RayTek MI3 Operating Instructions Manual page 22

Basics
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 9: Only one point is earth grounded either via sensing head, via Comm Box, or via Power
22
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Figure 7: Shield Run for Comm Box (metal)
Figure 8: Shield Run for Comm Box (DIN)
Head Box
Shield
Rev. F1 05/2013
Power
Shield
MI3
1.800.868.7495