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10 The Spindle Function
68
Fig. 10.6-3
Detecting Error
In the course of detection the control sends error message in case the deviation between current and
specified spindle speed exceeds
- the tolerance limit specified by value "r" in
percent of the command value and
- also the absolute tolerance limit specified by
value "d"
When the current speed has exceeded both
tolerance limits, the NC sets flag I656 to PLC.
The speed range, in which the NC issues
alarm, can be seen on the 3rd figure. If the
specified spindle speed is under value "S"
apparent in the figure, the NC issues alarm,
provided the current speed is 0 revs/min for
more than 1 second.
– The spindle speed fluctuation detection is
effective only if the spindle is mounted
with encoder.
– The specified spindle speed, according to
which the current spindle speed is
detected is calculated by taking the
override, the revolution range limits and the programmed maximum revolution (G92 S_) in
constant surface speed calculation (G96) into account.
– The spindle speed fluctuation detection is effective only in case of G26 and rotating spindle (state
M3 or M4).
– Command G26 must be programmed in single block.