit User Manual
for the power cable connection.
Self-distribution
The block diagram of four-UPS parallel system is shown in Figure 3-2. Refer to
2.5.1 Connecting I/O Cables
for the
cable connection of each UPS. When using the self-distribution, refer to Table 2-3 and Table 2-4 for the selection of the
MCBs and power cables.
UPS1
UPS2
UPS3
Input cable
Output cable
User input power
distribution unit
UPS4
User output power
distribution unit
Figure 3-39 Block diagram of four-UPS parallel system