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Procedure

4.2 Standards Governing Electromagnetic Compatibility (EMC) of VFDs

• Keep signal cables away from motors and transformers, as they can generate large

magnetic fields.

Magnetic fields can induce currents into nearby cables.

• Follow all grounding recommendations from the VFD and instrumentation supplier.

Grounding is important for both safety and noise suppression.

• Follow all guidelines for installing wireless communication products and antennas.

Incorrect grounding or orientation of antennas can severely reduce their effectiveness and

noise immunity.

• Use quality instrumentation that has the CE or FCC mark.

Equipment with this designation has been designed, tested and certified to withstand

normal levels of electromagnetic interference.

4.2

Standards Governing Electromagnetic Compatibility (EMC) of

VFDs

The specifics of electromagnetic compatibility and standards are beyond the scope of this

document, but an overview is provided. Contact the drive manufacturer for specific details

and regional requirements.

In Europe, VFDs are covered under EMC product standard EN or IEC 61800-3 for Power Drive

Systems. This standard covers the complete system including drive, interface, motor, and

cables.

In the United States, VFD systems are covered in a general manner by FCC CFR Title 47, Part

15, but there are no specific product requirements or test procedures.

The manufacturer of the drive is not responsible for guaranteeing the EMC performance of

the fully installed drive and motor, but they will provide information on the EMC

characteristics, use, and installation of the device as part of a drive system.

Generally, the manufacturer can also supply optional filters and other equipment that will

improve EMC performance.

Using Variable Frequency Drives and Instrumentation Without Interference

Application examples, 09/2020, AG080819