Wiring
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4 Wiring
4.1 Cabling Suggestions
4.1.1 Grounding Requirements
A grounding point ( ) is set on the power terminal of the controller and the rear earhook each.
Choose one of the grounding points as needed, but the grounding point on the rear earhook is
recommended. Ground the controller using a grounding wire that is as thick and short (less than 30
cm) as possible.
Use a wing nut for grounding, with a tightening torque of 0.55 N.m to 0.8 N.m, as shown below:
1-Wing nut; 2-Grounding cable; 3-Grounding screw
Figure 4-1 Grounding
Grounding of shielded cables
Communication cables must be shielded cables. Ground the shielded cable as close to the controller
as possible so that the cable is not interfered with by electromagnetic induction. The exposed shielded
cable must touch the grounding point as much as possible to ensure good contact.
Do not solder a PVC wire to the shielded cable for grounding because this will increase the high
frequency impedance and attenuate the shielding effect. The communication cable must be grounded
at both ends.
Figure 4-2 Grounding a shielded cable
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