Leuze electronic CML 720i Ex Operating Instructions Manual page 49

NOTICE
Star-shaped cable connections!
 Ensure that the devices are connected in a star-shaped arrangement.
You thereby avoid mutual influences from various loads.
This prevents cable loops.
Grounding the light curtain housings
 Connect the transmitter housing and receiver housing of the light curtain to the protective conductor on
the FE machine star point via the PE screw on the grounding slot nut (see figure 7.1).
The cable should have an impedance as low as possible for high-frequency signals, i.e., be as short as
possible and have a large cross-sectional area (grounding strip, ...).
 Use a lock washer and check the penetration of the anodized layer.
 Check the small Allen screw to ensure a secure connection between the grounding slot nut and housing.
The Allen screw is correctly tightened upon delivery from the factory.
If you have changed the position of the grounding slot nut or the PE screw, tighten the small Allen screw.
Figure 7.1: Connecting the ground potential to the light curtain
Example for shielding both ends of the connection cables from the switch cabinet to the light curtain
 Ground the transmitter housing and receiver housing of the light curtain (see chapter "Grounding the
light curtain housings").
 Clamp the shield in the switch cabinet flat to FE (see figure 7.2).
Use special shielding terminals (e.g., Wago, Weidmüller, ...).
Figure 7.2: Connecting the cable shielding in the switch cabinet
Leuze electronic CML 720i Ex
Electrical connection
49