Adjustable V/F Curve [24] - WEG CFW-11 Programming Manual

Scalar Control (V/f)
Description:
In order to get an overview of the control types, as well as orientation to choose the most suitable type for the
application, refer to the chapter 8 of the CFW-11 User Manual.
For the V/f mode, select P0202=0, 1 or 2:
Parameter P0202 setting for the V/f mode:
 P0202=0 for motors with rated frequency=60 Hz;
 P0202=1 for motors with rated frequency=50 Hz.
Notes:
 The correct setting of P0400 assures the application of the correct V/f ratio at the output, in case of
50 Hz or 60 Hz motors with voltage different from the inverter input voltage.
 P0202=2: for special motors with rated frequency different from 50 Hz or 60 Hz, or for the adjustment
of special V/f curve profiles. Example: the approximation of a quadratic V/f curve for energy saving in
variable torque loads like centrifuge pumps and fans.

9.2 aDjUStaBLe V/f cURVe [24]

P0142 – Maximum output Voltage
P0143 – intermediate output Voltage
P0144 – 3Hz output Voltage
Adjustable
Range:
P0145 – field Weakening Speed
P0146 – intermediate Speed
Adjustable
Range:
Proprieties:
Access groups
via HMI:
Description:
This function allows the adjustment of the curve that links output voltage and frequency by means of parameters, as
presented by the figure 9.8, in V/f mode.
It is necessary when the used motor has a rated frequency different from 50 Hz or 60 Hz, or when a quadratic V/f
9
curve, for energy saving in the operation of centrifuge pumps and fans, is desired, or even in special applications,
such as, for instance, when a transformer is used at the inverter output, between it and the motor.
9-6
0.0 to 100.0 %
0 to 18000 rpm
Adj and CFG
01 PARAMETER GROUPS
24 Adjust. V/f Curve
Factory P0142=100.0 %
Setting: P0143=50.0 %
P0144=8.0 %
Factory P0145=1800 rpm
Setting: P0146=900 rpm