Shield connection for OCT motor cables

The shield connection for the OCT motor cables is included in the scope of delivery and is mounted on the underside of the ELM72xx housing. If lost, the shielding bracket can be reordered separately:

• ZS5300-0015 | Shielding bracket for EtherCAT connection of ELM721x/ELM722x EtherCAT Terminals
  https://www.beckhoff.com/de-de/produkte/i-o/zubehoer/weiteres-zubehoer/montage/zs5300-0015.html
• ZS5300-0016 | Shielding bracket for EtherCAT connection of ELM723x EtherCAT Terminals
  https://www.beckhoff.com/de-de/produkte/i-o/zubehoer/weiteres-zubehoer/montage/zs5300-0016.html

The shield connection is used to ground electrical interference signals arriving via the motor cable shield at the housing with low resistance. The fault signals are then directed to the DIN rail via the metallic ELM housing and the integrated grounding springs. For this to work, the DIN rail/control cabinet also has to have a low-resistance connection, of course.

Note: Electrical faults usually occur in the form of high-frequency signals. Therefore, it is important to not only ensure a good low-resistance connection for DC signals (continuity test with a multimeter), but also to ensure its effectiveness for high-frequency signals in the form of a low-impedance connection. This should be tested with special measuring devices, unless the general installation instructions regarding EMC-compliant control cabinet construction are observed.

The shield connection should be used as follows:

• Attach the shield connection with the screw provided. Clean the contact surfaces, as appropriate. The second screw hole remains free in case a PE connection is required.
• Connect the individual wires of the OCT motor cable to the push-in connector provided. It should be noted that the feedback lines are twisted.
• Plug the push-in connector onto the base strip X002 or X003 and tighten the screws of the screw flange with a screwdriver.
• Press the cable shield onto the shield connector with your thumbs

Note: the shield connection does not act as strain relief!