Mitsubishi Electric MELDAS 600M Series Instruction Manual page 401

4.4 Procedures for the dogless-type detection; initializing with machine end
stopper method
Initialization is carried out by pushing against the machine end manually.
The stopper method includes the type that uses the machine end as the absolute position basic point,
and the type that uses the grid point near the machine end 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 (machine end) point type
With this method, the zero point initialization is carried out by pushing against the machine end
manually. The machine end 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 270008) 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" = 0 (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. Set the distance from the 1st reference point to the machine
end stopper in "270002 Ref position offset". (Note 5)
"270002 Ref position offset" =
8. After the zero point has been initialized for all axes, turn the
power ON again.
9. 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 "0" (set machine end as absolute position basic points).
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)
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CHAPTER 3 MAINTENANCE
4. Absolute Position Detection
1. 2. 3. 4. 5.
7. "270002 Ref position offset"
Grid
1st reference point
III – 15
"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 writing to the SRAM is completed,
"∗" will appear.
6.
+
Machine end
Absolute position basic point