SKS Sweden Bonfiglioli Vectron ACTIVE CUBE ACU 201 Series, Руководство по эксплуатации, Страница: 212 / 260

210
Operating Instructions ACU
09/08
Parameter Settings
No. Description Min. Max. Fact. sett.
726 Minimum acceleration 0.1 Hz/s 6500.0 Hz/s 1.0 Hz/s
727 Mech. time constant 1 ms 60000 ms 10 ms
For optimal setting, the acceleration pre-control is switched on and the mechanical
time constant is set to the minimum value. The output value of the speed controller
is compared to the minimum acceleration time during the acceleration processes. The
frequency ramp is to be set to the highest value occurring in operation at which the
output figure of the speed controller is not yet limited. Now, the value of the
Mini-
mum acceleration
726
is set to half the set acceleration ramp so that it is ensured
that the acceleration pre-control is active. The acceleration pre-control is not raised
by increasing the
Mech.time constant
727 until the output figure corresponds to the
time modification of the drive during the acceleration processes.
16.5.5 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 3-phase machine. 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
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
Optimization of the controller parameters of the field parameter should be done in
the basic speed range. The frequency to be set should be slightly lower than the limit
of the modulation controller selected via parameter
Reference modulation
750 so
that the modulation controller is not active. Optimization of the
Reference flux
717 is
only required in exceptional cases. The set percentage changes the flux-forming cur-
rent component proportionally to the torque-forming current component. The correc-
tion of the rated magnetizing current by means of the reference flux thus changes
the torque of the drive. If the parameter
Reference flux
717 is decreased drastically
(change-over from 100% to 50%), the set value I
sd
can be oscillographed. The
course of the signal of the flux-forming current I
sd
should reach the stationary value
after overshooting without oscillation. The integral time of the field controller should
be selected according to the half rotor time constant calculated by the software. The
actual value to be read out via parameter
Act. rotor time constant
227 is to be di-
vided by two and can be used in the first approach for the parameter
Integral time
field controller
742. If a quick transition into field weakening is necessary for the
application, the integral time should be reduced. The amplification is to be selected
relatively large in order to achieve a good dynamics of the controller. Attention
should be paid to the fact that an increased overshoot is necessary for a good control
behavior in controlling of a load with low-pass behavior, for example a 3-phase ma-
chine.
Operating Instructions ACU 09/08 210