Parallel Communication Cards; Parallel Ports - Delta Modulon DPH 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. Please
see Figure 4-11 for their location.
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.
DISPLAY
EXT. BATT EXT.SWITCH
TEMP. STATUS
BT1 BT2 S1 S2
REPO
NC NO
BT3 BT4
S3 S4
(Figure 4-11: Location of Parallel Communication Cards and Their LED Indicators)

4.1.8 Parallel Ports

The parallel ports are used to connect parallel UPSs to increase the system capacity and
redundancy. With the provided parallel cable, UPS units with the same capacity, voltage
and frequency can be paralleled. To enhance parallel reliability, please adopt Daisy Chain
method (see Figure 5-18 & Figure 5-20
WARNING:
1. The provided parallel cable is placed in the accessory package. Using other
2. For UPS parallel information and application, please contact Delta service
Backup Parallel
Communication
Card's LED Indicator
O/P DRY I/P DRY
CONTACT CONTACT
P1 P2 P3 P1 P2
PARALLEL
P4 P5 P6 PARALLEL
P3 P4
Master Parallel
Communication
Card's LED Indicator
types of cables to connect the parallel UPSs may cause parallel failure,
malfunctions and accidents.
personnel.
Backup Parallel
Communication Card
USB
Master Parallel
Communication Card
4-11
4 Communication Interfaces
RS-232
BATT.
START
BATT.
START