Fanuc Series 15i/150i-MA (Programming) Operators Manual

9.SPINDLE SPEED FUNCTION (S FUNCTION) PROGRAMMING B-63324EN/03
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9.4 SPINDLE SPEED FLUCTUATION DETECTION (G26, G25)
General
If the actual spindle speed becomes lower or higher than that specified
because of the condition of the machine, an overheat alarm (SP0242) is
issued, and spindle speed fluctuation detection alarm signal SPAL is
output. This signal can be used to prevent the guide bushing from
burning out.
Format
- Enabling of spindle speed fluctuation detection
G26 P_ Q_ R_ I_ ;
P : Time from the point a new spindle rotation command (S
command) is supplied or the G26 command is issued
until spindle speed fluctuation detection is actually
started.
Units: msec
If the specified speed is reached within time P, spindle
speed fluctuation detection starts at that point.
Q: Permissible error assumed to determine whether the
specified speed is reached
Units: 1.0% if FLR (bit 1 of parameter No. 5808) is equal
to 0; and
0.1% if FLR (bit 1 of parameter No. 5808) is
equal to 1.
If the speed falls within the range of the specified spindle
speed +/- the permissible error, the specified spindle
speed is assumed to have been reached, and spindle
speed fluctuation detection starts.
R: Spindle speed fluctuation that does not cause a spindle
speed fluctuation detection alarm to be issued
Units: 1.0% if FLR (bit 1 of parameter No. 5808) is equal
to 0; and
0.1% if FLR (bit 1 of parameter No. 5808) is
equal to 1.
I: Permissible spindle speed fluctuation width that does not
cause a spindle speed fluctuation detection alarm to be
issued
Units: min
-1
G26 places the system in spindle speed fluctuation detection enabled
mode and sets the P, Q, R, and I command addresses in parameters Nos.
5071, 5702, 5721, and 5722. The parameter numbers corresponding to
the command addresses are as follows:

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