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(d) Proximity switch orientation
Proximity switch orientation enables the spindle positioning by providing the proximity switch position
installed on the spindle side as the spindle position zero point.
When the spindle motor and the spindle are connected with V-belt, the spindle position zero point
calculated from the spindle motor position varies due to belt slipping, etc. Thus, the spindle position zero
point must be detected from the proximity switch signal every time orientation or zero point return is
carried out.
In the conventional spindle position zero point detection method, the spindle position zero point is
calculated from the spindle drive unit and transmitted to NC when the position detector detects the one-
time rotation signal (Z-phase) for the first time after the system has been turned ON, and the zero point
will not be changed thereafter.
In the case of proximity switch signal orientation, NC updates the spindle position zero point every time
orientation or zero point return is carried out.
8.1.7 Spindle Position Control (Spindle/C Axis Control)
M720VW
M system
△
L system
△
This function enables one spindle drive unit to be used also as the C axis (rotary axis) using an external
signal.
The C axis servo ON signal is used to switch between the spindle and C axis.
Servo ON
At servo OFF: ---------- Spindle (C axis cannot be controlled).
At servo ON: ----------- C axis (spindle cannot be controlled).
-
Reference position return state
Reference position return is incomplete when the Z phase has not been passed.
Reference position return is complete when the Z phase has been passed.
-
C axis potion data
The NC's internal C axis position data is updated even for the spindle rotation during spindle control.
The C axis coordinate position counter is held during spindle control, and is updated according to the
amount moved during spindle control when the C axis servo READY is turned ON. (The C axis position
at servo ON may differ from the position just before the previous servo OFF.)
M730VW
M750VW
△
△
△
△
Spindle
C axis
M700V Series Specifications Manual
8 Spindle, Tool and Miscellaneous Functions
M720VS
M730VS
M750VS
△
△
△
△
Spindle
△
△
III - 107
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