Mitsubishi Electric MELDAS 600M Series Instruction Manual page 389

3. Adjusting the Dog-Type Reference Point Return
The relative position detection and absolute position detection type position detection systems are
available. The methods of returning to the reference point include the dog-type reference point return and
the dogless-type reference point return.
The method of adjusting the dog-type reference point return using the relative position detection is
described in this section.
3.1 Dog-type reference point return
(1) Reference point return operation
When the dog-type reference point return is executed, the machine will move at the commanded
speed. When the near-point detection limit switch kicks the near-point dog (when the near-point
detection signal turns OFF), the machine decelerates to a stop. After decelerating to a stop, the
machine moves at the creep speed, and positions to the first grid point after leaving the near-point
dog.
This grid point is called the electrical zero point. Normally, this electrical zero point position is the
reference point.
For the reference point return using the relative position detector, the first return after turning the
power ON is carried out with the dog-type reference point return. The second and following returns
are carried out with high-speed reference point return. High-speed reference point return is a
function that directly positions to the reference point saved in the memory without decelerating at
the near-point dog.
If reference point return has not been executed even once after turning ON the power while using
relative position detection, the "PR0430 Return incomplete axis exists" alarm will occur when
movement commands other than G28 are executed.
G28 Rapid traverse rate
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CHAPTER 3 MAINTENANCE
3. Adjusting the Dog-Type Reference Point Return
Grid point
Grid space
Near-point detection
limit switch
Reference point return direction
search engine
(Position returned to with the reference point
return command)
Creep speed
Near-point dog
Grid amount
Electrical zero point
III – 3
Reference point