Position Control Is Not Exercised Normally - Mitsubishi Electric FR-V500 Instruction Manual

Position control (Pr. 419 to Pr. 430,
Pr. 464 to Pr. 494)

2.7.12 Position control is not exercised normally

(1) Position control
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REMARKS
The speed command of position control relates to speed control. Refer to the Instruction Manual (basic) for details.
Position control is not
exercised normally.
N
Have you checked the
speed control items?
Check the speed
Y
control techniques.
Y
Does a position
shift occur?
N
Have you made the
electronic gear setting?
Has the forward (reverse)
rotation stroke end signal
turned off before
completion of positioning?
Y
Is the motor or
machine hunting?
N
Is the position loop gain
(Pr. 422) high?
Decrease the position
loop gain (Pr. 422).
Y
Is machine operation
unstable?
Torque is insufficient.
N Increase the excitation
ratio (Pr. 854).
Y
N
Set the electronic gear
Y
(Pr. 420, Pr. 421).
Y
Do not turn off the forward
(reverse) rotation stroke end
N
signal before completion of
positioning.
N
Y
Perform easy gain tuning.
The speed control gain is high.
Decrease the speed control
P gain (Pr. 820).
Increase the speed control
integral time (Pr. 821).
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