F-Characteristic - BONFIGLIOLI ACTIVE Cube ACU 201-01 Operating Instructions Manual

16 V/f-Characteristic
The sensorless control in configurations 110 and 111 is based on the proportional
change of output voltage compared to the output frequency according to the config-
ured characteristic.
By setting the V/f-characteristic, the voltage of the connected 3-phase motor is con-
trolled according to the frequency. The torque to be applied by the motor at the cor-
responding operating point demands the control of the output voltage proportional to
the frequency. At a constant output voltage / output frequency ratio of the frequency
inverter, the magnetization is constant in the nominal operating range of the 3-phase
motor. The rating point of the motor or end point of the V/f-characteristic is set via
the guided commissioning with the parameter
meter
Cut-off frequency
The lower frequency range, where an increased voltage is necessary for the start of
the drive, is critical. The voltage at output frequency = zero is set with the parameter
Starting voltage
V/f-characteristic can be defined by the parameters
602. The percentage parameter figure is calculated from the linear V/f-char-
quency
acteristic. Via the parameters
419, the working range of the machine or the V/f-characteristic is defined.
(FMIN):
Minimum frequency
(US):
Starting voltage
(UK):
Voltage rise
(UC):
Cut-off voltage
No.
600 Starting voltage
601 Voltage rise
602 Rise frequency
603 Cut-off voltage
604 Cut-off frequency
The guided commissioning takes the parameterized rated motor values and reference
data of the frequency inverter into account when it comes to pre-setting the V/f-
characteristic. In the case of three-phase machines, the speed can be increased at a
constant torque if the motor winding can be switched over from star to delta connec-
tion. If the data for delta connection indicated on the rating plate of the three-phase
motor were entered, the cut-off frequency is increased automatically by the square
root of three.
208
604.
600. An increase in voltage deviating from the linear course of the
Minimum frequency
418 (FMIN)
U
Working range
603 (UC)
601 (UK)
600 (US)
602 (FK)
418, (FMAX):
600,
601, (FK):
Rise frequency
603, (FC):
Cut-off frequency
Parameter
Description
Operating Instructions ACU
Cut-off voltage
Voltage rise
418 and
Maximum frequency
419 (FMAX)
604 (FC)
419,
Maximum frequency
602
604
Settings
Min. Max.
0.0 V 100.0 V
-100 % 200 %
0 % 100 %
60.0 V 560.0 V
0.00 Hz 999.99 Hz
603 and the para-
601 and
Rise fre-
f
Fact. sett.
5.0 V
10 %
20 %
400.0 V
50.00 Hz
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