Parallel Units Wiring - Delta Ultron Series User Manual

Step 4
Follow Figure 5-20 to ground the UPS, external battery cabinet(s) and connected critical
loads.
5.4.5

Parallel Units Wiring

NOTE:
1. Up to eight UPS units can be paralleled for redundancy and capacity
expansion. Only the UPSs with the same capacity, voltage, frequency and
version can be paralleled. Please only use the provided parallel cable to
parallel the UPS units. Otherwise, parallel functions will fail.
2. When the UPSs are paralleled, the length of each unit's bypass input cables
plus output cables must be the same. This ensures that the parallel UPSs can
equally share the critical loads in Bypass mode.
3 Before wiring, please read 5.4 Wiring thoroughly and make sure relevant
conditions have been met.
The single input parallel wiring procedures is taken as an example.
Step 1
For 300kVA UPS, please follow Step 1 ~ Step 6 in 5.4.4.1 300kVA UPS Single Input (Single
Unit).
For 400/ 500/ 600kVA UPS, please follow Step 1 ~ Step 7 in 5.4.4.3 400/ 500/ 600kVA UPS
Single Input (Single Unit).
Step 2
Connect the cables of the main AC source, output and external battery cabinet(s) to the
UPS. Please refer to Table 5-3, Figure 5-38 and 5.5 External Battery Cabinet Connection
Warnings.
For the wiring diagrams of the 300kVA UPS, refer to Figure 5-17 ~ Figure 5-19.
For the wiring diagrams of the 400/ 500/ 600kVA UPS, refer to Figure 5-26 ~ Figure 5-31.
Ultron DPS Series
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