NSC Sicherheitstechnik GmbH
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14.08.2013
Lange Wand 3
B01050 B01060 Operating Installation Manual Solution F1 20130814.doc
33719 Bielefeld
Version S040A13.08
Checking the wiring system
Before checking the wiring system you should disconnect all cables from the fire control panel by
removing the pluggable terminals.
Measure end of line resistors of conventional zones (without voltage)
6k8 (±10%) end of line resistor measurable on each conventional zone?
Ο
Fault
check wiring and end of line resistor.
Ο
ok
plug terminals in fire control panel
Measure cable resistance of loop wiring (without voltage)
If isolators are installed on the loop you only can measure the resistance of the minus wire.
You have to measure the cable resistance of each loop. The minimum operating voltage for each
loop device will be calculated from the cable resistance and the loop current, which has to be
measured later.
The resistance of the shielding also has to be written down in the following table. Additionally this
measurement guarantees that the shielding isn’t interrupted in any loop device. As long as the
shielding hasn’t been connected to earth in the FCP there must not be any other connection to
earth potential (e.g. in a detector base).You can check this by measuring the resistance between
the shielding and earth potential.
Loop card
Loop
ML-Wire
[
Ω
}
Shielding
[
Ω
]
Wiring without
earth fault
1
1
(ML-1-/ML-2-)
yes no
1
2
(ML-5-/ML-6-)
yes no
2
3
(ML-1-/ML-2-)
yes no
2
4
(ML-5-/ML-6-)
yes no
3
5
(ML-1-/ML-2-)
yes no
3
6
(ML-5-/ML-6-)
yes no
4
7
(ML-1-/ML-2-)
yes no
4
8
(ML-5-/ML-6-)
yes no
5
9
(ML-1-/ML-2-)
yes no
5
10
(ML-5-/ML-6-)
yes no
6
11
(ML-1-/ML-2-)
yes no
6
12
(ML-5-/ML-6-)
yes no
7
13
(ML-1-/ML-2-)
yes no
7
14
(ML-5-/ML-6-)
yes no
8
15
(ML-1-/ML-2-)
yes no
8
16
(ML-5-/ML-6-)
yes no
9
17
(ML-1-/ML-2-)
yes no
9
18
(ML-5-/ML-6-)
yes no
If the cable resistance is correct please plug the terminals in the FCP.
