EMC Installations

• Use filter modules for 24 V power supply lines longer than 30 m.
  To comply with EN 61000-6-2:2019, filter modules (750-626/xxx-xxx or 750-624/xxx-xxx) must be used for both system and field power supply lines that are longer than 30 m.
• Ground DIN-rails.
  Ground the DIN-rails to divert electromagnetic interference.
• Use shielded cables for data and signal lines.
  Electromagnetic interference is reduced and signal quality increased. Measurement errors, data transmission faults and interference due to excessive voltage can be prevented!
• Keep data and signal lines separate from interference sources.
  Route data and signal lines separately from all power supply cables and other sources of high electromagnetic emissions (e.g., frequency converters or drives).
• Connect the cable shielding with the ground potential.
  Integrated shielding is mandatory to meet technical specifications regarding measurement accuracy. Establish the connection between the cable shielding and ground potential at the inlet of the cabinet or housing. This grounding allows induced interferences to dissipate and be kept away from devices in the cabinet or housing.
• Improve shielding performance with a large contact area.
  A low-impedance connection between shielding and ground achieves better shielding performance. For this purpose, connect the shielding over a large surface area, e.g., using the WAGO Series 790 Shield Connection System. This is especially recommended for large-scale systems where equalizing or high impulse currents may occur.