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‐
t
ively prevented. As a result, equalizing currents can no longer flow via the cable shields
and metal housing.
NOTICE
T
he 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.
6.2 Wiring instructions
NOTE
Pr
e-assembled cables can be found online at:
•
www.sick.com/GLS6
NOTE
Pr
e-assembled cables with open cable end at one end:
Information about pin, signal and wire color assignments can be found in the appendix,
see "Signal assignment of cables with open cable end at one end", page 57.
NOTICE
F
aults during operation and device or system defects!
Incorrect wiring may result in operational faults and defects.
■
Follow the wiring notes precisely.
The enclosure rating stated in the technical data is achieved only with screwed plug
connectors or protective caps.
Configure the circuits connected to the device as ES1 circuits or as SELV circuits (SELV
= Safety Extra Low Voltage). The voltage source must meet the requirements of ES1
and PS2 (EN 62368-1) or SELV and LPS (EN 60950-1).
Protect the device with an external slow-blow fuse at the beginning of the supply cable.
The required fuse r
ating is 2 A slow-blow.
Connect the connecting cables in a de-energized state. Do not switch on the supply volt‐
age until installation is complete and all connection work on the device and controller
has been finished.
Perform all connection work only at ambient temperatures above 0 °C.
Connect the device only to the permissible supply voltage, see "Connecting the supply
voltage", page 34.
Wire cross-sections in the supply cable from the customer’s power system must be
implemented in accordance with the applicable standards.
ELECTRICAL INSTALLATION 6
8026021//2020-12-18 | SICK O P E R A T I N G I N S T R U C T I O N S | GLS611
31
Subject to change without notice
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