
9.SPINDLE FUNCTION B-63783EN-1/01
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9.10 SPINDLE OUTPUT SWITCHING
General
Spindle output switching switches between the two windings, one for
low speed and the other for high speed, incorporated into the special
spindle motors.
This ensures that the spindle motor demonstrates stable output
characteristics over a wide range.
Since spindle output switching is a function of the spindle control unit,
see also the manual for the spindle control unit being used.
This section describes the relationship between spindle output
switching and the spindle control function in the CNC.
Operation of output-switchable spindle motor
To switch the spindle output characteristics, the windings are usually
switched using a relay. Prior to the completion of winding switching,
the spindle rotates free from drive.
Output switching changes the relationship between a speed command,
issued from the CNC to the spindle, and the output characteristics of
the spindle motor.
However, the relationship between the speed command and spindle
motor speed is not changed.
Output switching timing
During actual machining, the spindle is usually controlled in the
following
way.
(1) Constant spindle speed during cutting, such as milling
(2) Continuously changing spindle speed during cutting, such as in
constant surface speed control
(3) Controlling the position loop including the spindle motor during
rigid tapping, spindle positioning, Cs contour control, etc.
For applications such as those in (1), we recommend switching the
output characteristics for low speed and high speed by using the
spindle motor speed detection signal of the spindle control unit.
For applications such as those described in (2) and (3), the spindle shall
not rotate with no drive applied during cutting or positioning. It is
necessary for the output characteristics to be switched appropriately
before machining or for output switching to be masked by using a PMC
ladder sequence.
Reference item
9.2 Spindle serial output/analog outputConnection Manual
(This manual)
9.3 Spindle control
FANCU SERVO AMPLIFIER αi series
Descriptions
B-65282EN
FANCU AC SPINDLE MOTOR αi series
Parameter Manual
B-65280EN