Safety and Reliability 2.5.7. Location of installation Make sure that there are no impediments due to temperatures, dirt, impact, vibrations and electromagnetic interference. Temperature Consider heat sources such as general heating of rooms, sun- light, heat accumulation in assembly rooms or control cabinets. Dirt 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 routes, presses, ramming machines and vehicles. Electromagnetic interference Consider electromagnetic interference from various sources near the location of installation:
motors, switching devices, switching thyristors, radio-controlled devices, welding equip- ment, arcing, switched-mode power supplies, converters / in- verters. 2.5.8. Particular sources of interference Inductive actuators Switching off inductances (such as from relais, contactors, so- lenoids or switching magnets) produces overvoltages. It is nec- essary to reduce these extra voltages to a minimum. Reducing elements my be diodes, Z-diodes, varistors or RC el- ements. To provide suitably designed reducing elements, we recommend asking the manufacturer or supplier of the corre- sponding actuators for the relevant information. 2 - 8