PP845A 3BSE042235R2 operation panel

PP845A 3BSE042235R2 operation panel

PP845A 3BSE042235R2 operation panel

1. The operator panel’s mounting clamps do not provide a secure grounding connection between the panel and the device cabinet.
2. 2. Connect a 2.5 mm2 wire between the operator panel’s quick-connect plinth and the panel chassis.
3. 3. Connect a 6 or 4 mm2 wire or grounding braid between the panel’s chassis and the closest grounding point on the door.
4. 4. Connect a strong but short grounding braid between the door and the device cabinet.
5. 5. Twist the cables onto the 24 V DC feed.
6. 6. A ferrite core suppresses disturbances to the 24 V feed. 2 turns around the ferrite core provide 4 times the suppression of 1 turn. 3 turns around the ferrite core provide 9 times the suppression of 1 turn
7. In some industrial units for Ethernet, the RJ45 contact’s shield is connected to the chassis via a capacitor.
8. 2. The operator panel’s Ethernet shield is directly connected to the chassis. Check whether the other Ethernet unit has its shield directly grounded or grounded via a capacitor. 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.
9. 3. One option is to break the shield.
10. 4. A more elegant method is to expand the shielded Ethernet cabling with a piece of unshielded Ethernet cable.
11. 5. You can ground the shield via an external 0.1 uF/250 V plastic capacitor. This will connect the HF transients to the ground