Pwm Carrier Frequency Selections - Delta VFD-L series User Manual

The parameter determines how the motor is stopped when the AC drive receives a
valid stop command.
1. Ramp: the AC drive decelerates the motor to Minimum Output Frequency (Pr.1-05) and
then stops according to the deceleration time set in Pr.1-10 or Pr.1-12.
2. Coast: the AC drive stops output instantly upon command, and the motor free runs until
it comes to a complete stop.
H z
F re q .
M o to r
S p e e d
O p e ra tio n
c o m m a n d
Note: The motor stop method is usually determined by the characteristics of the motor load
and frequency of stops.
2 - 03

PWM Carrier Frequency Selections

Settings
This parameter can set the carrier frequency of PWM output.
Carrier
Frequency
3KHz
10KHz
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S to p s a c c o rd in g
to d e c e le ra tio n
tim e
O N
O F F
R a m p
d 03 fc= 3KHz
d 04 fc= 4KHz
d 05 fc= 5KHz
to
d 10 fc= 10KHz
Acoustic Noise
Significant
Minimal
H z
F re q .
M o to r
S p e e d
T im e
Electromagnetic
Noise, Leakage
Current
Minimal
Significant
5-11
VFD-L Series
F re e ru n n in g
to s to p
O N
O F F
C o a s t
Factory Setting: d 10
Unit: 1KHz
Heat
Dissipation
Minimal
Significant
5
T im e