Pwm Carrier Frequency - Toshiba TOSVERT VF-PS1 Instruction Manual

 Gradient bias adjustment of analog monitor output
Here is an example of the adjustment of output from 0-20mA  20-0mA, 4-20mA using the FM terminal. 
The analog output inclination can be adjusted using the parameter  .
5
5.17

PWM carrier frequency

  : PWM carrier frequency
  : Random mode
  : Carrier frequency control mode selection
• Function
1) The sound tone of acoustic noise can be changed by adjusting the PWM carrier frequency. This parameter is
also effective in preventing the motor from resonating with its load machine or its fan cover.
2) In addition, this parameter reduces the electromagnetic noise generated by the inverter. Reduce the carrier
frequency to reduce electromagnetic noise. Note: Although the electromagnetic noise level is reduced, the
magnetic noise of the motor is increased.
3) The random mode reduces motor magnetic noise by changing the pattern of the reduced carrier frequency.

4) To set the parameter  to  or  has the effect of suppressing voltage serge to the motor. Reduce the
carrier frequency to less than 4kHz if the wiring between the inverter and motor is long (20 to 100m as a
guide).
5) In case of using the sinusoidal filter, set the parameter  to  or  .
This parameter works at 200V-55kW and above models, and 400V-90kW and above models.
[Parameter setting]
Title



Note 1: For 200V-55kW to 200V-90kW models and 400V-90kW to 400V-630kW models, the carrier frequency is
between 2.5 and 8.0kHz inclusive.
Note 2: If  is set at 2.0kHz or above, it cannot be decreased below 2.0kHz during operation. Changes made to
decrease  below 2.0kHz take effect when operation is restarted after it is stopped.
 =  ,  = 
(mA)
20
0
0 100%
 =  ,  = 
(mA)
20
large
0
0 100%
Function
PWM carrier frequency  ~  kHz (  ~  kHz) [Note 1]
Random mode  : Disabled,  : Enabled
 : Not decrease carrier frequency automatically
 : Decrease carrier frequency automatically
 : Not decrease carrier frequency automatically,
400V class supported
Carrier frequency  : Decrease carrier frequency automatically,
control mode selection 400V class supported
 : Not decrease carrier frequency automatically,
with sinusoidal filter
 : Decrease carrier frequency automatically,
with sinusoidal filter
 =  ,  = 
(mA)
20
4
0
0
 =  ,  = 
(mA)
20
4
0
0
Adjustment range
[Note 11]
[Note 11]
E-30
E6581386
100%
small
100%
Default setting
According to model
 Refer to page K-42.

