81
DETAILED PARAMETER DESCRIPTION
Range
[factory Setting]
Parameter Unit Description / Notes
Defines the inverter control mode. Item 4.3 gives some guidelines
relating to the selection of control type.
P202
(1)
0...2
Type of Control [ 0 - V/F linear ]
-
As shown in table above, there are 2 V/F control modes:
- Linear V/F control: this control mode ensures a flux in the motor
air gap approximately constant from around 3Hz up to the field
weakening (defined 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 function of the quadratic speed. The main advantage
of this type of control is the energy saving capability with variable
torque loads, due to the reduction of the motor losses
(mainly due to motor iron losses and magnetic losses).
Main application fields for this type of control are: centrifugal pumps,
fans, multimotor drivings.
6.3.3 Configuration Parameters - P200 ... P398
Output Voltage
P136=0
P142
0
P145
Output
Frequency
Output Voltage
P136=0
P142
0
P145
Output
Frequency
(a) Linear V/F (b) Quadratic V/F
Figure 6.15 -V/F control modes (scalar)
(1)
This parameter can be changed only with the inverter disabled (motor stopped).
P202
0
1
2
Type of Control
Linear V/F Control (scalar)
Quadratic V/F Control (scalar)
Vector Control
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