BONFIGLIOLI ACTIVE Cube ACU 201-01 Operating Instructions Manual page 228

The set-up of the two current controllers is identical and enables joint setting of am-
plification as well as the integral time for both controllers. For this, the parameters
Amplification
tion and component of the current controllers can be switched off by setting the pa-
rameters to zero.
No.
700 Amplification
701 Integral time
The guided commissioning has selected the parameters of the current controller in
such a way that they can be used without having to be changed in most applications.
If, in exceptional cases, an optimization of the behavior of the current controller is to
be done, the reference value jump during the flux-formation phase can be used for
this. The reference value of the flux-forming current components leaps to the figure
Current during flux-formation
controlled to the magnetizing current after the expiry of the
780. The operating point necessary for the adjustment demands the setting of
time
parameter
after magnetizing. The measurement of the step response, which is defined by the
ratio of the currents mentioned, should be done in the motor supply line by means of
a measuring current transformer of a sufficient bandwidth.
The internally calculated actual value for the flux-forming current component cannot
be output via the analog output for this measurement as the time resolution of the
measurement is not sufficient.
To set the parameters of the PI controller, the
until the actual value overshoots distinctly during the control process. Now, the am-
plification is reduced to about fifty percent again and then the
synchronized until actual value overshoots slightly during the control process.
The settings of the current controllers should not be too dynamic in order to ensure a
sufficient reserve range. The control tends to increased oscillations if the reverse
range is reduced.
The dimensioning of the current controller parameters by calculation of the time con-
stant is to be done for a switching frequency of 2 kHz. For other switching frequen-
cies, the values are adapted internally so that the setting can remain unchanged for
all switching frequencies. The dynamic properties of the current controller improve if
the switching and scanning frequency increases.
The fixed time interval for the modulation results in the following scanning frequen-
cies of the current controller via parameter
Switching frequency
1)
This switching frequency can be set for parameter
228
700 and
Integral time
Parameter
Description
781 with suitable parameterization and then changes
418 to the value 0.00 Hz, as the drive is accelerated
Minimum Frequency
Settings
Scanning frequency
1)
2 kHz
4 kHz
8 kHz
12 kHz
16 kHz
Operating Instructions ACU
701 are available. The proportional and integra-
Settings
Min. Max.
0.00 8.00
0.00 ms 10.00 ms
Maximum flux-formation
Amplification
Switching frequency
2 kHz
4 kHz
8 kHz
8 kHz
8 kHz
Min. switching frequency
Fact. sett.
0.13
10.00 ms
700 is increased first
701 is
Integral time
400.
401.
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