BONFIGLIOLI ACTIVE Cube ACU 401-18 User Manual

17.5.6 Field Controller
The flux-forming current component is controlled by the field controller. The guided
commissioning optimizes the parameters of the field con
troller by measuring the time
constant and magnetizing curve of the connected 3-phase
machine. The parameters
of the field controller are selected such that they can be used without changes in
most applications. The pro
portional and the integrating part of the field controller are
to be set via parameters
Amplification
741 and
Integral time
742.
Parameter Settings
No.
Description
Min.
Max.
Fact. sett.
717 Reference Flux 0.01 % 300.00 % 100.00 %
741 Amplification 0.0 100.0 5.0
742 Integral time 0.0 ms 1000.0 ms 100.0 ms
Please note that changes within the Field controller parameters should only be done
in the basic speed area.
When an optimization of the Field controller is necessary, set the Integral Time 742
= Act. Rotor Time Constant 227 / 2, meaning to the half of the rotor tim
e constant.
In most application cases, this change is sufficient.
When further optimizations are necessary, follow the step described in the following
procedure.
•
Set the output frequency in a way (i.e. via the frequency reference value),
that the actual value Modulation 223 = 80…90 %
Reference Modulation
750.
• Now change the Flux Reference Value 717 from 100 % to 90 %. Oscillo-
graph the actuating variable I
sd
. The course of the signal of the flux-
forming
current I
sd
should reach the stationary value after overshooting without oscil-
lation.
• Change the parameters Amplification 741 and Integral Time 742
according
to the application requirements.
• Change the Flux Reference Value 717
back to 100 % und repeat the flux
reference step while you can analyze the changes with the oscillograph. Re-
peat these steps if necessary.
If a quick transition into field weakening is necessary for the application, the integral
time should be reduced. Increase the Amplification 741
in order to achieve a good
dynamism of the controller.
An increased overshoot is necessary for a good control behavior in controlling of a
load with low-pass behavior, e.g. an asynchronous motor.
06/13 Operating Instructions ACU 237

BONFIGLIOLI ACTIVE Cube ACU 401-18 Specifications

General

Brand	BONFIGLIOLI
Model	ACTIVE Cube ACU 401-18
Category	Inverter
Language	English