EMC filters
EMC filters are mainly used to limit the high-frequency conducted interference from 150Khz to 30Mhz generated by inverter drive systems, thus improving the electromagnetic compatibility (EMC) of the whole system. The European EMC standard EN-55011 sets limit values for electromagnetic radiation from industrial, scientific and medical RF equipment, and drive systems fall within the scope of this standard. The standard defines 2 categories of limits:
Category A: Category A equipment is suitable for use in non-domestic premises and where it is not directly connected to a residential low voltage distribution system.
Class B: Class B equipment applies to premises that are domestic or directly connected to a residential low voltage distribution system.
Note: For detailed specification of this standard, please refer to EN 55011.
MM4 series inverter can be configured with Class A and Class B filters to meet the EN 55011 specification requirements of Class A and Class B equipment limitations. MM4 series inverter part of the model frequency converter has a built-in Class A filter, some models can be configured with an external Class A or B filter, detailed information and technical description can be referred to the corresponding description of the selection sample, we will not go into details here.