Parameter Settings Calculations For Motor Speed Vs. Pressure; Pwm Frequency, Audible Motor Noise, And Emi - Johnson Controls Penn VFD68 Installation Instructions Manual

Variable frequency drive 575 vac

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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 Adjusting the

Default Parameters on page 26.

Parameter Settings Calculations for Motor Speed vs. Pressure

Figure 16: Calculating Parameters for Applications Using One or Two

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).

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.

0.5–4.5 V Ratiometric Transducers

VFD68 Variable Frequency Drives (575 VAC)

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