6.5.4 Parallel Units Wiring - Delta Ultron HPH Series User Manual

6.5.4 Parallel Units Wiring

NOTE:
Single Input (Parallel Units)
When there is only one AC power source, parallel unit's wiring procedures are as follows.
1
Please follow steps
2
Connect the main AC source/ output/ external battery cabinet cables to the wiring ter-
minal block (please refer to Figures 6-9~6-11/ 6-18).
NOTE:
1. Regarding Figure 6-9~6-11
2. When the utility AC power is the TN system, a 3-pole protective device and a
3. When the utility AC power is the TT system, a 4-pole protective device and a
3
Use the provided parallel cable to connect the parallel ports on the parallel units.
Please see Figure 5-1 for parallel port location.
4
Please refer to Chapter 5 : Communication Interfaces to set the parallel switch in
the ON or OFF position.
5
Ground the parallel UPSs.
Prior to wiring, please read 6.5.1 Precautions Prior to Wiring
1
is the TN system and a 3-pole protective device is installed between the UPS
and the utility AC power. If your utility AC power is the TT system, please in-
stall a 4-pole protective device between the UPS and the utility AC power.
3-pole contactor must be installed between the UPS and the utility AC power.
4-pole contactor must be installed between the UPS and the utility AC power.
WARNING:
1. When UPSs are paralleled, the length of each unit's input cables/ output ca-
bles must be equal. This ensures that the parallel UPSs can equally share the
equipment loads in bypass mode.
otherwise, parallel functions will fail.
2 or 3) through LCD. Otherwise, UPSs can not be started. If the symbol '!' ap-
5
stated in section Single Input (Single Unit).
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Chapter 6 Installation and Wiring