Parallel Communication Cards; Parallel Ports - Delta DPS Series User Manual

4.1.7

Parallel Communication Cards

The UPS has two parallel communication cards, which are master parallel communication
card and backup parallel communication card. Each card has one LED indicator and two

parallel ports.

If both cards work normally, the master parallel communication card's LED indicator will
illuminate green and the backup parallel communication card's LED indicator will illuminate
yellow.
If one card works normally and the other works abnormally, the normal card's LED indicator
will illuminate green and the abnormal card's LED indicator will illuminate red.
During the initialization process, both cards' LED indicators flash yellow.
(Figure 4-9: Location of the Parallel Communication Cards)
4.1.8 Parallel Ports
The parallel ports are used to connect parallel UPSs to increase system capacity and
redundancy. Up to eight UPS units with the same capacity, voltage, frequency and version
can be paralleled. Please daisy-chain the parallel UPSs with the provided parallel cables only.
Please refer to 5.4.4 Parallel Units Wiring to route the parallel cables.
WARNING:
One parallel cable is provided in each UPS's accessory package. Using non-Delta
parallel cables to parallel the UPSs may cause failure, malfunctions and accidents.
(Figure 4-10: Location of the Parallel Ports)
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