Parallel Units Wiring - Delta Modulon DPH Series User Manual

5.5.4 Parallel Units Wiring

Single Input (Parallel Units)
When there is only one AC power source, parallel units' wiring procedures are as
follows.
1
2
Modulon DPH Series
NOTE:
1. Only authorized Delta engineers or service personnel can perform installation,
wiring, panel & cover removal, maintenance and operation. If you want to
execute any action mentioned above by yourself, the action must be under the
supervision of authorized Delta engineers or service personnel.
2. Only UPSs with the same capacity, voltage and frequency can be paralleled.
Please only use the provided parallel cable to parallel the UPS units; otherwise,
parallel functions will fail. For UPS parallel information and application, please
contact Delta service personnel.
3. 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.
4. The UPS rating voltage is 120/ 208Vac or 127/ 220Vac.
5. The external battery cabinet's rating voltage is ±168Vdc.
6. Before wiring, please read 5.5 Wiring thoroughly.
Please follow the procedures
Unit).
Connect the main AC source/ output/ external battery cabinet's cables to each
parallel UPS. Please refer to:
Figure 5-13: Single Unit Single Input Wiring Diagram_ Step 1
Figure 5-14: Single Unit Single Input Wiring Diagram_ Step 2
Figure 5-18: Parallel Units Single Input Wiring Diagram
NOTE:
For single input, the UPS will not work normally if the main AC source's
neutral (N).
1 7
~ stated in the section of Single Input (Single
5-18