
9. SPINDLE SPEED FUNCTIONS
B–64112EN/01
NC FUNCTION
88
This function monitor spindle speed, detects a higher level of fluctuation
than the commanded speed and signals an abnormality, if any, to the
machine side, using an alarm, thereby preventing the spindle from
seizure, for example. Whether the spindle speed fluctuation detection is
done or not is specified by G code.
G25 : Spindle speed fluctuation detection is off.
G26 : Spindle speed fluctuation detection is on.
G26 P_ Q_ R_ ;
P_ : Time from the change of spindle speed to the start of the spindle
speed fluctuation detection (Unit: msec)
Q_ : The ratio of spindle speed to the specified spindle speed
where spindle speed fluctuation detection starts (Unit: %)
R_ : Fluctuation ratio regarded as an alarm (Unit: %)
NOTE
1 The value of P, Q, and R remains after the power off.
2 The actual spindle speed is calculated by the return pulses
generated from the position coder attached to the spindle.
There are two ways in generating an alarm:
An alarm is generated before the specified spindle speed reaches.
An alarm is generated after the specified spindle speed reaches.
9.9
SPINDLE SPEED
FLUCTUATION
DETECTION
(G25, G26)
Format
Explanations