Modern VFDs (Variable Frequency Drives) using IGBT switches for motor frequency control are prone to much higher EMI being generated because of high frequency transistor switching. High dV/dt rates at the motor connected to the VFD result in radiated electric fields and voltage spikes conducted along the motor cabling.
These emissions can be conducted to other electrical equipment connected to the utility. EMIS offers solutions for VFD problems ranging from corrupted data transmission to electric motor drive damage.
Filters are applicable for Category C1, C2 and C3. The Category C1, C2 and C3 are based on the PDS installation and the applicable environment.
This category is for PDSs with rated voltage less than 1000V, intended for use in the First Environment, permitted to be installed by anyone.
This category is for PDSs with rated voltage less than 1000V, which is neither a plug-in device nor a movable device and, when used in the First Environment, is intended to be installed and commissioned only by a “professional”. A professional is defined as a person or an organization having necessary skills in installing and/or commissioning PDSs, including their EMC aspects.
Limit line for C1 and C2 are very Low which requires the Filters with very high Attenuation.
Example: MF423-3-3D-BS or MF423-3-3DD-BS or MF423-3-3D
This applies to PDSs of rated voltage less than 1,000 V, intended for use in the Second Environment and not intended for use in the First Environment, permitted to be installed by anyone.
The C3 limit line is bit relaxed and requires the Filters with Basic attenuation comparing to C1 and C2.
Example: MF423-3-2D-BS or MF423-3-2DD-BS or MF423-3-2D
Featured Solutions for Motor Drives
Other Solutions for EMI Noise Suppression in Motor Drives
and Coupling solutions