Pwm Carrier Frequency - Toshiba 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


 : 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).
[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.
Note 3: If  is 1.9kHz or less, you cannot change the setting at 2.0kHz or more. Changes made to increase  to
2.0kHz or above take effect immediately.
Note 4: If  (V/f control mode selection) is set to  ,  or  , the inverter sets a lower limit of 2.0kHz for  .
 =  ,  = 
(mA)
20
0
0
 =  ,  = 
(mA)
20
large
0
0
: PWM carrier frequency
Function
PWM carrier frequency  ~  kHz (  ~  kHz) [Note 1]
Random mode  :Disabled,  : Enabled
 :Not decrease carrier frequency automatically
 :Decrease carrier frequency automatically
Carrier frequency  :Not decrease carrier frequency automatically,
control mode selection
 :Decrease carrier frequency automatically,
 =  ,  = 
(mA)
100%
 =  ,  = 
(mA)
100%
Adjustment range
400V class supported
400V class supported
E-30
20
4
0
0 100%
20
small
4
0
0 100%
Default setting
According to model
⇒ Refer to page K-41.


E6581386