Main Menu - Special Functions -Group; Inverter Switching; Switching Pattern; Switching Frequency - Danfoss VLT Programming Manual

3 Parameter Description

3.14 Main Menu - Special Functions -Group 14

3.14.1 14-** Special Functions
Parameter group for configuring special frequency converter functions.
3

3.14.2 14-0* Inverter Switching

Parameters for configuring the inverter switching.

14-00 Switching Pattern

Option:
[0] * 60 AVM
[1] SFAVM

14-01 Switching Frequency

Option:
[0] 1.0 kHz
[1] 1.5 kHz
[2] 2.0 kHz
[3] 2.5 kHz
[4] 3.0 kHz
[5] 3.5 kHz
[6] 4.0 kHz
[7] * 5.0 kHz
[8] 6.0 kHz
[9] 7.0 kHz
[10] 8.0 kHz
[11] 10.0 kHz
[12] 12.0 kHz
[13] 14.0 kHz
[14] 16.0 kHz
14-03 Overmodulation
Option:
[0] Off
[1] * On
146
Function:
Select the switching pattern: 60° AVM or SFAVM.
Function:
Select the inverter switching frequency. Changing the switching frequency can help to reduce
acoustic noise from the motor.
NB!
The output frequency value of the frequency converter must never exceed 1/10
of the switching frequency. When the motor is running, adjust the switching fre-
quency in par. 14-01
possible. See also par. 14-00
Function:
Selects no over-modulation of the output voltage in order to avoid torque ripple on the motor shaft.
The over-modulation function generates an extra voltage of up-to 8% of U
over-modulation, which results in an extra torque of 10-12% in the middle of the over-syncronous
range (from 0% at nominal speed rising to approximately 12% at double nominal speed).
MG.11.C9.02 - VLT ® is a registered Danfoss trademark
®
VLT HVAC Drive Programming Guide
Switching Frequency until the motor is as noiseless as
Switching Pattern
and the section
output voltage without
max
Derating
.