Parameterisable Additional Functions - Lenze 8400 StateLine C Reference Manual

5.9

Parameterisable additional functions

5.9.1 Selection of switching frequency
The switching frequency of the inverter that can be selected in
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.

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

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 2.4 and 8 kHz.
Settable switching frequencies
Selection in C00018
1 4 kHz var./drive-optimised
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
11 4 kHz var./min. Pv
12 8 kHz var./min. Pv
13 16 kHz var./min. Pv
15 2 kHz constant/min. Pv
16 4 kHz constant/min. Pv
17 8 kHz constant/min. Pv
18 16 kHz constant/min. Pv
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8400 StateLine C | Reference manual
Parameterisable additional functions
( 122)
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
31 8 kHz var./min. Pv/4 kHz min
32 16 kHz var./min. Pv/4 kHz min
33 16 kHz var./min. Pv/8 kHz min
Abbreviations used:
• "var.": Adaptation of the switching frequency
depending on the current
• "drive-opt.": drive-optimised modulation ("sine/delta
modulation")
• "fixed": fixed switching frequencies
• "min. Pv": additional reduction of power loss
L
Motor control (MCTRL)
C00018 influences the
193