Eaton 9SX 20KPM Series - Page 39

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Parallel system installed by 20KVA UPS (conductor cross-section, unit: mm²)
UPS
number
Mode
Main input
Bypass
input
Ground wire
Output
Battery wire
Battery Ground
L wire
N wire
L wire
N wire
L wire
N wire
Ground
2 UPS
3-1
25
25
70
70
70
70
70
70
35
35
3-3
25
25
16
16
25
16
16
16
35
35
1-1
120
120
70
70
120
70
70
70
35
35
1-3
120
120
16
16
120
16
16
16
35
35
3 UPS
3-1
50
50
150
150
150
150
150
150
70
70
3-3
50
50
25
25
50
25
25
25
70
70
1-1
240
240
150
150
240
150
150
150
70
70
1-3
240
240
25
25
240
25
25
25
70
70
Note:
1. For single input connection, please select the larger conductor size cross-section.
2. If the load in a 3-phase output mode is unbalanced, the L wire of the bypass and
output may exceed the rated current by 1.732 times. . The corresponding
protection device and wiring cable must be determined according to the
standards of the region and the actual situation of the user.
5.2.1 Basic parallel UPS wiring
Complete the AC connection for the parallel system per the previous section.
Remove the protective cover of the parallel ports, then connect the ‘parallel cable’
(25-pin included as an accessory) to each UPS’ parallel port. The connection
should be a closed loop (as shown below):