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
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:
Properties:
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 on page
9
It is necessary when the used motor has a rated frequency different from 50 Hz or 60 Hz, or when a quadratic V/f
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.
The function is activated with P0202 = 2 (Adjustable V/f).
9-6
Chapter 8 AVAILABLE CONTROL TYPES on page
0.0 to 100.0 %
0 to 18000 rpm
Adj and CFG
01 PARAMETER GROUPS
24 Adjust. V/f Curve
9-7, in V/f mode.
8-1.
Factory P0142 = 100.0 %
Setting: P0143 = 50.0 %
P0144 = 8.0 %
Factory P0145 = 1800 rpm
Setting: P0146 = 900 rpm