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