Option
Name
Description
[12]
12.0 kHz
[13]
14.0 kHz
[14]
16.0 kHz
Parameter 14-02 Switching Pattern Shift Frequency
Table 703: Parameter 14-02 Switching Pattern Shift Frequency
14-02 Switching Pattern Shift Frequency
Default value: 15 Hz
Parameter type: Range, 15 - 590 Hz
Setup: All setups
Conversion index: 0
Data type: Uint16
Change during operation: True
Set the frequency where the switching pattern shifts between SFAVM and 60 AVM. Set a value to keep high-speed motors in SFAVM
mode during ramp-up and during low-speed operation. The value to set is motor-dependent. The pattern shift frequency can be set
when
parameter 14-00 Switching Pattern
is set to
[0] 60 AVM
.
Parameter 14-03 Overmodulation
Table 704: Parameter 14-03 Overmodulation
14-03 Overmodulation
Default value: Size related
Parameter type: Option
Setup: All setups
Conversion index: -
Data type: Uint8
Change during operation: False
N O T I C E
Overmodulation leads to increased torque ripple as harmonics increase.
Op-
tion
Name
Description
[0]
Off
Select
[0] Off
for no overmodulation of the output voltage to avoid torque ripple on the motor shaft. This fea-
ture may be useful for applications such as grinding machines.
[1]
On
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-syn-
chronously). The output voltage is increased according to the degree of overmodulation. Control in flux con-
trol principle provides an output current of up to 98% of the input current, regardless of
parameter 14-03
Overmodulation
.
[2]
User
defined
Modulation index refers to the relation between motor voltage and DC-link voltage. High overmodulation in-
creases 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 14-04 Acoustic Noise Reduction
Table 705: Parameter 14-04 Acoustic Noise Reduction
14-04 Acoustic Noise Reduction
Default value: [0] Off
Parameter type: Option
Setup: All setups
Conversion index: -
Data type: Uint8
Change during operation: True
AU275636650261en-000101 / 130R0334
452 | Danfoss A/S © 2022.12
Parameter Descriptions
VLT AutomationDrive FC 301/302
Programming Guide
Summary of Contents for VLT AutomationDrive FC 301
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