Lenze E84DSxxx - Manual (Page 149)

Lenze · 8400 protec StateLine · Reference manual · DMS 4.2 EN · 03/2013 · TD05
149
5 Motor control (MCTRL)
5.7 Parameterisable additional functions
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5.7 Parameterisable additional functions
5.7.1 Selection of the 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

Tip!
The Lenze setting
C00018 = 2 (8 kHz var./drive-opt.) is the optimal value for standard
applications.

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 ( 111)

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