In order to compensate for low-frequency torque
characteristics, users can make some boost
compensation to the output voltage. P04.01 is
relative to the max. output voltage V
b.
P04.02 defines the percentage of cut-off
frequency of manual torque boost to the rated
motor frequency f
b.
Torque boost can improve
the low-frequency torque characteristics of V/F.
Users should select torque boost based on the
load, eg, larger load requires larger torque
boost, however, if the torque boost is too large,
the motor will run at over-excitation, which will
cause increased output current and motor
heat-up, thus degrading the efficiency.
When torque boost is set to 0.0%, the VFD is
automatic torque boost.
Torque boost cut-off threshold: Below this
frequency threshold, the torque boost is valid,
exceeding this threshold will nullify torque boost.
When P04.00 =1 (multi-point V/F curve), users
can set V/F curve via P04.03–P04.08.
V/F curve is usually set according to the
characteristics of motor load.
Note: V1<V2<V3, f1<f2<f3. If low-frequency
voltage is set too high, motor overheat or
burnt-down may occur, and overcurrent stall or
overcurrent protection may occur to the VFD.
To Next Page
Loading...
Need help?
General
