AKI-CDB-MOD-07T | ADDITIONAL INSTALLATION TIPS
7.2
Ethernet Connection in the Operator Panel
1
2
3
4
5
RJ45
RJ45
RJ45
RJ45
RJ45
RJ45
RJ45
RJ45
Industrial Ethernet
Operator panel
Operator panel
Operator panel
Operator panel
Shielded
Short and
unshielded
0.1
μ
F
250 V
1-1
3-3
8-8
2-2
In some industrial units for Ethernet, the RJ45 contact’s shield is connected to the chassis via a
capacitor, see 1 in drawing above.
The operator panel’s Ethernet shield is directly connected to the chassis, see 2 in drawing above.
1. Check whether the other Ethernet unit has its shield directly grounded or grounded via a capacitor.
Note:
In many cases, connecting the shielded Ethernet cabling to the chassis at both ends is inappropriate. Hum or
grounding loops can occur. Unshielded cabling may even result in fewer communication errors.
A good solution may be to use a shielded Ethernet cable, but to connect the shield at one end only.
One option is to break the shield, see 3 in drawing above.
A more elegant method is to expand the shielded Ethernet cabling with a piece of unshielded Ethernet
cable, see 4 in drawing above.
The shield can be grounded via an external 0.1 µF/250 V plastic capacitor, see 5 in drawing above.
This will connect the HF transients to ground.
ky
Kollmorgen | October 2014
19
