BONFIGLIOLI ACTIVE Cube ACU 401-18 User 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-
re
sponding 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 Cut-off voltage 603 and the para-
meter
Cut-off frequency 604.
The lower frequency range, where an increased voltage is necessa
ry for the start of
the drive, is critical. The voltage at output frequency = zero is set with the parameter
Starting voltage 600
. An increase in voltage deviating from the linear course of the
V/f-characteristic can be defined by the parameters Voltage rise 601 and Rise fre-
quency
602. The percentage parameter figure is calculated from the linear V/f-char-
acteristic. Via the parameters
Minimum frequency 418 and Maximum frequency
419, the working range of the machine or the V/f-characteristic is defined.
603 (UC)
601 (UK)
600 (US)
U
418 (FMIN)
419 (FMAX)
602 (FK)
604 (FC) f
Working range
(FMIN):
Minimum frequency 418
, (FMAX):
Maximum frequency 419
,
(US): Starting voltage 600,
(UK): Voltage rise 601, (FK): Rise frequency 602
(UC): Cut-off voltage 603, (FC): Cut-off frequency 604
Parameter Settings
No. Description Min. Max. Fact. sett.
600 Starting voltage 0.0 V 100.0 V 5.0 V
601 Voltage rise -100 % 200 % 10 %
602 Rise frequency 0 % 100 % 20 %
603 Cut-off voltage 60.0 V 560.0 V 400.0 V
604
Cut-off frequency
0.00 Hz
999.99 Hz
50.00 Hz
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 connec
tion 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 Operating Instructions ACU 06/13

BONFIGLIOLI ACTIVE Cube ACU 401-18 Specifications

General

Brand	BONFIGLIOLI
Model	ACTIVE Cube ACU 401-18
Category	Inverter
Language	English