KUHNKE Automation Reliability, Safety 3.6.4 Electrical Immission Safeguard To bleed electromagnetic interference, connect the controller to operative earth and ensure best-practice wiring. Susceptibility to noise Electromagnetic Compatibility (EMC) - Part 6-2: Generic standards - Immu- nity for industrial environments (IEC 61000-6-2:2005); 3.6.5 Cable Routing and Wiring Keep power circuits separate from control circuits: • AC voltages 25 V ... 400 V Joint laying of control circuits is allowed for: • DC voltages 60 V ...
400 V • shielded data signals • shielded analogue signals • unshielded digital I/O lines • unshielded DC voltages • unshielded AC voltages 3.6.6 Location of Installation Ensure that temperatures, contaminations, impact, vibration or electromag- netic interference are no impediment to the installation. 3.6.6.1 Temperature Consider heat sources such as general heating of rooms, sunlight, heat ac- cumulation in assembly rooms or control cabinets. 3.6.6.2 Contamination Use suitable casings to avoid possible negative influences due to humidity, corrosive gas, liquid or conducting dust.
3.6.6.3 Impact and Vibration Consider possible influences caused by motors, compressors, transfer lines, presses, ramming machines and vehicles. 3.6.6.4 Electromagnetic Interference Consider electromagnetic interference from various local sources: motors, switching devices, switching thyristors, radio-controlled devices, welding equipment, arcing, switched-mode power supplies, converters / inverters. 3.6.7 Particular Sources of Interference 3.6.7.1 Inductive Actuators Switching off inductances (such as from relays, contactors, solenoids or switching magnets) produces surge voltages. It is necessary to reduce these extra voltages to a minimum.
Throttling elements could be diodes, Z-diodes, varistors or RC elements. Their rating should conform to the specifications provided by the manufac- turer or supplier of the actuators. E 774 GB 13 30.06.2014