Starting Current - BONFIGLIOLI ACTIVE CUBE 201 Operating Instructions Manual

Operation Mode 620
Magnetization
4 - + current
impr.+ I*R-Comp.
Magn.+
12 - Curr.Imp.
w. Ramp Stop
Magn.+
Curr.Imp.
14 -
w. RS.+
I*R-Comp.
In contrast to field-oriented control systems, sensorless control systems feature a current controller
which controls the starting behavior. The PI controller controls the current impress of parameter
623. The proportional and integrating part of the current controller can be set via

Starting Current

parameters
Amplification
setting the parameters to 0.
Parameter
No. Description
621 Amplification
622 Integral Time
13.1.1.1 Starting current
The
Starting Current
is reached.
Frequency Limit624
Applications in which high current is permanently needed at a low speed are to be realized using
forced-ventilated motors to prevent thermal overload.
Parameter
No. Description
62
Starting current
3
I = Rated frequency inverter output current
FIN
o: Overload capacity of frequency inverter.
12/16
In this operation mode, the current set with the parameter
during Flux-Formation
magnetization after release. The output frequency is kept at 0 Hz for the
Max. Flux-Formation Time
frequency is increased according to the set acceleration. Once the
output frequency reaches the value set with parameter
624, the
Starting Current
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 displaced 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
corresponding operating point into account and controls the frequency
and voltage change by stopping the ramp. The
signals intervention of the controller by displaying 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
Frequency Limit
the IxR compensation becomes effective. The V/f characteristic is
displaced by the portion of voltage which depends on the stator
resistance.
621 and
Integral Time
623 ensures, particularly for high-torque start, a sufficient torque until the
Operating Instructions ACU
Starting behavior
781 is impressed into the motor for
780. Once this time has elapsed, the output
623 is withdrawn. There is a smooth
624, the increase of the output voltage by
622. The control functions can be deactivated by
Setting
Min. Max.
0.01 10.00
1 ms 30 000 ms
Setting
Min. Max.
0.0 A oI
FIN
Current
Frequency Limit
275
Controller Status
Factory setting
1.00
50 ms
Factory setting
I
FIN
133