Opr Error - Mitsubishi Electric MELSEC Q Series User Manual

14.2.7

OPR error

(1) When OPR cannot be completed
Check item
Does Near-point dog signal (DOG) stay off?
Does the speed change to the creep speed after Near-point
dog signal (DOG) turned on?
Does analog output from the QD73A1 continue after a Zero
signal input?
Does Zero signal stay off?
(2) When the OP position is in error
Check item
Do the position errors occur by regular amount?
Is the OPR completed near the position where Near-point
dog signal (DOG) turns on?
Is the OPR in the near-point dog method completed even
though the near-point dog did not turn off?
In the near-point dog method, is the movement amount after
near-point dog ON more than that of normal OPR completion
by one or more servomotor rotation?
Check if Near-point dog signal (DOG) is wired properly.
The QD73A1 may be broken. Please consult your local Mitsubishi
representative.
Check if Zero signal is wired properly.
[Near-point dog method]
If the position where the near-point dog turns off is near the position of a
Zero signal input, the Zero signal input may be misread. Adjust the position
where the near-point dog turns off to be closer to the center of Zero signals.
[Count method]
If the position after the move according to "
amount after near-point dog ON" is near the position of a Zero signal input,
the Zero signal input may be misread. Adjust "
movement amount after near-point dog ON" so that the position after the
move becomes closer to the center of Zero signals.
Near-point dog signal (DOG) may be chattering. Use a high-performance
near-point dog.
The contact or wiring of the near-point dog is not proper. Check the wiring.
Near-point dog signal (DOG) may be chattering when it turns off. Use a
high-performance near-point dog.
CHAPTER 14 TROUBLESHOOTING
Action
Action
Setting for the movement
Pr.13
Setting for the
Pr.13
14
249