KUHNKE Automation
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2.6.4 Electrical Immission Safeguard
To bleed electromagnetic interference, connect the controller to opera-
tive earth and ensure best-practice wiring.
Susceptibility to noise
Electromagnetic Compatibility (EMC) - Part 6-2: Generic standards -
Immunity for industrial environments (IEC 61000-6-2:2005);
2.6.5 Cable Routing and Wiring
Keep power circuits separate from control circuits:
•
DC voltages
60 V ... 400 V
•
AC voltages
25 V ... 400 V
Joint laying of control circuits is allowed for:
•
shielded data signals
•
shielded analogue signals
•
unshielded digital I/O lines
•
unshielded DC voltages < 60 V
•
unshielded AC voltages < 25 V
2.6.6 Location of Installation
Ensure that temperatures, contaminations, impact, vibration or elec-
tromagnetic interference are no impediment to the installation.
2.6.6.1 Temperature
Consider heat sources such as general heating of rooms, sunlight,
heat accumulation in assembly rooms or control cabinets.
2.6.6.2 Contamination
Use suitable casings to avoid possible negative influences due to hu-
midity, corrosive gas, liquid or conducting dust.
2.6.6.3 Impact and Vibration
Consider possible influences caused by motors, compressors, transfer
lines, presses, ramming machines and vehicles.
2.6.6.4 Electromagnetic Interference
Consider electromagnetic interference from various local sources: mo-
tors, switching devices, switching thyristors, radio-controlled devices,
welding equipment, arcing, switched-mode power supplies, converters
/ inverters.
2.6.7 Particular Sources of Interference
2.6.7.1 Inductive Actuators
Switching off inductances (such as from relays, contactors, solenoids
or switching magnets) produces surge voltages. It is mandatory to
throttle these noise voltages to an admissible amount.
Throttling elements could be diodes, Z-diodes, varistors or RC ele-
