Delta DPS-400K User Manual page 61

WARNING:
1. When UPSs are paralleled, the length of each unit's input cables plus
output cables must be the same. This ensures that the parallel UPSs can
equally share the critical loads in bypass mode.
2. Only UPSs with the same capacity, voltage and frequency can be paralleled;
otherwise, parallel functions will fail.
3Ø4W
I/P
(Figure 5-14: Parallel Units Single Input Wiring Diagram)
Dual Input (Parallel Units)
When there are two AC power sources, parallel units' wiring procedures are as follows.
1
Follow
into dual input.
2
Follow the procedures
Unit).
Main Input
UPS 1
Main Input
UPS 2
Main Input
UPS 8
1 6
~ stated in the section of Single Input (Single
5-15
5 Installation and Wiring
Output
Parallel Port
Output
Parallel Port
Parallel Port
Output
Parallel Port
to modify the parallel UPSs
3Ø4W
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