The use of electro-optical signal isolators between the islands isolates the ground loop.
Within the islands, a stable equipotential bonding prevents equalizing currents on the
cable shields.
Measures for small system installations
For smaller installations with only slight potential differences, insulated mounting of the
device and peripheral devices may be an adequate solution.
U
System
Controller
Power Supply
SICK
Device
9
7
6
3
1
4
5
8
=
ß
=
à
Databus
2
Databus
2
Figure 23: Example: Prevention of equipotential bonding currents in the system configuration by
the insulated mounting of the device
1
System controller
2
Data bus
3
Device
4
Voltage supply
5
Grounding point 3
6
Insulated mounting
7
Grounding point 2
8
Ground potential difference
9
Grounding point 1
ß
Metal housing
à
Shielded electrical cable
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
guarantee the required level of insulation.
Under certain circumstances, a tangible potential can develop between the insulated
metal housings and the local ground potential.
6.1.3
Instructions for electrical installation when the ambient temperature can fall below 0 °C
NOTE
For mounting instructions,
see "Instructions for mounting the device when the ambient
temperature can fall below 0 °C", page 30
.
6
ELECTRICAL INSTALLATION
42
O P E R A T I N G I N S T R U C T I O N S | CLV61x DualPort (PROFINET)
8017842/19XD/2021-11-19 | SICK
Subject to change without notice
