6
Installation
and Operation
EDBC250SIO | 2.0
162
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.
Reducing elements may be diodes, Z-diodes, varistors or RC elements. Their rating should con-
form to the specifications provided by the manufacturer or supplier of the actuators.
6.2
Mechanical Installation
Environment of installation
Protect Lenze Safety I/O-module against inadmissible contamination. Do not allow the units to
contaminate more than specified for degree II in IEC 60664-3.
Whereas an enclosure providing IP 54 protection (e.g. an appropriate control cabinet) ensures
that degree of contamination II is complied with, please consider that operation under con-
densing humidity is NOT allowed.
WARNING
Potentially hazardous failures due to contamination
Contaminations more severe, than those described for degree of contamination
II of IEC 60664-3, may cause potentially hazardous failures.
Do ensure that the operating environment complies with at least IP 54, e.g. by
installing the unit in a suitable control cabinet