14
PRS-UM-DP4-EN-Rev.03-05.06.2020
Detectors Connections
Panel can be connected and monitor 8 detectors with standard 4-20mA inputs signal. V+, V-
(GND) and S ports must be connected via using three-wire cable. Detector connections
supply 24VDC power to detector and read the output signal of detector from S port. Thus
connections should be made correctly to do not cause any damage on the detectors.
Detectors should be connected with three-wire 0.5mm
2
cross section cable. Cable diameter
will be increased while distance increase between the panel and detectors. Recommended
cable types per distance are given in table 6:
Cable size
Cable type
Cable resistance
Maximum Cable length (L)
(cross sectional area)
nearest equivalent
Ω/km
Meters
0.5mm2
20AWG
36.8 Ω/km
400
1.0mm2
17AWG
19.5 Ω/km
750
1.5mm2
16AWG
12.7 Ω/km
1000
2.0mm2
14AWG
10.1 Ω/km
1250
2.5mm2
13AWG
8.0 Ω/km
1500
Table
7:
Typical cable details and maximum distance for cabling
Detector connections should be made with 3 core cable and pin definitions are as follows:
S
4-20mA signal
-
GND (V-)
+
Supply (V+)
Table
8: Connection pin definitions
The panel is programmed as all channels in operation and connected to detectors. In case
less than 8 detectors used the system will raise fault status for unused channels and overall
panel status remain in fault status. In this case user should close (deactivate) unused
channels via using configuration menu steps.
Relay Outputs
S-DP4 panel has four relay outputs which are ALARM1, ALARM2, FAULT and AUX. Relay
connection ports are located right under the relays. Alarm relays are operating in latched
mode. Hence the panel will wait user intervention to clear alarm status even conditions
returned to normal. User should reset status via pressing Exit button to acknowledge any
alarm. The active relays can also be monitored via related LEDs on the panel. Relay details
and activation rules are given below:
ALARM1:
This relay will be activated when any of the detectors in the system will exceed the
programmed Alarm-1 level threshold. If there is oxygen detector used in the system,
ALARM1 is also used as the low oxygen level alarm.
ALARM2:
This relay will be activated when any of the detectors in the system will exceed the
programmed Alarm-2 threshold level. If there is oxygen detector used in the system,
ALARM2 is also used as the high oxygen level alarm.
FAULT:
This relay will be activated when any of the detectors in fault status or any panel self
test function fails. The Fault LED will be activated when line power lost and system runs with
