Delta PG-40 Specifications download pdf (Page 48)

VFD-B Series

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.

Freq.

Motor

Speed

Stops according

to deceleration

time

Time

Freq.

Motor

Speed

Free running

to stop

Time

Operation

command

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

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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Delta PG-40 Specifications Page 48

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