Parallel system cabling
Figure 22: Principle of paralleled UPS systems
A Bypass inputs to UPSs 1 UPS 1 7 Battery
B Outputs from UPSs 2 UPS 2 8 Battery
C Load 3 UPS 3 9 MOB1
4 UPS 4 10 MOB2
5 Battery 11 MOB3
6 Battery 12 MOB4
The required parallel system wiring length must be equal to ensure approximately
equal current sharing when in the bypass mode.
For proper operation, the following must be true: 1A+1B=2A+2B=3A+3B=4A+4B.
Any differences in wire length result in decreased capacity and improper
operation of the UPS system while in the bypass mode.
© Eaton Corporation plc 2020. All rights reserved. Revision: 006 Document ID: P-164000493 72 (126)
Eaton 91PS/93PS UPS 8–40 kW User’s and Installation Guide
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