5
VFD-B Series
DELTA ELECTRONICS, INC. ALL RIGHTS RESERVED
5-13
(1) It is recommended to use “ramp to stop” for the personnel’s safety or to prevent the
materials from being wasted applications that the motor has to stop after the drive is
stopped. As for the deceleration time, it has to be set according to the field tuning.
(2) If the motor free run is okay or the loading inertia is great, it is recommended to set it
as “coast to stop”.
For example: blowers, punching machines, and pumps.
Hz
Freq.
Motor
Speed
Stops according
to deceleration
time
Time
Hz
Freq.
Motor
Speed
Free running
to stop
Time
Operation
command
RUN
RUN
02 - 03
PWM Carrier Frequency Selections Unit: 1
HP Setting range Factory setting
1-5HP 01-15KHz 15
7.5-25HP 01-15KHz 09
30-60HP 01-09KHz 06
75-100HP 01-06KHz 06
This parameter determines the PWM carrier frequency of AC drive.
Carrier Frequency Acoustic Noise
Electromagnetic Noise,
Leakage Current
Heat Dissipation
1kHz
15KHz
Significant
Minimal
Minimal
Significant
Minimal
Significant
From the table, we see that the PWM carrier frequency has a significant influence on the
electromagnetic noise, heat dissipation of the AC drive, and the acoustic noise to the
motor.
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