Further Setting Options; V/F Characteristic; Linear V/F Characteristic - BONFIGLIOLI Agile Operating Instructions Manual

Parameter descriptions
7.6.7.4

Further setting options

An offset can be set via the reference frequency channel or via the function of the electronic gear. For
example, you can
475 = "10 - Repetition Frequency" and
Source 1
Frequency". Via the fixed frequencies (parameters 480 ... 488), you can set the required offset.
A filter can be set via PLC-function (see application manual "PLC").
7.7

V/f characteristic

606 Type V/f characteristic
Via parameter
Type V/f Characteristic
Type
1 - Linear
2 - Quadratic
7.8

Linear V/f characteristic

600 Starting Voltage
601 Voltage Rise
602 Rise Frequency
603 Cut-Off Voltage
604 Cut-Off Frequency
The sensorless control in configuration 110 (parameter
al change of output voltage compared to the output frequency according to the configured character-
istic.
By setting the V/f-characteristic, the voltage of the connected 3-phase motor is controlled according to
the frequency. The torque to be applied by the motor at the corresponding 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
604.
Frequency
The lower frequency range, where an increased voltage is necessary for the start of the drive, is criti-
cal. The voltage at an output frequency of zero is set with parameter
increase deviating from the linear course of the V/f-characteristic can be defined by parameters
601 and
age Rise Rise Frequency
V/f-characteristic. Via the parameters
working range of the motor or the V/f-characteristic is defined.
V/f characteristic
set in the reference
606, you can set the characteristic to linear or quadratic.
Linear V/f characteristic: |U|~ f. Factory setting.
Quadratic V/f characteristic: |U| ~ f
creases quadratically to the speed. Suitable for energy saving.
See chapter 8.2 "Quadratic V/f characteristic".
Too small set values of the V/f characteristic affect the dynamic behavior of
the drive.
602. The parameter value percentage is calculated from the linear
Minimum Frequency
frequency channel:
Reference Frequency Source 2
Function
2
. For applications where the torque in-
30) is based on the proportion-
Configuration
603 and the parameter
Cut-Off Voltage
Starting Voltage
418 and
Maximum Frequency
211
06/2013 Operating Instructions
Reference Frequency
492 = "3 - Fixed
Cut-Off
600. A voltage
Volt-
419, the
Agile