Parameters: 14-** Special Functions - Danfoss VLT AutomationDrive FC 300 Programming Manual

Parameter Descriptions

3.15 Parameters: 14-** Special Functions

3.15.1 14-0* Inverter Switching
14-00 Switching Pattern
Option: Function:
Select the switching pattern: 60° AVM or SFAVM.
[0] 60 AVM
[1] SFAVM
NOTE
The switching pattern may be automatically adapted by
the frequency converter in order to avoid a trip. See
application note on derating for more details.
14-01 Switching Frequency
Select the inverter switching frequency. Changing the switching
frequency can help to reduce acoustic noise from the motor.
Default depends on power size.
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] 12.0kHz
[13] 14.0 kHz
[14] 16.0kHz
NOTE
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 frequency in
14-01 Switching Frequency until the motor is as noiseless as
possible.
®
VLT AutomationDrive Programming Guide
Function:
Default switching frequency
for 355-1200 kW, 690 V
Default switching frequency
for 250-800 kW, 400 V and
37-315 kW, 690 V
Default switching frequency
for 18.5-37 kW, 200 V and
37-200 kW, 400 V
Default switching frequency
for 5.5–15 kW, 200 V and
11-30 kW, 400 V
Default switching frequency
for 0.25–3,7 kW, 200 V and
0.37-7.5 kW, 400 V
®
MG33MG02 - VLT is a registered Danfoss trademark
NOTE
The switching frequency may be automatically adapted by
the frequency converter in order to avoid a trip. See
application note on derating for more details.
14-03 Overmodulation
Option: Function:
[0] Off Select [0] Off 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.
[1] On Select [1] On to enable the overmodulation function for
the output voltage. This is the right choice when it is
required that the output voltage is higher than 95% of
the input voltage (typical when running over-synchro-
nously). The output voltage is increased according to
the degree of overmodulation.
NOTE
Overmodulation leads to increased torque ripple
as harmonics are increased.
Control in FLUX mode provides an output current of up
to 98% of the input current, regardless of 14-03 Overmo-
dulation.
14-04 PWM Random
Option: Function:
[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.
14-06 Dead Time Compensation
Option: Function:
[0] Off No compensation.
[1] On Activates dead time compensation.
3.15.2 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:
14-10 Mains Failure is typically used where very
short mains interruptions (voltage dips) are
present. At 100% load and a short voltage
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