BONFIGLIOLI ACTIVE Cube ACU 201-01 Operating Instructions Manual page 135

Operation mode
Magnetization +
4 - current impr.+
IxR-K.
Magn. +
12 - current impr.+
w. ramp stop
Magn. +
current impr.+
14 -
w. R+
IxR-K.
In contrast to field-oriented control systems, sensorless control systems feature a
current controller which controls the starting behavior. The PI controller checks the
current impression by parameter
grating parts of current controller can be adjusted via parameters
and
Integral time
setting the parameters to 0.
No.
621 Amplification
622 Integral time
Operating Instructions ACU
06/13
620
In this operation mode, the current set with the parame-
ter
Current during flux-formation
the motor for magnetization after release. The output
frequency is kept at zero Hz for the
formation time
put frequency is increased according to the set accelera-
tion. If the output frequency reaches the value set with
the parameter
623 is withdrawn. There is a smooth transition to the V/f
characteristic, and a load-dependent output current is
obtained. At the same time, the increase of the output
voltage by the IxR compensation becomes effective as
from this output frequency. The V/f characteristic is dis-
placed by the portion of voltage which depends on the
stator resistance.
Operation mode 12 contains an additional function to
guarantee a starting behavior under difficult conditions.
The magnetization and starting current impression are
done according to operation mode 2. The ramp stop
takes the current consumption of the motor at the corre-
sponding operating point into account and controls the
frequency and voltage change by stopping the ramp. The
Controller status
controller by displaying the message "RSTP".
In this operation mode, the functions of operation mode
12 are extended by the compensation of the voltage drop
across the stator resistance. When the output frequency
reaches the value set with parameter
624, the increase of the output voltage by the IxR com-
pensation becomes effective. The V/f characteristic is
displaced by the portion of voltage which depends on the
stator resistance.
Starting current
622, respectively. The control functions can be deactivated by
Parameter
Description
Starting Behavior
781 is impressed into
Maximum flux-
780. After the time has elapsed, the out-
624, the
Frequency limit
275 signals the intervention of the
Frequency limit
623. The proportional and inte-
Amplification
Settings
Min. Max.
0.01 10.00
1 ms 30000 ms
Starting current
621
Fact. sett.
1.00
50 ms
135