Field Controller - BONFIGLIOLI ACTIVE CUBE 201 Operating Instructions Manual

18.5.6

Field controller

The flux-forming current component is controlled by the field controller. The guided commissioning
optimizes the parameters of the field controller by measuring the time constant and magnetizing
curve of the connected asynchronous motor. The parameters of the field controller are selected such
that they can be used without changes in most applications. The proportional and the integrating
part of the field controller are to be set via parameters
Parameter
No. Description
717 Reference Flux
741 Amplification
742 Integral Time
Please note that any changes of the field controller should only be made in the base speed range.
If the field controller must be optimized, set the
227 / 2, i.e. half the rotor time constants. In most applications, this change will be
Time Constant
sufficient.
If additional optimization is required, please proceed as follows:
First set the output frequency (e.g. via reference frequency) such that the actual value
223 = 80...90 %
Reference Modulation
Now, change parameter
The course of the signal of the flux-forming current I
overshooting without oscillation.
Adjust parameters
Amplification
requirements.
Change the
Reference Flux
the changes by means of oscillography. Repeat these steps if necessary.
If a quick transition into field weakening is necessary for the application, the integral time should be
reduced.
For good dynamic behavior, choose a relatively high value for
Note that high overshoot is necessary for good control behavior in controlling of a load with low-
pass behavior, for example a 3-phase machine.
Parameter
Reduction Factor Flux
selected with "Stop" function. This stopping behavior is selected if Parameter
is set to 2x (20 ... 27 – "R->0, Stop, ... ") or x2 (2, 12, 22, 32, 42, 52, 62, 72 – " ... , R->0, Stop").
The stopping behavior is described in Chapter "".
In these operation modes, the setting for
set in parameter
Holding Time
factors
Reference Flux
start immediately and the flux will increase to the reference flux while the drive is running.
Due to the reduced flux, a higher torque-forming current component Isq is needed when the drive is
starting. The time required to reach the reference flux can be influenced via parameter
743. This parameter is set to the rated motor current during guided commissioning.
Upper Limit
Parameter
No. Description
778 Reduction Factor Flux
12/16
Min.
0.01%
0.0
0.0 ms
750.
717 from 100 % to 90 %. While doing so, oscillograph I
Reference Flux
741 and
717 back to 100 % and repeat the reference flux jump, while analyzing
778 reduces the stall current when a stopping behavior is
Reduction Factor Flux
638 has elapsed. The resulting stall flux is calculated from the
717 and
Reduction Factor Flux
Min.
20.00%
Operating Instructions ACU
741 and
Amplification
Setting
Max.
300.00%
100.0
1000.0 ms
Field Controller Integral Time
should reach the stationary value after
sd
742 according to the application
Integral Time
Amplification
778 will be effective once the time
778. After a start command, the drive will
Setting
Max.
100.00%
742.
Integral Time
Factory setting
100.00%
5.0
100.0 ms
742 =
Act. Rotor
Modulation
.
sd
741 of the controller.
630
Operation Mode
Ref. Isd
Factory setting
100.00%
231