Lenze 8600 series - Additional Open-Loop and Closed-Loop Control Functions; Chopper Frequency

6 Additional open-loop and closed-loop
functions
control
6.1 Chopper frequency
The controllers of the 8600 series offer the feature to adapt the
chopper frequency of the controller to the noise and smooth
running requirements of the motor. By increasing the chopper
frequency you tan generally reduce the motor noises which are
generated by the pulsating output voltage.
By reducing the chopper frequency the smooth running in the low
frequency range is often improved. Under code CO18 you tan
select a variable or fixed chopper frequency.
Variable chopper frequency
With a chopper frequency, from 4 to 16 kHz variable, the set
chopper frequency is maintained us long as the switching losses in
the controller allow for this. If an overload is recognized, the
chopper frequency is reduced automatically to the extent as it is
necessary to continue Operation. If the motor current is reduced
again, the chopper frequency is increased.
Fixed chopper frequency
When a fixed chopper frequency is set, the chopper frequency is
not reduced in case of overload. A fixed chopper frequency is
useful only when the reduction of the motor noise is important in
every operating state or if motor noise filters are used. By reducing
the maximum current internally, the overload capacity is restricted.
Code Name
CO1 6 Chopper
frequency
Parameter (Factory setting is printed in bold)
-o- 1 kHz (field frequency max. 120 Hz)
-l- 2kHz (field frequency max. 240 Hz)
-2- 4kHz variable
-3. 6kHz variable
-4- 8kHz variable
-5-
12kHz variable
-6- 16kHz variable
-7- 12kHz fixed (for sine filter)
-a- 16kH.z fixed (for sine filter)
Acceptance
[SH + PRG]
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96
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lenze