Danfoss VLT AutomationDrive FC 301 Programming Manual page 504

Programming Guide | VLT® AutomationDrive FC 301/FC 302
Option Name
[0] Off
[1] On
[2] User defined
14-04 Acoustic Noise Reduction
Default value: [0] Off
Setup: All setups
Data type:
Uint8
Option Name
[0]* Off
[1] On
14-05 PWM Generation
Default value:
[0] Standard
Setup: All setups
Data type: Uint8
Use this parameter in VVC+ and U/f mode only. When running with low ratio between switch frequency and output frequency (especially
close to or <10:1), it is possible to improve the resolution of the PWM modulation and optimize the output voltage.
504 | © 2024.09
Description
Select [0] Off for no overmodulation of the output voltage to
avoid torque ripple on the motor shaft. This feature may be
useful for applications such as grinding machines.
Select [1] On to enable the overmodulation function for the
output voltage. This is the right option when it is required that
the output voltage is higher than 95% of the input voltage
(typically when running over-synchronously). The output
voltage is increased according to the degree of overmodulation.
Control in flux control principle provides an output current of
up to 98% of the input current, regardless of parameter 14-03
Overmodulation.
Modulation index refers to the relation between motor voltage
and DC-link voltage. High overmodulation increases the motor
voltage and optimizes the motor torque and efficiency by
reducing the motor current. A high modulation index increases
the risk of torque ripple on the motor shaft. In applications
where the torque ripple occur, it can be beneficial to disable the
overmodulation. It is possible to configure the setup in the range
defined in parameter 40-55 Modulation Index.
Parameter type:
Conversion index:
Change during operation:
Description
No change of the acoustic motor switching noise.
Select to reduce the acoustic noise from the motor.
Parameter type:
Conversion index:
Change during operation:
Parameter Descriptions
Option
–
True
Option
–
True
AU275636650261en-003201 / 130R0334