Lenze 8400 - Page 259

Lenze · 8400 HighLine · Reference manual · DMS 12.0 EN · 06/2017 · TD23 259
5 Motor control (MCTRL)
5.10 Parameterisable additional functions
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Settable switching frequencies
 Tip!
The Lenze setting C00018
= "2: 8 kHz var.drive-opt." is the optimal value for standard
applications.
Preventing a decrease of the switching frequency
The value must not fall below the permissible switching frequency if the motor is not approved for
the setting switching frequency or if a sinusoidal filter is connected between the output of the
inverter and the motor that is not approved for the setting switching frequency.
In order to prevent a decrease of the switching frequency, the following settings have to be made:
1. The temporary switching frequency reduction has to be activated by the setting
C00144
= "0: Off".
2. The switching frequency has to be set in C00018
so that the value is not fallen below the
permissible switching frequency.
3. If a sinusoidal filter is available, only a drive-optimised switching frequency ("drive-opt.") is
permissible.
Example:
A sinusoidal filter is connected between the output of the inverter and the motor which
only is to be operated with a minimum switching frequency of 8 kHz.
In this case, only the following settings in C00018
are permissible:
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
Selection in C00018
7 8 kHz constant/drive-optimised
8 16 kHz constant/drive-optimised
23 16 kHz var./drive-opt./8 kHz min