
4.CONFIRMATION OF THE OPERATION START-UP PROCEDURE B-65285EN/03
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4.3.2.5 When cutting is not performed, the spindle vibrates, making
noise.
(1) The spindle vibrates only when the spindle speed has reached or is
at a particular speed level.
Check whether the spindle also vibrates when the motor is turning
by inertia. If noise is unchanged, investigate the source of
mechanical vibration. There are several methods to turn the
spindle by inertia as explained below. Because these methods
involve machine sequences, consult with the machine tool
builder.
A. Setting spindle control signal MPOF (FS16i: G73#2, FS15i:
G228#2) to 1 immediately causes the spindle to turn by
inertia.
B. Set ALSP (FS16i: bit 2 of parameter No. 4009, FS15i: bit 2
of parameter No. 3009) to 1. Then, when the power to the
CNC is turned off during spindle rotation, the spindle turns
by inertia. (On the spindle amplifier, Alarm 24 is indicated.)
(2) When noise is generated at the time the motor is stopped or at any
time
A. See Subsection 4.3.4 of this part, and check and adjust the
waveform of the spindle sensor.
B. Check that the motor part number matches its parameters.
For details, refer to Appendix A in "FANUC AC SPINDLE
MOTOR αi series Parameter Manual (B-65280EN)."
C. Adjust the velocity loop gain and so forth.
For details, refer to Chapter 1 in "FANUC AC SPINDLE
MOTOR αi series Parameter Manual (B-65280EN)."
4.3.2.6 An overshoot or hunting occurs.
Refer to Chapter 1 in "FANUC AC SPINDLE MOTOR αi series
Parameter Manual (B-65280EN)," and adjust parameters.