5-23
5
Installation and Wiring
5.5.4 Parallel Unit 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 expan-
sion. 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.
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 220/ 380Vac, 230/ 400Vac or 240/ 415Vac.
5. The external battery cabinet’s rating voltage is ±240Vdc.
6. Before wiring, please read 5.5 Wiring thoroughly.
y
Single Input (Parallel Units)
When there is only one AC power source, parallel units’ wiring procedures are as follows.
1
Please follow the procedures
1
~
8
stated in the section of Single Input (Single
Unit).
2
Connect the main AC source, output and external battery cabinet’s cables to each
UPS. There are two types of wiring, top wiring and bottom wiring. Please refer to
the following.
Figure 5-16: Single Unit Single Input Top Wiring Diagram_ Step 1
Figure 5-17: Single Unit Single Input Top Wiring Diagram_ Step 2
Figure 5-18: Single Unit Single Input Bottom Wiring Diagram_ Step 1
Figure 5-19: Single Unit Single Input Bottom Wiring Diagram_ Step 2
Figure 5-25: Parallel Units Single Input Wiring Diagram
5.6 External Battery Cabinet Connection Warnings
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