Mitsubishi Electric MELDAS 600M Series Instruction Manual page 393

(6) Grid mask amount (150005 Grmask)
The electrical zero point is the first grid point after the dog is kicked.
If the grid point is at the position where the near-point dog is kicked, the electrical zero point will be
the grid point at the position where the dog is kicked because of the delay of the limit switch
operation. Thus, the next grid point will be applied, or in the end, the reference point position may
be deviate by the amount of the grid space.
Thus, the position that the dog is kicked must be at the approximate center of the grid space.
Adjustments can be made by changing the near-point dog or by setting the grid mask amount.
Setting the grid mask has the same effect as lengthening the near-point dog.
If the grid amount is near the grid space or 0, the grid point will be at the position that the
near-point dog is kicked, so set a grid mask.
The grid mask amount is set so that the grid mask is one-half of the grid space.
The grid mask amount can be set only in the reference point return direction.
The grid amount and grid space can be confirmed on the "SERVO MONITOR" screen.
Refer to the grid mask amount calculation expressions on the next page for the grid mask amount
values.
Grid mask amount calculation expression
(a) When
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CHAPTER 3 MAINTENANCE
3. Adjusting the Dog-Type Reference Point Return
Dog
Grid space
< Grid amount
2
Near-point dog
search engine
Reference point
The electrical zero point
will change depending on
the limit switch delay.
Grid mask amount = Grid amount −
Reference point
(Position returned to with the reference point
return command)
Electrical zero point
Grid mask
Grid space
Grid mask
amount
2
Grid amount
III – 7
Grid space
2