Special Functions; Pulse Width Modulation - BONFIGLIOLI ACTIVE CUBE 201 Operating Instructions Manual

19 Special functions

The configurable functions of the corresponding control methods enable another field of application of
the frequency inverters. The integration in the application is made easier by special functions.
19.1

Pulse width modulation

The motor noise can be reduced by switching parameter
frequency should be reduced to a maximum ratio of 1:10 to the frequency of the output signal for a
sine-shaped output signal. The maximum possible switching frequency depends on the drive output
and the ambient conditions. For the required technical data refer to the corresponding table and the
device type diagrams.
Parameter
No. Description
400 Switching frequency
The factory setting of parameter
30:
Configuration
1)
Configurations 1xx
2)
Configurations 2xx / 4xx
The heat losses increase proportionally to the load point of the frequency inverter and the switching
frequency. The automatic reduction adjusts the switching frequency to the current operating state of
the frequency inverter in order to provide the output performance required for the drive task at the
greatest possible dynamics and a low noise level.
The switching frequency is adjusted between the limits set with parameters
400 and
Min. Switching Frequency
400, automatic reduction will be disabled.
Switching Frequency
Parameter
No. Description
401 Min. Switching Frequency
The change of the switching frequency depends on the heat sink temperature switch-off limit and
the output current. The temperature limit to be exceeded so that the switching frequency is reduced
can be set via parameter
threshold set via parameter
again step by step.
Parameter
No. Description
580 Reduction limit Ti/Tk
The limit for the switching frequency reduction is influenced by the intelligent current
limits depending on the selected
have been switched off or provide the full overload current, the switching frequency is
reduced when the output current exceeds the limit of 87.5% of the long-term overload
current (60s). The switching frequency is increased if the output current drops below
the reference current of the next highest switching frequency.
234
Min.
2 kHz
Switching Frequency
401. If
Min. Switching Frequency
Min.
2 kHz
Reduction Limit Ti/Tc
Reduction Limit Ti/Tc
Min.
-25 °C
Operation Mode
Operating Instructions ACU
Switching Frequency
Setting
Max.
16 kHz
400 depends on the selected parameter
401 is higher or equal to
Setting
Max.
16 kHz
580. If the heat sink temperature falls below the
580 by 5 °C, the switching frequency is increased
Setting
Max.
0 °C
573 and the output current. If they
400. The switching
Factory setting
1)
2 kHz
2)
4 kHz
Switching Frequency
the
Factory setting
2 kHz
Factory setting
-4 °C
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