Lenze 8400 BaseLine D - Manual (Page 93)

Lenze · 8400 BaseLine D · Reference manual · DMS 5.5 EN · 01/2014 · TD05
93
5 Motor control (MCTRL)
5.6 Parameterisable additional functions
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
5.6 Parameterisable additional functions
5.6.1 Selection of switching frequency
The switching frequency of the inverter that can be selected in C018 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.
Settable switching frequencies

Tip!
The Lenze setting
C018 = 2 (8 kHz var./drive-opt.) is the optimal value for standard applica-
tions.

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!
 Defining current and speed limits ( 77)

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 ( C064 ) is considered
including the required derating to 67 % of the rated device current at switching fre-
quencies of 2.4 and 8 kHz.
Selection in C018 Info
1 4 kHz var./drive-optimised • "var.": Adaptation of the switching frequency depending on the
current
• "drive-opt.": drive-optimised modulation ("sine/delta modulati-
on")
• "fixed": fixed switching frequencies
2 8 kHz var./drive-optimised
3 16 kHz var./drive-optimised
5 2 kHz constant/drive-optimised
6 4 kHz constant/drive-optimised
7 8 kHz constant/drive-optimised
8 16 kHz constant/drive-optimised
21 8 kHz var./drive-opt./4 kHz min
22 16 kHz var./drive-opt./4 kHz min
23 16 kHz var./drive-opt./8 kHz min