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EMI/ RFI Filters for VFDs and Servo Drives
What is the best approach when needing an EMI/ RFI filter in conjunction with single or multiple variable frequency drives (VFD) and servo drives?

Following the VFD and servo drive specs is not always sufficient to guarantee a system complies with the CE Certification and IEC Standards. This is because less strict Standards are set for individual components than systems as a whole. Often times, if a system is not meeting the correct Standard, installing an Enerdoor EMI/ RFI filter will not only solve the issue, it often exceeds expectations.

The Challenge
It can be challenging for the OEM, system integrator and distributors to find the proper filter to use inside a cabinet that has multiple VFDs or servo drives. Drive manufacturers often recommend installing a single EMI/ RFI filter for each individual drive. This results in increased cost, more space being used inside the cabinet, and a higher leakage current. Typically, drive manufacturers do not stock EMI/ RFI filters, due to the fact they view the filters as an accessory and feel they are not responsible for supplying all necessary components in the final system. This tends to make it more difficult to purchase these devices.

The Solution
Enerdoor’s goal is to propose one filter per machine instead of one filter per drive.  Using a single filter offers the following advantages: 

Technical:  Low leakage current; protects the entire machine instead of only the drive.
Economical:  Using only one filter requires less mechanical space, reduces potential quality issues due to faulty wiring and accelerates installation time. Decreases cost associated with purchasing multiple filters.
The Result
Enerdoor has been manufacturing EMI/ RFI filters since 1992. The unique combination of being a filter manufacturer and decades of experience with the Enerdoor EMC mobile laboratory has allowed us to comprise a list of filters compatible with the major variable frequency drive and servo drive manufacturers of the world.

All filters listed below have been tested in systems utilizing single or multiple VFDs.

If a drive manufacturer is not listed below, please contact Enerdoor for the appropriate solution.
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Drive Manufacturer
Schneider Electric
Allen Bradley / Rockwell

Enerdoor Filter Recommended
FIN1500 + FIN230SP
FIN1700 or FIN1700E

Enerdoor - The EMC Solution
EMI/ RFI Filters
Motor Protection
CE Certification
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To protect and optimize equipment, Enerdoor EMI/ RFI filters provide solutions in three product categories: single-phase, three-phase, and three-phase plus neutral filters.
Enerdoor developed the Motor Protection series to protect motors from harmful overvoltage and dV/dt spikes generated on the output. This is useful for applications with VFDs and servo motors.
Enerdoor specializes in the measurement and analyses of EMC testing and CE Certification. Our flat rate testing service is unique in the industry, as is our pledge to not leave the facility until equipment is compliant.

For additional information please contact Enerdoor or your local Sales Representative.

Enerdoor  |  77 Industrial Way, Portland, ME, 04103 | 207.210.6511