VFD68 Variable Frequency Drive (575 VAC) Installation Instructions
24
The drive can be configured to display operating frequency (Hz) or motor speed (RPM). To display motor speed
(RPM) instead of operating frequency (Hz), set P. 37 to the rated motor RPM value. See
Parameter Settings Calculations for Motor Speed vs. Pressure
Note:
To use a 0
–
10V or 4
–
20mA P499 Transducer, refer to the
VFD68 Variable Frequency Drive Technical
Bulletin (Part No. 24-7664-3051)
.
PWM Frequency, Audible Motor Noise, and EMI
Using the default setting (P. 72 = 1, frequency = 1 kHz), electromagnetic interference (EMI) 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.
Figure 16: Calculating Parameters for Applications Using One or Two
0.5–4.5 V Ratiometric Transducers
