Mitsubishi Electric MELDAS 600M Series Instruction Manual page 404

4.5 Procedures for the dogless-type detection; initializing with marked point
alignment method
With this method, a mark is assigned on a random point in the machine's moveable range, and the
axis is moved to the marked point manually initialize the zero point.
The marked point alignment method includes the type that uses a random marked point as the
absolute position basic point, and the type that uses the grid point near the marked point as the
absolute position basic point.
(The grid point is the hypothetical grid determined by the zero point return parameter "150004 Grspc"
setting.)
(1) Random point type
With this method, the machine is moved to the marked point manually to initialize the zero point,
regarding the marked point as the absolute position basic point.
The following parameters on the Zero point set screen must be set before carrying out zero point
initialization.
1. Select the Zero point set screen.
2. Press the Abs posn set key. (Note 1)
3. 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 2)
4. Change to the manual mode, and move to the marked point.
(Note 3)
5. Set "1" for "1 Ref position set" of the axis for which zero point
initialization is to be carried out.
6. Set the distance from the 1st reference point to the marked
point in "270002 Ref position offset".
(Note 5)
"270002 Ref position offset"
7. After the zero point has been initialized for all axes, turn the
power ON again.
8. After all axes have been returned to the zero point, output the
parameters. (Note 7)
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Set "270005 No stopper" to "1" (marked point alignment method).
Set "270008 Ref position type" to "0" (set marked point as 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.
6. "270002 Ref position offset"
1st reference point
III – 18
"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 the axis movement stops and "1" is
set for "1 Ref position set", "2" will appear
at the "Status" for that axis.
When writing to the SRAM is completed,
"∗" will appear.
5.
+
Marked point
Absolute position
basic point