VFD68 Variable Frequency Drives (230 or 460 VAC)
33
PWM Frequency, Audible Motor Noise, and EMI
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.
Adjusting the Default Parameters
Enter the Parameter Adjustment Mode
1.
Remove the jumper that connects terminal SD to terminal STF.
2.
Turn the power on. The monitor display appears. (The VFD68 drive is in EXT Mode.)
3.
Press
to exit EXT mode and go to PU mode (manual override operation mode). The PU LED
illuminates.
4.
Press
to select PRM mode (parameter setting mode). The PRM LED illuminates.
Note:
See Table 19 on page 27 for information on the parameters.
Select and Change Most Parameters
5.
Turn
to select a parameter number on the display. Example:
P. 32
6.
Press
to show the parameter value. (The default value for
P. 32
is
12.5
.)
7.
Turn
to change the parameter value. (Set
P. 32
to
9999
if the motor is to run at minimum speed during
low pressure events).
8.
Press
twice to store the new value.
9.
Press
again to show the next parameter.
To select and change the value of another parameter, repeat Step 5 through Step 9.
To adjust the C-Prefix parameters, go to Step 10. If finished, go to Step 16.
!
CAUTION: Risk of Property Damage.
Do not apply power to the system before checking all wiring connections. Short circuited or
improperly connected wires may result in permanent damage to the equipment.
MISE EN GARDE: Risque de dégâts matériels.
Ne pas mettre le système sous tension avant d'avoir vérifié tous les raccords de câblage. Des fils
formant un court-circuit ou connectés de façon incorrecte risquent d'endommager irrémédiablement
l'équipement.
IMPORTANT:
Remove the jumper to stop the motor before you change the
parameter values.
PU
EXT
MODE
SET
SET
SET
