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SERIES 3000 MKII TECHNICAL MANUAL
6.1 Detector wiring schematic
Caution: All electrical connections should be made in accordance with any
relevant local or national legislation, standards or codes of practice.
V
V
V
c
c
c
Diagram 7: Wiring Schematic Type 1
Controller
Controller
+VE
+VE
R
R
L
L
Signal
Signal
V
V
c
c
-VE
-VE
Diagram 8: Wiring Schematic Type 2
6.2 Typical maximum installed cable lengths
The formula for calculating the maximum installed cable length between a controller and detector D
(meters) is given below.
Typical cable data
Cable size
0.5mm2 (20AWG*)
1.0mm2 (17AWG*)
1.5mm2 (16AWG*)
2.0mm2 (14AWG*)
*Nearest equivalent
Notes:
•
Distance km=kilometres, mi=miles.
•
Assuming Vc=24Vdc, Vdmin=17Vdc, Im=22mA
For the value of RC, use the data supplied by the manufacturer of the cable to be used for the
specific installation.
R
R
R
c
c
c
I
I
I
m
m
m
R
R
c
c
+VE
+VE
1
1
1
1
I
I
m
m
-VE
-VE
2
2
2
2
D = ( ( ( Vc - Vdmin - ( Im * RL ) ) / ( 2 * Im * Rc ) ) ) * 1000
Cable resistance
Rc Ω/km (Ω/mi)
36.8 (59.2)
19.5 (31.4)
12.7 (20.4)
10.1 (16.3)
Detector Supply V
•
17Vdc (+/-10%) < V
V
V
V
d
d
d
Maximum Detector Signal I
•
I
= 22mA (over range)
m
Cable Resistance R
•
Subject to cable type
•
Typical values are:
Detector
Detector
Load Resistor of Control Panel R
•
Assumed 33Ω (min) / 250Ω (max)
V
V
d
d
Controller Supply Voltage V
Subject to controller manufacturer
•
•
Assumed nominal of 24Vdc
Cable distance km (mi)
Example 1 Input
impedance RL = 33Ω
3.9 (2.4)
7.3 (4.5)
11.2 (7.0)
14.1 (8.8)
12
S3KMKIIMAN_MAN0878_Issue 8_08/2015
d
< 32Vdc (max)
d
m
c
2
0.5mm
(20AWG*) = 36.8Ω/km (59.2Ω/mi)
2
1.0mm
(17AWG*) = 19.5Ω/km (31.4Ω/mi)
2
1.5mm
(16AWG*) = 12.7Ω/km (20.4Ω/mi)
2
2.0mm
(14AWG*) = 10.1Ω/km (16.3Ω/mi)
*nearest equivalent
L
c
Example 2 Input
impedance RL = 250Ω
0.9 (0.6)
1.7 (1.1)
2.7 (1.7)
3.4 (2.1)
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