SICK
device
closed current loop with equalizing
currents via cable shield
grounding point 2
grounding point 1
grounding potential difference
e. g. PLC
e. g. sensor
I
U
= metal housing
= shielded electrical cable
Figure 22: Prevention of equipotential bonding currents in the system configuration by the insu‐
lated mounting of the device
Even in the event of large differences in the ground potential, ground loops are effec‐
tively prevented. As a result, equalizing currents can no longer flow via the cable shields
and metal housing.
NOTICE
The voltage supply for the device and the connected peripheral devices must also guar‐
antee the required level of insulation.
Under certain circumstances, a tangible potential can develop between the insulated
metal housings and the local ground potential.
6.3 Wiring notes
NOTICE
Faults due to incorrect wiring.
Incorrect wiring may result in operational faults.
■
For data transmission, use only screened cables with twisted-pair wires.
■
Follow the wiring notes precisely.
NOTE
Preassembled cables can be found online at:
•
www.sick.com/CLV69x
All electrical connections of the device are configured as M12 round connectors or as a
cable with D-Sub-HD male connector. The IP65 enclosure rating is only achieved with
screwed plug connectors or cover caps.
ELECTRICAL INSTALLATION 6
8014396/ZMG8/2017-07-04 | SICK O P E R A T I N G I N S T R U C T I O N S | CLV69x
35
Subject to change without notice
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