Servo Motor / VFD Combo Filter SF20032

This patented model of servo motor/VFD EMI filter uniquely combines both motor and AC filtering in one small enclosure providing complete EMI filtering for a servo motor or VFD.   If you want only motor filter please consider SF20031 (3A), SF20101 (10A), or SF20201 (20A) models.


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Optional DIN-rail mount

"We tested the servo filter on another system, this time with Kollmorgen motors. We saw another significant reduction in noise on our signal"  (P.M.,U.K.)

All specifications are subject to change without notice

If you are not sure which specific model would work with your drive/motor, send us a legible photo of drive and/or motor label and if you know, the specific models 

  • No mechanical attachments

  • No changes in software

  • No adjustments

Basic Connections and Performance of  Servo/VFD Motor Filter SF20032

Connections of AC Mains Filter Section

AC Voltage Reduction with SF20032 Filter

Connections of Motor Filter Section

Servo / VFD Filter Connections

Ground Current Reduction with SF Series Motor Filters

Pulse Edge Modification

AC Voltage Reduction with SF20032

Mounting Dimensions

SF20031, SF20032 and SF20101
Click on drawing to enlarge

DIN Rail Mount Option

DIN Rail Mount for OnFILTER Servo/VFD Filters
This filter is available with DIN rail mount. To the left is shown back of SF20031, SF20032 and SF20101 filters with DIN rail mount.

For DIN rail mount add "-N" to the model number: SF20032-N 
Application Notes
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Technical Articles

Interference Technology Magazine' Annual EMC Test and Design Guide, 2016

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What is EMI?  A formal definition of Electromagnetic Interference is that it is a malfunction of equipment caused by excessive high-frequency signals, either radiated (via air), or conducted (via wires).  Often it is also called RFI - Radio Frequency Interference.  Most conventionally, EMI is understood as undesirable high-frequency signals, and EMI filters as devices that suppress such signals while preserving the "good" ones.         

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U.S. Patents 10,263,591; 9,076,806 All specifications are subject to change without notice.

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Our products are made in U.S.A.