User`s guide

102
CHAPTER 6 - DETAILED PARAMETER DESCRIPTION
Range
[Factory Setting]
Parameter
Unit
Description / Notes
Defines the inverter control mode. Item 5.3 gives some
guidelines relating to the selection of control mode.
P202
(3)
0 to 2
Control Mode
[ 0 ]
-
As shown in table above, there are 2 V/F control modes
and one vector control mode.
Scalar control modes:
LinearV/F control: this control mode ensures a flux in the
motor air gap approximatelyconstant from around
3
Hz
up to the field weakening
(defin
ed by the parameters
P142 and P145).
Thus in this speed range, an approximately constant
torque capacity is obtained.
This control mode is
recommended for belt conveyors, extruding machines,
etc.
Quadratic V/F control: in this control mode the flux in the
motor air gap is proportional to the output frequency up
to the field weakening point (defined at P142 and P145).
Thus the torque capacity is a quadratic function of the
speed. The main advantage of this type of control is the
energysaving capabilitywith variable torque loads, due
to the reduction of the motor losses (mainlydue to motor
iron losses and magnetic losses).
Main application fields for this type of control are:
centrifugalpumps, fans, multimotor drivings.
6.3.3
Configuration Parameters - P200 to P398
Output Voltage
P136 = 0
P142
0
P145
Output
Frequency
P202
0
1
2
Control Mode
Linear V/F Control (scalar)
Quadratic V/F Control (scalar)
Sensorless Vector Control
a) Linear V/F
Table 6.7
- Adjustment for each control mode
Figure 6.15 a)
- V/F control modes (scalar)