PWM Frequency, Audible Motor Noise, and EMI - PENN Controls - VFD68Bxx - VFD68Cxx - Three‐Phase Motor Speed Controller - VFD68 Three‐Phase Variable Frequency Drive

VFD68 Variable Frequency Drives (230 or 460 VAC) Installation Guide

Brand
PENN Controls
Product name
VFD68 Three‐Phase Variable Frequency Drive
Document type
Installation Guide
Part number
24-7664-3108
Document revision
F
Revision date
2019-08-16
Language
English

Using the default setting (P. 72 = 1), EMI (electromagnetic interference) radiation and leakage current from the wiring between the VFD68 Drive and the motor is low; however, there is a high level of audible motor noise. As the setting for P. 72 increases (up to P. 72 = 15, frequency = 15 kHz), audible motor noise decreases while EMI radiation and leakage current increases.

If the audible noise from the VFD is too great with P.72 set to 1, increase the setting to 4 and listen to the audible noise. To minimize the EMI radiation, use the smallest number possible for P. 72.