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corrections are made by the software. Gram weight errors that are
equal to, or less than, this number will be accepted and no error
corrections will take place. Since no equipment is perfect, we must
accept that a certain range of error is normal. To make corrections
within this range only adds an additional error due to hunting, and
broadens the error range. This parameter is adjusted automatically by
the software according to the actual conditions of the metering.
This number has been set based on our experience with the dispense
devices. If, over time, the computer finds that the number is too
large or too small, it will automatically adjust it to match the actual
conditions that exist with your equipment. These adjustments occur in
increments of 1 or 1/10 gram and occur only once every 20 cycles. A
change is made only if needed. Checking this number from time to time
will indicate the normal error range that is occurring with each
dispense device on your unit.
If you manually set this number to a very high value, you will
effectively eliminate all error correction attempts for the component.
Gradually, over several months, the software will adjust this number
back down. If you wish to defeat a component's error correction
routines permanently, you may set NC to (_NC 29999). The software
recognizes this number as special and will not change it. This high
setting eliminates error correction attempts for this component. The
component is still weighed, and retries still occur if short, but the
timing of each dispense is based only on previously learned rates and
never adjusted from new experience. A very small dispense in a high
vibration environment may actually be more consistently accurate if no
adjusting occurs.
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_PT (for augers and micro pulse devices only)
The _PT parameters will cause the first try dispense to be a
percentage of the full target weight. For example, with component 4
set to (4PT 00090), the first try will be 90 percent of the full target
amount. Retries then occur, but each will target only 50 percent of
the remaining requirement. A series of progressively shorter retries
should be expected, until the retry parameters are satisfied (RP and
RD). The _PT parameter is most effective for slow dispense devices,
like augers. When setting _PT, also set the _RP parameter to 00001.
This forces retries up to within 1 percent of target, instead of 10,
improving accuracy.
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_RP and _RD (No change required)
(_RD is set AUTOMATICALLY by the CALIBRATE routine)
These two parameters determine the dispense shortage error that is
be acceptable for each component.
_RP is the shortage expressed as a PERCENT of the target dispense
weight and _RD is the shortage expressed in GRAMS. These parameters
are used together, either one will force a "retry".
A "retry" is an additional dispense that is calculated to add the
amount of material that is short. This comes into play only when the
amount dispensed is less than expected.
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