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Note
When using remote power supply units the connection between
the control panel and the power unit represents a single supply.
The a.c. mains supply should be via an isolating switch fuse, coloured red and labelled "FIRE
ALARM DO NOT SWITCH OFF". The switch should be secure from unauthorised use.
Should a mains unit be fitted within a control panel it is essential that the panel is correctly
bonded to earth and that the incoming mains cable does not utilise the same access point as
the detection cables.
Once the cable is terminated into the control panel it is essential that the cable is physically
segregated from all components and wiring, along it's route to the transformer.
External Panel Connections
All external connections are detailed on the terminal layout which is supplied with the panel.
Smallest and largest cross sectional area of conductors for terminals:
ALL PCBs: 0.5 to 2.5 mm²
240 V a.c: 1.0 to 2.5 mm²
4.7
LOOP WIRING TESTS
Do not Megger any circuitry once bases/devices are installed
as this could seriously damage the equipment.
When all bases are connected but before any devices are installed, the following tests should
be carried out:
1.
Loop short-circuit.
Using an ohmmeter, check for a short-circuit between +ve and -ve feeds.
2.
Loop open-circuit.
Check continuity of the +ve and -ve leads.
3.
Loop short to earth.
Check using an ohmmeter between the +ve and -ve leads and an earth
connection. A reading greater than 20 MΩ should be obtained.
TM0064
Failure of either the positive or negative lead will result in
complete loss of power to the control panel.
CAUTION
Page 76 of 91
Issue 2.01
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