Field Weakening Corner - KEB COMBIVERT F5 Instruction Manual

Advanced Parameters
This parameter provides a better adjustment of the field weakening torque curve.
US. 19
Under certain situations, if the input voltage is sagging too low or the motor has very
high slip, it is possible that the voltage limit might be reached. This can be confirmed
Field
by monitoring ru.42. If ru.42 reaches 100% or more the drive is operating at the
Weakening
voltage limit and potentially can cause poor control of the motor.
Corner
To prevent this from happening the drive has an adjustable torque curve which
prevents the voltage limit from being reached. This value of this parameter is normally
calculated when the motor data is loaded in the LF parameters. After entering the
data, this value can be fine tuned.
Unit:
Value range:
Factory setting :
Adjustment values: increment /decrement by steps of 10%
LF.36
1.5xT
102
1 rpm
0..4000
calculated from motor data
Torque
(lbft)
rated
T
rated
Torque Limit
Curve
LF.16 US.19
Speed
(rpm)