Parameters: 14-** Special Functions - Danfoss VLT AutomationDrive FC 300 Series 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] 12.0 kHz
[13] 14.0 kHz
[14] 16.0 kHz
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 Programmming 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
®
MG33ME02 - 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-
synchronously). The output voltage is increased
according to the degree of overmodulation.
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 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
interruption, the DC voltage on the main
capacitors drops quickly. For larger drives it only
takes a few milliseconds before the DC level is
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