SKS Sweden Bonfiglioli Vectron ACTIVE CUBE ACU 201 Series, Operating Instructions Manual, Page: 209 / 260

09/08
Operating Instructions ACU
207
clockwise
anticlockwise
generator
motor
motor generator
n
clockwise
anticlockwise
generator
motor
motor
generator
n
Operation mode 2
Current limit
728
Current limit generator op.
729
The properties of the speed controller can be adapted for adjustment and optimiza-
tion of the controller. The amplification and integral time of the speed controller are
to be set via the parameters
Amplification 1
721,
Integral time 1
722. For the
second speed range, the parameters can be set via the parameters
Amplification 2
723
,
Integral time 2
724. The distinction between the speed ranges is done by the
parameter
Speed control switch-over limit
738
. The parameters
Amplification 1
721
and
Integral time 1
722 are taken into account with the parameter
Speed control
switch-over limit.
If parameter
Speed control switch-over limit
738
is set to a value
higher than 0.00 Hz, parameters
Amplification 1
721,
Integral time 1
722 are active
below the limit and parameters
Amplification 2
723,
Integral time 2
724 are active
above the limit.
The parameterized amplification at the current operating point can additionally be as-
sessed via the parameter
Backlash damping
748
depending on the control deviation.
In particular the small signal behavior in applications with a gearbox can be improved
by a value higher than zero percent.
Parameter
Backlash damping
748 is available depending on the type of unit.
Parameter Settings
No. Description Min. Max. Fact. sett.
721 Amplification 1 0.00 200.00 -
1)
722 Integral time 1 0 ms 60000 ms -
1)
723 Amplification 2 0.00 200.00 -
1)
724 Integral time 2 0 ms 60000 ms - 1)
738 Speed control switch-over limit 0.00 Hz 999.99 Hz 55.00 Hz
748 Backlash damping 0 % 300 % 100 %
1)
The default setting is relative to the recommended machine data for the amplifica-
tion and integral time. This enables a first function test in a large number of appli-
cations. Switch-over between settings 1 and 2 for the current frequency range is
done by the software according to the selected limit value.
The optimization of the speed controller can be done with the help of a reference
value leap. The amount of the leap is defined by the set ramp or limitation. The op-
timization of the PI controller should be done at the maximum admissible reference
figure change rate. First, the amplification is increased until the actual value over-
shoots distinctly during the control process. This is indicated by a strong oscillation of
the speed and by the running noises. In the next step, reduce the amplification
slightly (1/2 ...3/4 etc.). Then reduce the integral time (larger I component) until the
actual value overshoots only slightly in the control process.
If necessary, check the speed control settings in the case of dynamic operations (ac-
celeration, deceleration). The frequency at which a switch-over of the controller pa-
rameters is affected can be set via parameter
Speed control switch-over limit
738.
Operating Instructions ACU 207 09/08