2.15. Parameters: Special Functions
2.15.1. 14-** Special Functions
Parameter group for configuring special frequency converter functions.
2.15.2. Inverter Switching, 14-0*
Parameters for configuring the inverter switching.
14-00 Switching Pattern
Option:
Function:
[0]
60 AVM
[1]
*
SFAVM
Select the switching pattern: 60° AVM or SFAVM.
14-01 Switching Frequency
Option:
Function:
[1]
1.5 kHz
14-03 Overmodulation
Option:
Function:
[0]
Off
[1]
*
On
Select
On
[1] to connect the overmodulation function for the output voltage, to obtain an output voltage up to
15% greater than the mains 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:
Function:
[0]
*
Off
[1]
On
Select
On
[1] to transform 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.
Select
Off
[0] for no change of the acoustic motor switching noise.
2.15.3. 14-1* Mains On/Off
Parameters for configuring mains failure monitoring and handling. If a mains failure appears, the frequency converter will try to continue in a controlled
way until the power in the DC link has been exhausted.
14-10 Mains Failure
Option:
Function:
[0]
*
No function
[1]
Controlled ramp-down
[2]
Controlled ramp-down,
trip
[3]
Coasting
[4]
Kinetic back-up
[5]
Kinetic back-up, trip
[6]
Alarm
Function: Select the function to which the frequency converter must act when the threshold in par 14-11 has
been reached.
2. How to Programme
FC 300 Programming Guide
142
MG.33.M3.02 - VLT
®
is a registered Danfoss trademark
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