Parameters: 14-** Special Functions - Danfoss VLT AutomationDrive FC 302 Programming Manual

Parameter Descriptions

3.15 Parameters: 14-** Special Functions

3.15.1 14-0* Inverter Switching
14-00 Switching Pattern
3 3
Option:
[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 reduces 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
144
VLT
Function:
Select the switching pattern: 60° AVM or SFAVM.
Function:
Default switching frequency for
355-1200 kW [500-1600 hp], 690
V.
Default switching frequency for
250-800 kW [350-1075 hp], 400 V
and 37-315 kW [50-450 hp], 690
V.
Default switching frequency for
18.5-37 kW [25-50 hp], 200 V and
37-200 kW [50-300 hp], 400 V.
Default switching frequency for
5.5–15 kW [7.5-20 hp], 200 V and
11-30 kW [15-40], 400 V.
Default switching frequency for
0.25–3.7 kW [0.34-5 hp], 200 V
and 0.37-7.5 kW [0.5-10 hp], 400
V.
Danfoss A/S © Rev. 10/2014 All rights reserved.
®
AutomationDrive FC 301/302
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 parameter 14-01 Switching Frequency to
minimise motor noise.
NOTICE
To avoid a trip, the frequency converter is able to 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 (typically 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
parameter 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:
[0] Off
[1] On
*
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.
Function:
No compensation.
Activates dead time compensation.
MG33MJ02