Rockwell Automation 8520-ARM2 9/Series CNC AMP Reference Manual Documentation Set - Manual (Page 335)

Spindle 1 Parameters
Chapter 12
12-7
Function
Specifies the percentage by which the actual spindle speed can deviate
from the anticipated spindle speed before the control sets the PAL flag
“Spindle Speed Deviation Excessive” to “TRUE.”
Corrective action by the control is limited to setting this PAL flag.
Therefore, this parameter requires proper PAL programming to be
effective. Refer to the notes below.
Important: For this parameter to have significance (and not be ignored):
the spindle must have position feedback
the software option for spindle speed deviation detection must
be installed
Spindle Parameter
Number
1 [861]
Range
0 to 100 %
Notes
If the spindle has a feedback device, the control monitors the feedback and
determines a velocity.
The “anticipated spindle speed” mentioned under FUNCTION above is the
result of simulated feedback. The control simulates an acceleration /
deceleration ramp for the spindle based on the parameter Dev. Detection
Filter Time. The actual spindle velocity (from the spindle feedback) is
then constantly compared to this simulated feedback.
For example, assume 20% is entered for this parameter and the
commanded spindle speed (after considering spindle speed override) is
1000 rpm. As the spindle accelerates, its actual speed must remain within
20% of the speed anticipated through simulated feedback. If not, the
control advises the PAL program by setting the PAL flag “Spindle Speed
Deviation Excessive” to “TRUE.”
This flag also is set “TRUE” if the spindle speed remains below 800 rpm
or above 1200 rpm after the spindle should have reached a steady state
speed of 1000 rpm.
12.4
Spindle Deviation Tolerance