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6
Cable Connections
7
Ground Connections
Effective grounding is crucial to ensure stable Modbus communications and to limit the effects of radio frequency
interference. Ground points are provided inside the back box. In order to prevent false readings or alarms as a result of
ground loops, ensure that the shield of all cables are grounded at a single point, preferably at the controller.
Consideration should also be given to how conduit, glands and the internal earth plate are also grounded.
NOTE
Any earth regime must avoid earth loops.
8
Securing the Detector Module to the Back Box
1. Fit suitable cable glands (included) or conduit fittings to the opened cable entries.
2. Feed the cable through the cable gland.
3. Turn over the detector module and locate the terminal blocks on the back. Remove the
terminal blocks, pulling them toward the center of the module.
4. Connect the cable to the appropriate terminal block, referring to section 2 to 4
depending on the version. Strip and insert the end of each wire into the corresponding
terminal hole, and tighten the terminal screw, using a flat-blade terminal screwdriver
until the wire is secured.
5. Replace the terminal blocks in their correct positions.
1. Remove the front cover from the detector module to expose the retaining screws as
follows:
a) Pull the flap on the bottom side to open it.
b) To unlock the front cover, insert a thin, straight tool, such as a small screwdriver,
into the hole to the right of the tube spigot.
c) While applying slight pressure to the tool, turn the cover counterclockwise until it
stops, and then lift it out.
2
3
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