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called the “Low Count Limit”. The IMPAX monitor can further compare the learned value to
the average value of the last sixteen (16) strokes and that is called the “Medium Count Limit”.
Lastly, the IMPAX monitor can compare the learned value to the average value of the last sixty-
four (64) strokes and that is called the “High Count Limit”. It is possible to disable the limits for
this channel by blanking out the letters SLMH. The display shows which limits are enabled, for
example “LIMITS ON S ” would mean that only the Single Hit Limit is operating.
PTG/IMPAX recommends that all four tests remain active. The Single Hit Test is the critical
test but the others are valuable in detecting tool wear. To turn them on or off, press:
0 for Single Hit Limit
1 for Low Count Limit
2 for Medium Count Limit
3 for High Count Limit
Press Enter/Yes to lock in your selection once it is made.
The display now shows “FIXED ENABLED” or “FIXED DISABLED”. This feature disables
the automatic tuning built into IMPAX and allows the operator to establish their own upper and
lower limits. This feature is typically used if you want the limits wider than those supplied with
a tolerance setting of 9 or narrower than those supplied with a tolerance setting of 1.
PTG/IMPAX recommends FIXED DISABLED except under special circumstances. Press
Next/No to select one choice or the other, then press Enter/Yes.
The next display is “FAST LIMITS OFF” or “FAST LIMITS ON”. FAST limits ‘LEARNS’ just
like a normal LEARN cycle, it just does it a lot faster. This is useful if you need faster
protection than a normal ‘LEARN’ cycle will give you.
The next display is “TREND LIM OFF” or “TREND LIM ON”. The trending function ‘off’ lets
the force limits move with long-term changes or trends in the force measurements; this reduces
the chance of detecting long-term trends such as tool wear, but eliminates false shutdowns due to
these changes. Trending ‘on’ puts a programmable limit on such changes. Press Next/No to
select your choice, then press Enter/Yes.
The next display will either be “EXCPTN LIM OFF”, “EXCPTN LIM CUMU”, or “EXCPTN
LIM CONS”. An exception count permits a certain number of parts (up to 99%, as selected in
the tolerance conversation) to be let-by; these may be above the upper limit, below the lower
limit, or both. For instance, low exceptions would be useful for passing dropped blanks in
certain heading operations. If you select “EXCPTN LIM OFF”, this feature is turned off. Make
your choice by pressing Next/No, then lock it in by pressing Enter.
If you choose CUMU or CONS, you must select between “LO EXC ONLY”, “HI EXC ONLY”
or “LO + HI EXCS” which will determine which limits are affected. Make your choice by
pressing Next/No, then lock it in by pressing Enter.
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