150 23. Gap & Crash Function – Programming Manual
Note: The background noise acquisition time is 300 ms from the start cycle so it
is mandatory that the grinding wheel takes more time to reach the
workpiece.
Note: If the type of wheel, workpiece, etc. is changed it may be necessary to
reprogram the system.
23.1.2.2. CRASH control programming
The CRASH control must be intended as an ALARM signal that is given when the
grinding wheel collides against the workpiece or other devices and/or parts of the
grinder due to a malfunction or to a bad programming.
Programming procedure
1. Use to highlight the gain adjustment area and keys and to define
the sensitivity by setting the gain value approximately at the center of its range
(scroll bar of the scale in central position).
2. Simulate a few cycles and all the possible machine conditions (grinding,
workpiece loading/unloading, dressing, etc.) to identify the maximum noise
condition and adjust the sensitivity to have the noise value displayed on the
bargraph scale just below the threshold V (control triggering point).
In case the above procedure leads to the definition of a CRASH limit value with
a much lower sensitivity than in the GAP programming, to have a reliable
CRASH control it may be necessary to program the sensitivity only 10-20%
lower than for GAP control.
Scroll bar for gain value adjustment
Key
= / Key =
CRASH control LED
Bargraph
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