
B-63494EN/02 11.APPLYCATION OF OTHER FUNCTIONS
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11.6 SPINDLE ORIENTATION
11.6.1 Overview
The dual check safety function uses the CNC CPU and spindle DSP to
separately monitor the actual speed of the spindle (safe speed
monitoring function). When the stop status of the spindle is monitored
by the safe speed monitoring function, set the safe speed parameter to
a value including a margin appropriate for the machine instead of 0
because the actual speed cannot be assumed to be 0. Since the spindle
may rotate at a speed less than the set safe speed in this case, it is
necessary to position the spindle with a position control loop formed
at the same time.
The spindle orientation function stops the spindle at a fixed position
using the position coder mounted on the spindle. For details, refer to
the FANUC AC SPINDLE MOTOR αi series Parameter Manual or
other documents.
The spindle orientation function is optional.
11.6.2 Specifications
Orientation
The orientation command (ORCMA) can be used to stop the spindle at
a fixed position.
When the orientation command is entered while the spindle is rotating,
the spindle decelerates immediately and stops at the fixed position.
Switching to the orientation mode
When the orientation command signal ORCMA is set to 1, spindle
rotation control (method of controlling the rotation of the spindle with
the velocity command) is switched to the orientation mode.
Switching to spindle rotation control
When the orientation command signal ORCMA is set to 0, the
orientation mode is switched to the spindle rotation control mode.
As soon as the orientation command signal is set to 0, the velocity
command for spindle rotation control becomes valid and the spindle
rotates. For safety, set the forward/reverse spindle rotation commands
(SFRA/SRVA) and the velocity command to 0.