Kendrion Kuhnke Automation GmbH
Preface
12
11/25/2016
Contamination
Use suitable casings to avoid possible negative influences due to humidity, corrosive gas, liquid or
conducting dust.
Impact and Vibration
Consider possible influences caused by motors, compressors, transfer lines, presses, ramming
machines and vehicles.
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.
Particular Sources of Interference
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 manufacturer or supplier of the actuators.