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
8 6
5
21 3
4
7
= 9
= ß
Figure 15: Example: Prevention of equipotential bonding currents in the system configuration by
the insulated mounting of the device
1
System controller
2
Device
3
Voltage supply
4
Grounding point 3
5
Insulated mounting
6
Grounding point 2
7
Ground potential difference
8
Grounding point 1
9
Metal housing
ß
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.
6.1.2 Notes on electrical installation
Connection work
•
Standard safety requirements must be observed when working on electrical sys‐
tems!
•
Electrical installation must only be performed by electrically qualified personnel.
•
Select all cables to suit the ambient temperature range at the installation site.
6 ELECTRICAL INSTALLATION
38
O P E R A T I N G I N S T R U C T I O N S | RFU63x 8027750//2022-12-15 | SICK
Subject to change without notice
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