Emerson Liebert ITA - Connecting Battery Cables

Chapter 3 Parallel UPS Installation And Commissioning 31
Liebert
®
ITA 16kVA And 20kVA UPS User Manual
Warning
1. The default setting of the DIP switch is ‘1’. However, you should set the DIP switch position for the parallel system according to
the descriptions listed in Table 3-2. Otherwise, a UPS fault will occur.
2. The parallel address for each UPS must be unique.
3.4.3 Connecting Battery Cables
All the UPSs in the parallel system can either share the battery strings, or use the battery strings independently.
Note
Each UPS should be equipped with an independent battery MCB. Refer to Table 2-4 for selection of the battery MCB.
Using battery string independently
When each UPS of the parallel system uses the battery string independently, the battery cables connection of each
UPS in the parallel system is the same with that of the single UPS, refer to 2.5.2 Connecting Battery Cables for the
installation method. The schematic diagram of battery strings in 1 + 1 parallel system with independent battery strings
is shown in Figure 3-4. Refer to 2.5 Connecting Power Cables to configure a 4P MCB.
Note
Make sure that the LCD settings are correct when using the battery strings independently for the parallel system, refer to
3.5.2 Parallel System Parameters Settings for details.
＋
－
First cell
Bat +
Bat N
Bat -
Battery string 1
＋
－
＋
－
＋
－
＋
－
＋
－
＋
－
＋
－
……
……
＋
－
Bat +
Bat N
Bat -
＋
－
＋
－
＋
－
＋
－
＋
－
＋
－
＋
－
……
……
Parallel cable
Battery string 2Battery string 3Battery string 4
Second cell Third cell Sixteen cell
First cell Second cell Third cell Sixteen cell
First cell Second cell Third cell Sixteen cell
First cell Second cell Third cell Sixteen cell
UPS1
UPS2
Figure 3-4 Connection principle diagram upon using battery strings independently