Lenze 8400 motec - Manual (Page 145)

Lenze · 8400 motec · Reference manual · DMS 4.1 EN · 08/2013 · TD05 145
5 Motor control (MCTRL)
5.10 Parameterisable additional functions
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5.10 Parameterisable additional functions
5.10.1 Selection of switching frequency
The switching frequency of the inverter that can be selected in C00018 influences the smooth
running performance and the noise generation in the connected motor as well as the power losses
in the controller.
The lower the switching frequency the higher the concentricity factor, the smaller the losses, and
the higher the noise generation.
Short overview of the relevant parameters:

Stop!
If operated at a switching frequency of 16 kHz, the output current of the controller must
not exceed the current limit values specified in the technical data! (See chapter "Rated
data" of the hardware manual.)

Note!
• Operate mid-frequency motors only at a switching frequency of 8 kHz or 16 kHz (var./
drive-opt.).
• If operated at a switching frequency of 16 kHz, the Ixt evaluation ( C00064 ) is
considered including the required derating to 67 % of the rated device current at
switching frequencies of 4 and 8 kHz.
• With a switching frequency of 4 kHz at a 400-V mains, the Ixt evaluation ( C00064 ) is
considered with 120 % of the rated device current.
Parameter Info Lenze setting
Value Unit
C00018 Switching frequency 2: "8 kHz var./drive-opt."
C00144 Switching frequency reduction (temp.) 1: On
C00725 Current switching frequency -
C00910/1 Max. pos. output frequency 300 Hz
C00910/2 Max. neg. output frequency 300 Hz
Highlighted in grey = display parameter