Mitsubishi Electric MELDAS 600M Series Instruction Manual page 402

(2) Grid point type
After pushing against the machine end manually, the machine will move and stop at the first grid
point. With this method, the zero point is initialized at the grid point, which is used as the absolute
position basic point.
The following parameters on the Zero point set screen must be set before initializing.
1. Select the Zero point set screen.
2. Set the current limit value, the excessive error width and the
point type (parameter 1208) for pushing against the machine
end stopper. (Note 1)
3. Press the Abs posn set key. (Note 2)
4. Confirm the parameters for the axis for which zero point
initialization is to be carried out.
"270005 No stopper" = 0
"270008 Ref position type" = 1 (Note 3)
5. Set "1" for "1 Ref position set" of the axis for which zero point
initialization is to be carried out.
6. Change to the manual mode, and push against the machine
end stopper until the current limit is reached. (Note 4)
7. When the current limit is reached with step 6, the distance
from the machine end stopper to the previous grid will appear
at "Machine End".
8. Move in the direction opposite to the machine end with the
manual mode. The machine will not move in the machine
end stopper direction at this time.
9. When the first grid point is returned to, the machine will
automatically stop, and the absolute position basic point will
be memorized. (Note 5)
10. Set the distance from the 1st reference point to the absolute
position basic point in "270002 Ref position offset".
(Note 5)
"270002 Ref position offset"
11. After the zero point has been initialized for all axes, turn the
power ON again.
12. After all axes have been returned to the zero point, output the
parameters. (Note 7)
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Set "270005 No stopper" to "0" (machine end stopper method).
Set "270008 Ref position type" to "1" (set grid point as the absolute position basic point).
Operation procedure
= 1st reference point – absolute position basic point
"150008 #1_rfp"
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Basic machine
coordinate system
zero point (G53 zero point)
search engine
CHAPTER 3 MAINTENANCE
4. Absolute Position Detection
1. 2. 3. 4. 5. 6.
10.
"270002 Ref
position offset"
Grid point
1st
Absolute position
reference point
basic point
III – 16
"Status" display on Zero point set
screen
"0" will appear at "Status" for the axis for
which the zero point has not been
initialized.
When "1" is set for "1 Ref position set",
"1" will appear at the "Status" for that axis.
When the axis movement stops and the
current limit is reached, "2" will appear at
the "Status" for that axis.
When the movement stops at the grid
point and the writing to the SRAM is
completed, the "Status" will change to "∗".
8.
7. "Machine end"
+
Machine end