Main Menu - Special Functions -Group - Danfoss VLT FC 100 Series Programming Manual

Parameter Description

3.14 Main Menu - Special Functions -Group 14

3.14.1 14-0* Inverter Switching
3 3
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
3-90
VLT
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.
NOTE!
The output frequency value of the
adjustable frequency drive must never
exceed 1/10 of the switching frequency.
When the motor is running, adjust the
switching frequency in 14-01 Switching
Frequency until the motor is as noiseless as
possible. See also 14-00 Switching Pattern
and the section Derating.
MG11CD22 - VLT
®
HVAC Drive Programming Guide
NOTE!
Enabling overmodulation can cause vibrations that may
destroy the mechanics if running in field weakening areas
(from 47Hz).
14-03 Overmodulation
Option:
[0] Off Selects no overmodulation of the output voltage in
*
order to avoid torque ripple on the motor shaft.
[1] On The overmodulation function generates an extra
voltage of up to 8% of U
overmodulation, which results in an extra torque of
10–12% in the middle of the oversyncronous range
(from 0% at nominal speed rising to approximately
12% at double nominal speed).
14-04 PWM Random
Option:
[0] Off No change of the acoustic motor switching noise.
*
[1] On Transforms the acoustic motor switching noise from a
clear ringing tone to a less noticeable 'white' noise.
This is achieved by slightly and randomly altering the
synchronism of the pulse width modulated output
phases.
3.14.2 14-1* >Mains Power On/Off
Parameters for configuring line failure monitoring and
handling.
® is a registered Danfoss trademark
Function:
output voltage without
max
Function: