Mitsubishi Electric MELDAS C6 Instruction Manual page 373

(Note 1) If the grid point is not passed even once after the power is turned ON before setting the
(Note 2) At the step 9), if the first grid point is on the grid mask ("#2028 grmask"), the axis will stop at
(Note 3) If movement does not take place in step 8), recheck the absdir direction.
(4) Common precautions for dogless-type absolute position detector
(a) Example of setting "#2 ZERO" parameter
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4. Absolute Position Detection System
4.3 Starting Up the Absolute Position Detection System
origin point, the message "NOT PASS" will appear. In this case, return one grid back, and
repeat from step 6).
the next grid point.
Note that the zero point shift ("#2027 G28sft") is invalid.
If set to 0, the axis will move only in the forward direction, and when set to 1, will move only
in the reverse direction.
For the "#2 ZERO" parameter, set the coordinate value of the absolute position origin point
(mechanical basic position or electrical basic position" looking from the basic machine
coordinate system zero point.
(Example 1) To set the zero point at 50.0mm before absolute position origin point on + end
(Example 2) To set the zero point at 400.0mm before the machine basic position or absolute
position origin point on – end.
(Example 3) To set the basic machine coordinate system zero point on the grid point,
calculate the "#2 ZERO" parameter setting value as shown below using the
value displayed at "TO END". "TO END" shows the distance from the
mechanical basic position to the previous grid point.
(Note that when setting the electrical basic position coordinate value in "#2
ZERO", the "TO END" value does not need to be considered.)
To set the third gird point as the zero point when the "TO END" display is –5.3 at
the + end basic position. (Example of 10.0mm grid interval.)
search engine
"#2 ZERO" = 50.0
Basic machine coordinate
system zero point
"#2 ZERO" = 400.0
Absolute position
origin point
"#2 ZERO" = 25.3
Basic machine coordinate
system zero point
10.0 10.0
"TO END" = –5.3
III - 24
Absolute position
origin point
Basic machine
coordinate system zero
point
Mechanical basic
position