SKS Sweden Bonfiglioli Vectron ACTIVE CUBE ACU 201 Series, Руководство по эксплуатации, Страница: 187 / 260

09/08
Operating Instructions ACU
185
15 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 confi-
gured 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
Cut-off voltage
603 and the para-
meter
Cut-off frequency
604.
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
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
Note: 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 connection. 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.
Operating Instructions ACU 185 09/08