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ID3000 Series Installation & Commissioning Manual
The loop wiring MUST
be disconnected from
the panel during this
procedure.
NEVER connect the
batteries before the
mains supply!
For checking the loop wiring, do the following:
1 Link out any isolators on the loop by temporarily
shorting terminals 2 and 4 on each isolator. The
following tests should then be carried out using a
multimeter.
2 Check the continuity of each leg of the loop and
measure the end-to-end resistance. Verify that it is
less than:
37 ohms to guarantee dual device detection
71 ohms if dual device detection is not required.
3 Using a meter with a diode test facility, connect the
meter in 'reversed' polarity (+ve to loop -ve and -ve to
loop +ve). The meter should indicate the presence of
a number of forward-biased diodes in parallel.
4 Connect the meter in 'normal' polarity (+ve to loop +ve
and -ve to loop -ve). The meter should initially read low
resistance but this should increase as the capacitor in
each of the loop devices charges. If the meter indicates
the presence of a forward-biased diode then it is
probable that one or more of the loop devices is
connected in reversed polarity or the wiring is crossed.
5 If reversed device(s) are indicated in step 4, they may
be located by successive halving of the loop (if the
site layout makes this difficult, the affected section of
the loop can be identified from the panel fault
messages after the system has been configured and
the links in the isolators removed).
6 Use a meter to check that there are no connections
between each cable screen and:
a. The +ve conductor of the cable.
b. The -ve conductor of the cable.
Note: It is recommended that the cable screen is earthed
at the panel only.
7.4.3 Connecting the Loop Wiring to the Panel
When the loop wiring has been checked and found to be
satisfactory, do the following:
1 Remove the temporary links on the isolator units.
2 Connect the loop wiring to the panel. Ensure that the
polarity is correct; the ends nominated as A and B
must be fitted to the correct terminals.
7.4.4 Loop Checks After Connecting Wiring
When the loop wiring has been connected, do the
following:
1 Re-connect the mains power - NEVER connect the
batteries before the mains supply!
2 Check the LCD for indications of any faults. Refer to
Appendix 1 for a list of system fault messages and
possible causes.
47
997-274-000-6, Issue 6
September 2009
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