Mitsubishi Electric M700VS Series Setup Manual page 98

(Note 1) To change just the basic machine coordinate zero point, set "#0 Absolute posn set" and "#2 Zero-P", and then
turn the power OFF and ON.
(Note 2) If pressing against the machine end is attempted without passing the grip point once after turning the power
ON, the operation message "Not passed on grid" will appear. Return to a point before the last grid, and then
repeat from step of pressing against the machine end stopper.
(Note 3) If the first grid point is covered by the grid mask (#2028 grmask) as a result of return to the electric basic
position, the axis stops at the next grid point.
Note that zero-point shift amount (#2027 G28sft) is invalid.
(Note 4) Acceleration/deceleration during movement at the specified push speed is performed in smoothing-off
(stepfeed) mode.
(Note 5) If "0" is specified for "#2056 aproch" of the absolute position parameters, the machine zero point is regardedas
the approach point.
(Note 6) Automatic initialization is interrupted if one of the following events occurs. If it is interrupted, [State] indicates
"Jog Start" (after selecting the "Auto init set" mode if it is caused by mode change), so restart operation from
the step of JOG-start.
- An absolute position detection alarm occurs.
- Operation preparation signal turns OFF.
- The mode is changed.
- The system is reset.
If [State] is "Complete" before automatic initialization is started, "State" returns to "Complete" when power is
turned OFF and ON again without restarting the operation.
(Note7) Automatic initialization cannot be started in the following cases. The operation message "Can't start" will
appear if starting is attempted.
- When "#0 Absolute posn set" is not set.
- When the "#2 Zero-P" setting is inappropriate.
- When "#2055 pushf" is not set.
- When "Z71 Abs encoder failure 0005" has occurred.
In the above cases, if the "#2 Zero-P" setting is inappropriate, this means that the relation of "#2 Zero-P" and
"#2037 G53ofs" is inappropriate. That is, if "#2 Zero-P" is smaller than the "#2037 G53ofs", the machine end
stopper will be located between the basic machine coordinate system zero point and reference position; this
disables automatic initialization. (Refer to the following left figure.)
If "#2 Zero-P " is set to "0", the machine end stopper direction is unpredictable; this also disables automatic
initialization. (Refer to the following right figure.)
Basic machine coordinate
system zero point
"#2 Zero-P"
Looking from the basic machine coordinate system zero point,
the reference position is located far beyond the machine end
stopper, thus the reference position return cannot be carried out.
Reference position
Machine end stopper
(Mechanical basic
position)
#2037 "G53ofs"
M700VS Series Setup Manual
7.1 Adjusting the Absolute Position Detection System
Machine end
stopper
(Mechanical
basic position)
Basic machine coordinate
system zero point
If the "#2 Zero-P" setting is "0", the
basic machine coordinate system
zero point is located on the machine
end stopper.
The direction of axis movement is
thus unpredictable.
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