14-01 Switching Frequency
Option: 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 par.14-01
Switching Frequency
until the motor is as noiseless as
possible. See also par. 14-00
Switching Pattern
and the section
Derating
.
[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: Function:
[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
max
output voltage without
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).
20-00 Feedback 1 Source
Option: Function:
Up to three different feedback signals can be used to provide the feedback signal for the adjustable
frequency drive’s PID controller.
This parameter defines which input will be used as the source of the first feedback signal.
Analog input X30/11 and Analog input X30/12 refer to inputs on the optional general purpose I/O
board.
[0] No function
[1] Analog input 53
[2] * Analog input 54
[3] Pulse input 29
[4] Pulse input 33
[7] Analog input X30/11
VLT
®
HVAC Drive Instruction Manual
6 How to program the adjustable frequency
drive
MG.11.A9.22 - VLT
®
is a registered Danfoss trademark
6-43
6
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