WEG CFW-11 Programming Manual page 108

Scalar Control (V/f)
The energy saving function reduces the motor losses when it is running with loads significantly below the rated
load. The efficiency is increased by reducing the motor flux, which is kept saturated for any load value.
The function is active when the applied load is smaller than the value set in P0588, and the motor effective
speed is higher than the value set in P0589. Furthermore, in order to avoid the stalling of the motor, the applied
voltage is limited to a minimum acceptable P0590.
P0407 – Motor Rated Power Factor
Adjustable
Range:
Properties:
Access groups
via HMI:
Description:
Setting of the motor rated power factor.
In order to obtain the proper operation of the energy saving function, the motor power factor must be correctly set,
according to the information on the motor nameplate.
Note: With the motor nameplate data and for applications with constant torque, the motor optimum efficiency is
normally obtained with the energy saving function active. In some cases, the output current may increase, and then
it is necessary to gradually reduce the value of this parameter to the point in which the current value remains equal
to or below the current value obtained with the function disabled.
For information regarding the actuation of P0407 in the VVW control mode, refer to
[43] on page 10-3.
P0588 – Maximum Torque Level
Adjustable
Range:
Properties:
Access groups
via HMI:
Description:
This parameter defines the torque value to activate the operation of the energy saving function. Setting this parameter
to zero disables the function. It is recommended to set this parameter to 60 %, but it has to be set according the
application requirements.
9
9-14
0.50 to 0.99
cfg, V/f, VVW
0 to 85 %
cfg, V/f
Factory 0.68
Setting:
Section 10.2 MOTOR DATA
Factory 0 %
Setting: