Switching frequency changeover
The output voltage of the inverter is a DC voltage with sine-coded pulse width modulation (PWM). This corresponds by approximation to an AC voltage with variable frequency. The frequency of the PWM pulses is adjustable and is called "switching frequency".
Not all products support all options.
Details
The switching frequency has an impact on the smooth running performance
and the noise generation in the motor connected as well as on the power loss in the inverter.
The lower the switching frequency, the better the concentricity factor, the smaller the power loss
and the higher the audible noise .
and the noise generation in the motor connected as well as on the power loss in the inverter.
The lower the switching frequency, the better the concentricity factor, the smaller the power loss
and the higher the audible noise .
Parameter
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Address
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Name / setting range / [default setting]
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Information
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|
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0x2939
(P305.00)
|
Switching frequency
(Switching freq.)
* Default setting dependent on the model.
|
Selection of the inverter switching frequency.
Abbreviations used:
–
"Variable": Adaptation of the switching frequency as afunction of the current. The carrier frequency is reduced depending on the heat sink temperature and the ixt load.
–
"Fixed": The carrier frequency is fixed, no frequency reduction.
–
"Drive-optimised": reduces the capacitive currents from the motor to the earth.
–
"Min. Pv": reduces the capacitive currents from the motor to the earth and optimizes power dissipation.
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1
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4 kHz variable / drive-optimised
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2
|
8 kHz variable / drive-optimised
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3
|
16 kHz variable / drive-optimised
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5
|
2 kHz fixed / drive-optimised
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6
|
4 kHz fixed / drive-optimised
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7
|
8 kHz fixed / drive-optimised
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8
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16 kHz fixed / drive-optimised
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11
|
4 kHz variable / min. Pv
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12
|
8 kHz variable / min. Pv
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13
|
16 kHz variable / min. Pv
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15
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2 kHz fixed / min. Pv
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16
|
4 kHz fixed / min. Pv
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17
|
8 kHz fixed / min. Pv
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18
|
16 kHz fixed / min. Pv
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21
|
8 kHz variable / drive-optimised / 4 kHz min.
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22
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16 kHz variable / drive-optimised / 4 kHz min.
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23
|
16 kHz variable / drive-optimised / 8 kHz min.
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31
|
8 kHz variable /min. Pv / 4 kHz min.
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32
|
16 kHz variable /min. Pv / 4 kHz min.
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33
|
16 kHz variable /min. Pv / 8 kHz min.
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0x293A
(P116.00)
|
Actual switching frequency
(Actual sw. freq.)
–
Read only
|
Display of the currently active switching frequency of the inverter.
Example:
–
"16 kHz variable / drive-optimised / 4 kHz min. [22]" is selected as switching frequency in 0x2939 (P305.00).
–
An increase of the ambient temperature and/or the load have caused a decrease of the switching frequency to 8 kHz. In this case, this parameter indicates the selection "8 kHz power loss-optimized [7]".
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1
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2 kHz drive-optimized
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2
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4 kHz drive-optimized
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3
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8 kHz drive-optimized
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4
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16 kHz drive-optimized
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5
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2 kHz power loss-optimized
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6
|
4 kHz power loss-optimized
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7
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8 kHz power loss-optimized
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8
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16 kHz power loss-optimized
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