WEG CFW100 Programming Manual page 71

MOTOR CONTROL
P137 - Automatic Torque Boost
Range:
Properties:
Description:
The automatic torque boost compensates the voltage drop in the stator resistance because of active current.
Look at Figure 8.12 on page
modulation index defined by V/f curve.
P137 actuates similarly to P136, but the value set is applied proportionally to the output active current in relation to
the maximum current (2 x P295).
8 The setting criteria of P137 are the same as those of P136, that is, set the value as low as possible for the motor
start and operation at low frequencies, because values above those increase the losses, heating and overload of
the motor and inverter.
The block diagram of
increment of the voltage in the ramp output according to the increase of the active current.
Output
active current
P138 - Slip Compensation
Range:
Properties:
Description:
Parameter P138 is used in the motor slip compensation function, when set for positive values. In this case, it
8-22 | Micro Mini Drives
Output
voltage (%)
P142
P136
Figure 8.16: Torque boost region for quadratic V/f control mode
0.0 to 30.0 %
V/f
8-19, where variable IxR corresponds to the automatic torque boost action on the
Figure 8.17 on page 8-22
Frequency reference
P139
Figure 8.17: Block diagram of the automatic torque boost
-10.0 to 10.0 %
V/f
P145 P134
shows the automatic compensation action IxR responsible for the
I x R
P136
I x R
automatic
P137
Output
frequency (Hz)
P007
Voltage
applied on
the motor