Mitsubishi Electric 800 Series Instruction Manual page 239

Position control under vector control
Flowchart
Please contact your sales
representative.
NOTE
• The speed command of position control is related to speed control. (Refer to
Parameters referred to ???????
Pr.7 Acceleration time page 269
Pr.8 Deceleration time page 269
Pr.72 PWM frequency selection
Pr.800 Control method selection
Pr.802 Pre-excitation selection
Pr.819 Easy gain tuning selection
Pr.820 Speed control P gain 1
Pr.821 Speed control integral time 1
238
PARAMETERS
Position control is not
exercised normally
N
Have you checked
the speed control items?
Y
Y
Position shift occurs.
N
The forward (reverse)
rotation stroke end signal has
turned off before completion
Y
Motor or machine is
hunting.
N
The position loop gain
Decrease
the position loop gain
(Pr. 422).
Y
Machine operation is
unstable.
Insufficient torque.
Increase the excitation
N
ratio (Pr. 854).
page 261
page 137
page 599
page 164
page 164
page 164
Check the speed
control measures.
Have you made
N
the electronic gear
setting?
Set the electronic gear.
Y
(Pr. 420, Pr. 421)
Y
of positioning.
Do not turn off the forward
(reverse) rotation stroke end
signal before completion of
N
positioning.
N
(Pr. 422) is high.
Y
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).
page 147.)