To Achieve Better Emc Protection - Beijer Electronics X2 control 10-B2 Hardware And Installation Manual

Additional Installation Tips
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 film capacitor, see 5 in drawing above. This
connects the HF transients to ground.

7.3. To Achieve Better EMC Protection

• Initially, use the original cabling from Beijer Electronics primarily.
• Place the 24 V DC and communications cabling in one cable trunk/cable duct and 230/380 V AC in
another. If the cables need to be crossed, cross them at 90° only. Avoid combining the cabling for
stronger 24 V DC outputs with the communication cabling.
• Use shielded cables for RS-232 communication.
• Use twisted pair and shielded cabling for RS-422 and RS-485.
• Use the cabling intended for the bus type; Ethernet, Profibus, CC-Link, CAN, Device Net etc.
• Install and connect according to applicable specifications for the relevant bus standard.
• Use shielded cabling for Ethernet, preferably with foil and a braided shield.
• D-sub covers should be shielded, and the shield should be connected to the cover 360° where the
cable enters.
• Connect the shield at both ends.
Ground plane 1
Not same potential
Ground plate
With longer distances, there is a risk that the ground potential may be different. In that case, the
shield should only be connected at one end. A good alternative is to connect the other end of the
shield to the ground via a 0.1 μF / 250 V film capacitor. Both ends are then connected to the ground
in terms of HF, but only connected to the ground at one end in terms of LF, thus avoiding the 50/60
Hz grounding loops.
Metal cabinet
Terminal or connector
EMC cable gland
Shielded cable
1. Use an EMC cable gland or regular plastic cable gland, remove the outer jacket and connect the
shield to the installation plate with a 360° metal cable clamp.
2. Place the 24 V DC and communications cabling in one cable trunk/cable duct and 230/380 V AC
in another. If the cables need to be crossed, cross them at 90° only. Avoid combining the cabling
for stronger 24 V DC outputs with the communication cabling.
2024-01
Shielded cable
0.1 µF/250 V
Ground plane 2
Ground plate in another building
Metal cabinet
Terminal or connector
Cable clamp
in steel
Plastic cable gland
Shielded cable
24 Beijer Electronics, MAEN221