Installation
2106M0525 Iss 2 Nov 05 15
Power
The toxic detector requires a power supply of 16-30 Vdc (at up to 30 mA). Ensure that a minimum
supply of 16 Vdc is measured at the detector, taking into account the voltage drop due to cable
resistance. For example, the nominal DC supply at the control panel has a guaranteed minimum
supply of 18 Vdc. The maximum cable voltage drop allowed is therefore 2 Vdc.
The flammable detector requires 2.9 Vdc to 3.5 Vdc bridge (at 200 mA).
Refer to the control panel manual for allowable maximum cable lengths.
Wiring
Caution An earth point is provided inside the controller. Ensure that all
detector screens/armor are grounded at a single earth star point at
the detector or controller — BUT NOT BOTH — to prevent false
alarms due to earth loops.
All connections are made via the terminal block inside the detector housing.
1 Open the enclosure lid.
Unscrew the four M4 captive securing hex. screws, using a 4 mm (0.16 in.) A/F hex key
wrench. The lid is attached to the base by a retaining hinge. Lift the lid vertically away from
the enclosure base and then tilt it away from the base.
2 Terminate the field wiring.
Cautions All conductors must be fully tightened down within the terminals.
Conductor tightening screws must be below the surface of the
terminal and it is important that the correct sized screwdriver is used.
An oversized screwdriver will break the insulation around the
terminal.
The enclosure is fitted with an earth continuity plate and internal and
external earth studs. A suitable ring-type terminal lug must always be
used to secure the earth conductor.
See the following diagrams for connection details.
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