Parallel Units Wiring - Delta Modulon DPH Series User Manual

5.5.4 Parallel Units Wiring

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. 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
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.
5. The external battery cabinet's rating voltage is ±240Vdc.
6. Before wiring, please read
conditions have been met.
Single Input (Parallel Units)
When there is only one AC power source, parallel units' wiring procedures are as
follows.
1
Follow the procedures
2
Connect the cables of the main AC source, output and external battery cabinet(s)
to the UPS. Please refer to the following to perform wiring.
. Please only use the provided parallel cable to parallel the
Input Distribution Panel
1. L1 ~ L4: Length of Wiring Cable
2. L1 + L3 = L2 + L4 = ...
L1
L2
.
L3
UPS1
L4
UPS2
Output Distribution Panel
thoroughly and make sure relevant
1 8
~ stated in the section of
5-19
5 Installation and Wiring