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8400 BaseLine D | Software Manual
Motor control (MCTRL)
Selection of the switching frequency
94
L
Firmware 03.00 - DMS EN 5.0 - 07/2009
5.3
Selection of the switching frequency
The switching frequency of the inverter has an effect on the smooth running performance
and the noise generation in the motor connected, as well as on the power loss in the
controller.
The lower the switching frequency, the
better the concentricity factor
lower the power loss
higher the noise generation.
Adjustable switching frequencies:
Lowering the switching frequency due to high heatsink temperatures
If the maximally permissible heatsink temperature was exceeded, the drive would be
inhibited due to the "Overtemperature" error and the motor would coast without any
torque.
Therefore, the switching frequency in the Lenze setting is lowered to the next smaller value
when the heatsink temperature has increased to 5 ° C below the maximum permissible
temperature.
After the heatsink has cooled down, the controller automatically switches to the next
higher switching frequency up to the switching frequency set.
Lowering the switching frequency can be prevented using code
. When the maximum
permissible heatsink temperature is reached, "Fault" is set for the respective switching
frequency and the motor coasts, see code
.
Note!
Operate the mid-frequency motors exclusively with the switching frequency
f = 8 kHz
sin
or f = 16 kHz
sin
.
Parameter
Values
1: 4 kHz var./drive-optimised
2: 8 kHz var./drive-optimised
3: 16 kHz var./drive-
optimised
4: Reserved
5: 2 kHz constant/drive-
optimised
6: 4 kHz constant/drive-
optimised
7: 8 kHz constant/drive-
optimised
8: 16 kHz constant/drive-
optimised