Fuji Electric Frenic-Sce, Instruction Manual

Page: 49 / 78

5-13
F42 Drive control selection 1
Related function codes: H68 Slip Compensation 1
(Operating conditions)
F42 specifies the motor drive control.
F42 data Control mode Basic control Speed feedback Speed control
0 V/f control without slip compensation
V/f control
Disable
Frequency control
1
Vector control without speed sensor
(dynamic torque vector)
With slip
compensation
Frequency control
2 V/f control with slip compensation
3 V/f control with speed sensor
Enable
Frequency control
with automatic
speed regulator
(ASR)
4
V/f control with speed sensor and auto
torque boost
6
Vector control for induction motor with
speed sensor
Vector control
Speed control with
automatic speed
regulator (ASR)
15
Vector control for synchronous motor
without speed sensor and pole
position sensor
Estimated speed

V/f control without slip compensation
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
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 Action
P12 Rated slip frequency Specify the rated slip frequency.
P09
Slip compensation gain for
driving
Adjust the slip compensation amount for driving.
Slip compensation amount for driving = Rated slip x Slip compensation
gain for driving
P11
Slip compensation gain for
braking
Adjust the slip compensation amount for braking.
Slip compensation amount for braking = Rated slip x Slip compensation
gain for braking
P10
Slip compensation
response time Specify the slip compensation response time. Basically, there is no need
to modify the setting.
To improve the accuracy of slip compensation, perform auto-tuning.
H68 enables or disables the slip compensation function 1 according to the motor driving conditions.
H68 data
Motor driving conditions Motor driving frequency zone
Accel/Decel
During constant
speed
Base frequency or
below
Above the base
frequency
0 Enable Enable Enable Enable
1 Disable Enable Enable Enable
2 Enable Enable Enable Disable
3 Disable Enable Enable Disable