Parallel Unit Wiring - Delta Modulon DPH series User Manual

4

5.5.4 Parallel Unit 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:
For dual input, the UPS will not work normally if the main AC power's
or not connected to the UPS's AC Input neutral (N) terminal and Bypass
Input neutral (N) terminal respectively.
Follow Figure 5-19 to ground the UPS, external battery cabinet(s) and connected
critical loads.
WARNING:
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. Up to eight UPS units can be paralleled for redundancy and capacity
expansion. Only the UPSs with the same capacity, voltage, frequency, version
and serial No. can be paralleled. For version and serial No. information, please
refer to 7.11.7 Version & S/N. Please only use the provided parallel cable to
parallel the UPS units. Otherwise, parallel functions will fail.
3. 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.
4. The UPS's rating voltage is 220/ 380Vac, 230/ 400Vac, or 240/ 415Vac; the
external battery cabinet's rating voltage is ±240Vdc.
5. Before wiring, please read 5.5 Wiring thoroughly and make sure relevant
conditions have been met.
Please follow the procedures
Unit).
Connect the cables of the main AC source, output and external battery cabinet(s) to
the UPS. There are two types of wiring, top wiring and bottom wiring. Please refer to
the following to perform wiring
1 6
~ stated in the section of Single Input (Single
5-22