Fuji Electric FRENIC-HVAC User Manual page 390

F42 Drive Control Selection 1
F42 specifies the motor drive control.
Data for
F42
V/f control with slip compensation
0
inactive
Dynamic torque vector control (with slip
1
compensation and auto torque boost)
2 V/f control with slip compensation active
V/f control with slip compensation inactive

Under this control, the inverter controls a motor with the voltage and frequency according to
the V/f pattern specified by function codes. This control disables all automatically controlled
features such as the slip compensation, so no unpredictable output fluctuation occurs,
enabling stable operation with constant output frequency.
V/f control with slip compensation active

Applying any load to an induction motor causes a rotational slip due to the motor
characteristics, decreasing the motor rotation. The inverter's slip compensation function first
presumes the slip value of the motor based on the motor torque generated and raises the
output frequency to compensate for the decrease in motor rotation. This prevents the motor
from decreasing the rotation due to the slip.
That is, this function is effective for improving the motor speed control accuracy.
Function code
P12 Rated slip frequency
P10 Slip compensation
response time
To improve the accuracy of slip compensation, perform auto-tuning.
H68 enables or disables the slip compensation function according to the motor driving
conditions.
Data for
H68
0
1
2
3
Drive control
Specify the rated slip frequency.
Specify the slip compensation response time.
Basically, there is no need to modify the default setting.
Motor driving conditions
Accel/Decel Constant speed
Enable Enable
Disable Enable
Enable Enable
Disable Enable
6-80
H68 (Slip Compensation 1, Operating conditions)
Basic Speed
control feedback
V/f
Disable
control
Operation
Motor driving frequency zone
Base frequency
or below
Enable
Enable
Enable
Enable
Speed control
Frequency control
Frequency control
with slip compensation
Above the base
frequency
Enable
Enable
Disable
Disable