Mitsubishi Electric MELDAS 600M Series Instruction Manual page 343

CHAPTER 2 MACHINE OPERATIONS
4. Operation Mode
4.4 Reference point return mode
This mode enables a given controlled axis to be manually returned to a determined position unique
to the machine (reference point).
The first reference point return after the NC power is turned ON is carried out in the dog mode. In
the second or later reference point return, the dog mode or high speed return can be selected by
setting a given parameter.
Patterns of reference point return are shown below.
Return direction : plus
Return direction : minus
Dog Dog
Reference point Reference point
Dog mode reference point return
The following type of reference point return operation will take place during the first reference point
return after the power is turned ON or when dog-type is selected with the parameters.
(1) The controlled axis is moved in the direction where the near point detection limit switch and dog
approach each other in the reference point return mode.
(2) When the limit switch kicks the dog, the controlled axis carries out a deceleration stop.
(3) Next, the controlled axis moves to the reference point at the approach rate set in the parameter.
(4) When it arrives at the reference point, the reference point arrival signal is output.
High speed return to reference point
If high speed return is set in a given parameter after dog mode return to reference point is executed,
then high speed return to reference point will be made.
When using the absolute position detection method, the high-speed reference point return will
always be carried out.
If the return direction is erroneous in high speed reference point return, an alarm occurs.
A return reference point at the rapid traverse feedrate.
−
+
Dog
Reference point
II – 10
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