Mitsubishi FR-A800

Position control under vector control and PM sensorless vector control
PARAMETERS
253
5
Flowcharts
NOTE
• The speed command of position control is related to speed control. (Refer to page 177.)
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Parameters referred to
Pr.7 Acceleration time page 285
Pr.8 Deceleration time page 285
Pr.72 PWM frequency selection page 277
Pr.800 Control method selection page 164
Pr.802 Pre-excitation selection page 605
Pr.819 Easy gain tuning selection page 192
Pr.820 Speed control P gain 1 page 192
Pr.821 Speed control integral time 1 page 192
Motor or machine is
hunting.
Y
N
Decrease
the position loop gain
(Pr. 422).
Set the electronic gear.
(Pr. 420, Pr. 421)
N
Have you made
the electronic gear
setting?
Y
Y
N
Perform easy gain tuning.
The speed control gain is high.
Decrease the speed control
proportional gain (Pr. 820).
Increase the speed control
integral time (Pr. 821).
Machine operation is
unstable.
Y
N
Do not turn off the forward
(reverse) rotation stroke end
signal before completion of
positioning.
Y
The forward (reverse)
rotation stroke end signal has
turned off before completion
of positioning.
N
Y
Position shift occurs.
N
Insufficient torque.
Increase the excitation
ratio (Pr. 854).
Check the speed
control measures.
N
Y
Position control is not
exercised normally
Have you checked
the speed control items?
Please contact your sales
representative.
The position loop gain
(Pr. 422) is high.