Operating instructions

Installation Notes OI: BK MIKRO LIN.B
Page 28 of 30 Rev. 2.02 dated 31.05.2007
7.3 Interference prevention
All inputs are opto-decoupled and thus maximally protected against interference voltage peaks,
as caused, for example, by inductive sources.
Relay outputs are protected by varistors against inductive interference voltage peaks. Depending
on the type of load used, further interference suppression measures may be necessary.
To ensure optimum operational safety, suppression measures, if required, must be taken at
source, i.e. directly where interference is caused.
Possible additional noise filters:
• RC combination (included in the contactor suppliers' product ranges)
• Varistors
• Diodes