Basics
MI3 Rev. G Nov/2015 25
To avoid ground loops, make sure that only one point is earth grounded, either via the
sensing head, the Comm Box, or power.
Please note that:
The metal housings of the sensing head and the MI3 communication box are electrically
connected to the shield of the head cable.
All inputs and outputs (except the alarm output and the outputs of the Comm Box (DIN 6TE,
analog)) use the same ground and are electrically connected to the power supply.
Figure 7: Shield Run for Comm Box (metal)
Figure 8: Shield Run for Comm Box (DIN)
Figure 9: Only one point is earth grounded either via sensing head, via Comm Box, or via Power
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