
2.EXPLANATION OF OPERATION MODES FANUC AC SPINDLE MOTOR αi series B-65280EN/05
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(b) Clutch/gear signals (CTH1A, CTH2A)
(i) These signals are used to select spindle control parameters
(position gain, gear ratio, and velocity loop gain) when there are
two or more gear change stages between the spindle and spindle
motor.
(ii) Make settings as indicated in the table below according to the
state of the clutch or gear. The names such as HIGH GEAR are
given for convenience, and the correspondence to the actual
gears is free.
CTH1A CTH2A
0 0 HIGH GEAR
0 1 MEDIUM HIGH GEAR
1 0 MEDIUM LOW GEAR
1 1 LOW GEAR
(c) Spindle orientation stop position change command (INDXA)
(i) This signal is used to change to another orientation position after
a spindle orientation operation is performed by stop position
external setting type orientation.
This signal is valid when the spindle orientation command
(ORCMA) = 1.
(ii) When this signal makes a transition from 1 to 0, the spindle is
oriented to the position (arbitrary position in one rotation:
absolute position command) specified by new stop position data
(SHA11 to 00) within one rotation.
(iii) The direction of orientation rotation is specified by the shortcut
command (NRROA) and the rotation direction command
(ROTAA).
(iv) This function is valid when the CNC parameter for the stop
position external setting type orientation function is set.
(d) Spindle orientation stop position change shortcut command (NRROA)
(i) This signal is used for shortcut (within ±180 degrees) positioning
at the next stop position when a rotation direction is specified to
change the orientation position after a spindle orientation
operation.
(ii) When this signal is set to 1, shortcut positioning is performed,
regardless of the spindle orientation stop position change rotation
direction command (ROTAA).
(e) Spindle orientation stop position change rotation direction command (ROTAA)
(i) This signal is used to specify a rotation direction when the
orientation position is successively changed to another
orientation position after a spindle orientation operation.
When this signal is set to 0, the spindle rotates CCW and stops.
When this signal is set to 1, the spindle rotates CW and stops.
(ii) This signal is valid when the spindle orientation stop position
change shortcut command (NRROA) is set to 0.