FC 300 Design Guide
How to Program
" Parameters: Special
Functions
" 14-** Special Functions
Parameter group for configuring special adjustable
frequency drive functions.
" 14-0* Inverter Switching
Parameters for configuring the inverter sw itching.
14-00 Switching Pa ttern
Option:
60 AVM [0]
*
SFAVM [1]
Function:
Select the s witching pattern: 60° AVM or SFAVM.
14-01 Switching Frequen c y
Option:
1.0 kHz [0]
1.5 kHz [1]
2.0 kHz [2]
2.5 kHz [3]
3.0 kHz [4]
3.5 kHz [5]
4.0 kHz [6]
5.0 kHz [7]
6.0 kHz [8]
7.0 kHz [9]
8.0 kHz [10]
10.0 kHz [11]
12.0 kHz [12]
14.0 kHz [13]
16.0 kHz [14]
Function:
Select the inverter switching frequency. Changing
the switching frequency can help to re
duce
acoustic noise from the motor.
NOTE
The output frequency value of the
frequency converter must neve
r exceed
1/10 of the switching frequency. When the
motor is running, adjust the switching frequency in
par. 4-11 until the motor is
as noiseless as possible.
See also par. 14-00 and the section Derating.
NOTE
Switching frequencies higher than 5.0 kHz
lead to automatic derating of the maximum
output o f the fre quency converter.
14-03 Overmodulation
Option:
Off [0]
*
On [1]
Function:
Select On [1] to connect the overmodulation
function for the output voltage, to obtain an output
voltage up to 15% greater than the line voltage.
Select Off [0] for no overmodulation of the output
voltage, in order to avoid torque ripple on the
motor shaft. This feature may be useful for
applications such as grinding machines.
14-04 PWM Random
Option:
*
Off [0]
On [1]
Function:
Select On [1] to transform the acoustic motor
switching noise from a clear ring tone into a less
discernable ‘white’ noise. This is achieved by
slightly and randomly altering the synchronism of
the pulse width modulated output phases.
Select Off [ 0] for no change to the acoustic
motor switching noise.
" 14-1* Line Supply O n/Off
Parameters for configuring line failure
monitoring a nd handling.
14-12 Function at Line Imbalance
Option:
*
Trip [0]
Warning [1]
Disabled [2]
Function:
When a severe line imbalance is dete cted:
Select Trip [0] to trip the adjustable frequency drive;
Select Warning [1] to issue a warning;
or
Select Disabled [2] for no action.
*
default setting ()display text []value for use in communication via serial communication port
236
MG.33.B
6.22 - V LT is a registered Danfoss trademark
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