Firmware ≤ 11.00 - DMS 8.0 EN - 10/2011 L 193
8400 StateLine C | Reference manual
Motor control (MCTRL)
Parameterisable additional functions
5.9 Parameterisable additional functions
5.9.1 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.
Settable switching frequencies
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
( 122)
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.
Selection in C00018
1 4 kHz var./drive-optimised 21 8 kHz var./drive-opt./4 kHz min
2 8 kHz var./drive-optimised 22 16 kHz var./drive-opt./4 kHz min
3 16 kHz var./drive-optimised 23 16 kHz var./drive-opt./8 kHz min
5 2 kHz constant/drive-optimised 31 8 kHz var./min. Pv/4 kHz min
6 4 kHz constant/drive-optimised 32 16 kHz var./min. Pv/4 kHz min
7 8 kHz constant/drive-optimised 33 16 kHz var./min. Pv/8 kHz min
8 16 kHz constant/drive-optimised 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
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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