Parameters: 14-** Special Functions - Danfoss VLT AutomationDrive FC 301 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
NOTICE
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 converter switching frequency. Changing the switching
frequency can reduce acoustic noise from the motor. Default
values depend 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
NOTICE
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 to minimise
motor noise.
®
VLT AutomationDrive FC 301/302 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
MG33MH02 - Rev. 2013-09-30
NOTICE
To avoid a trip, the frequency converter can adapt
the switching frequency automatically.
14-03 Overmodulation
Option: Function:
[0] Off Select [0] Off for no overmodulation of the output
voltage, 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-
synchronously). The output voltage is increased
according to the degree of overmodulation.
NOTICE
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 Overmodulation.
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 tries to continue in a controlled way until the
power in the DC link has been exhausted.
14-10 Mains Failure
Note:
Options [1], [2], [5], [7] are not active when the option [2] Torque
is selected in parameter 1-00 Configuration Mode.
Option: Function:
14-10 Mains Failure is typically used where very
short mains interruptions (voltage dips) are
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