Shield connection

The shield connection is an optional component, which can be installed on the underside of the ELMxxxx housing. It must be ordered separately.

Available models:

• ZS9100-0002: Shield connection for ELM series
• screw clamping, packaging unit = 1 piece



• ZS5300-0015: Shielding bracket for EtherCAT connection of EtherCAT Terminal ELM721x/ELM722x
• clamping, 2 cables, packaging unit = 5 pieces
• ZS5300-0016: Shielding bracket for EtherCAT connection of EtherCAT Terminal ELM723x
• clamping, 1 cable, packaging unit = 5 pieces

It is used as a low-resistance earthing connection at the housing, to deal with electrical interference signals arriving via the cable screen. 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 must 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:

• Lever off the plastic cover from the ELM housing and retain if for later reuse, if required
• 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.
• Strip the signal cable, feed it through the shield clamp and hand-tighten the clamp (recommended screw tightening torque: 0.5 Nm)
• Apply the signal cable wires at the plug connector.
• For disassembly, proceed in reverse order.

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

Alternative shield connection methods for analog signal lines:

• Beckhoff shielding connection system ZB8500 https://www.beckhoff.com/zb8500/
  
• Separate shield connection depending on requirements