Parallel Units Wiring - Delta DPH Series User Manual

5.4.4

Parallel Units Wiring

NOTE:
1. Up to three 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 that relevant
conditions have been met.
Step 1
For single input, follow Step 1 ~ Step 6 mentioned in 5.4.3.1 Single Input (Single Unit).
For dual input, follow Step 1 ~ Step 3 mentioned in 5.4.3.2 Dual Input (Single Unit).
Step 2
Use the provided parallel cables*
adopt the Daisy Chain method shown in the figure below. For the parallel port location, refer
to Figure 4-1.
NOTE:
1
* One parallel cable is provided in each UPS's accessory package.
1
to connect the parallel ports of the parallel units. Please
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