SYSTEM DESIGN INFORMATION
11
4.1
ELECTRICAL CHARACTERISTICS
4.1.1
GENERAL
Supply voltage:
20V to 30V dc
Power:
up to 10W (depending on model)
Quiescent current:
-
no camera fitted:
158mA at 24V
-
with camera:
196mA at 24V
Alarm current:
-
no camera fitted:
166mA at 24V
-
with camera:
205mA at 24V
Additional current when using 4 to 20 mA output in source mode
-
Quiescent: 4.0mA
at
24V
-
Alarm: 11.5mA
at
24V
Window heater additional current:
V
Supply
÷
270
Ω (90
m
Α
at 24V)
Stabilisation time after power up:
5 - 20 minutes
4.1.2
RELAY CONTACT OUTPUTS
Fault relay:
Selectable normally closed or open contact.
Alarm relay:
Selectable normally closed or open contact.
Alarm relay coil monitoring:
Supplied as standard.
Contact rating:
2A at 30V dc
4.1.3
4 to 20 mA OUTPUT
Signalling currents:
Nominal
Range
General fault:
0mA
(0.0 to 0.7mA)
Window dirty:
2mA
(1 to 3mA)
Normal:
4.5mA
(3.5 to 5.5mA)
Pre-alarm:
11.5mA
(10 to 13mA)
Alarm:
17mA
(15 to 19mA)
Maximum current monitor resistance
in source mode:
150
Ω
Output mode: Selectable current sink or current source output (SW2).
4-20mA SINK MODE
24V
7.7V
DETECTOR
R MONITOR
100R
R MONITOR 100R-390R
7.7V
DETECTOR
R MONITOR
100R
R MONITOR 100R-120R
0V
4-20mA SOURCE MODE
4-20mA OUTPUT
4-20mA OUTPUT
Fig. 7
4-20mA Current Sink/Source Wiring Diagrams
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