Liebert S600 - Connecting Power and Parallel Cables

Vertiv|Liebert® S600 10kVA ~ 20kVA UPS | User Manual 27
3.3 Connecting Power Cables
Each single UPS of the parallel system needs to configure the MCB and cables respectively, refer to 2.4 Connecting
Power Cables for the specification. The recommended configurations of the total power cables are listed in Table 3-1
and Table 3-2 for the parallel system.
3.3.1 Connecting Power Cables
The power cables of the UPS are connected to the I/O terminal block of the rear panel of the UPS, the layout of the I/O
terminal block is shown in 2.6.1 Connecting I/O Cables.
Table 3-1 Input & Output cable CSA for 10 kVA parallel system (unit:mm
2
, ambient temperature: 25 deg C)
Parallel
UPS
number
3-in 1-out
Total input
Phase line
for parallel
system
Total input
neutral
line for
parallel
system
Total output
cable for
parallel
system
Total
grounding
cable for
parallel
system
2 Units
10
35
25
35
3 Units
10
70
50
70
4 Units
16
120
70
120
Table 3-2 Input & Output cable CSA for 20 kVA parallel system (unit:mm
2
, ambient temperature: 25 deg C)
Parallel
UPS
number
3-in 3-out
3-in 1-out
Single
Input cable
for parallel
system
Single
output
cable for
parallel
system
Total
neutral
line for
parallel
system
Grounding
cable for
parallel
system
Total
output
cable for
parallel
system
Total
neutral
line for
parallel
system
Grounding
cable for
parallel
system
2 Units
25
25
25
25
50
50
50
3 Units
35
35
35
35
70
70
70
4 Units
50
50
50
50
95
95
95
3.3.2 Connecting Parallel Cables
The parallel system provides parallel cable option. The parallel cables form a ring connection through the parallel ports
on the rear panel of the UPS. Taking 20kVA model for example, the cable connection schematic diagram of 3 + 1
parallel system is shown in Figure 3-1.