Pwm Carrier Frequency - Toshiba TOSVERT VF-AS1 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

• 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.
[Parameter setting]
Title
Note 1: If the PWM carrier frequency is set at 2.0kHz or above, it cannot be decreased below 2.0kHz during
operation. Changes made to decrease the carrier frequency below 2.0kHz take effect when operation is
restarted after it is stopped.
Note 2: If the parameter setting is 1.9kHz or less, you cannot change the setting at 2.0kHz or more. Changes made
to increase the carrier frequency to 2.0kHz or above take effect immediately.
Note 3: If
carrier frequencies.
Note 4: If you change the carrier frequency, you may need to reduce the inverter's continuous output current.
• Ë
Note 5: If the motor becomes overloaded when
automatically), an overload trip occurs.
Note 6: For the setting
Note 7: When setting the carrier frequency (
below 130%.
= , =
(mA)
20
0
0
= , =
(mA)
20
large
0
0
: PWM carrier frequency
: Random mode
: Carrier frequency control mode selection
Function
PWM carrier frequency
Random mode
Carrier frequency control
mode selection
(V/f control mode selection) is set to
Refer to Section 1.4.4, "Current reduction curve."
= or to take effect, power needs to be turned off and then turned back on.
= ,
(mA)
100%
= ,
(mA)
100%
.
Adjustment range
~ ( )kHz [Upper limits differ by
applicable motor capacity.]
:Disabled, : Enabled
:Not decrease carrier frequency automatically
:Decrease carrier frequency automatically
:Not decrease carrier frequency automatically,
400V class supported
:Decrease carrier frequency automatically,
400V class supported
, , , , or , the inverter sets a lower limit of 2.0kHz for
is set to or
) between and . kHz, you are recommended to set
E-30
=
20
4
0
0 100%
=
20
small
4
0
0 100%
Default setting
According to model
(carrier frequency not decreased
E6581301