Conair WSB - Manual (Page 60)

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 controls and prevents this.
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
small increments 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.
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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_RP and _RD (probably no need to ever change this)
(_RD is reset AUTOMATICALLY shortly after POWER ON)
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.
Retries will occur until the difference between the required
amount and the metered amount is equal to, or less than, the _RP
percent difference AND the _RD weight difference.
These numbers dictate just how close to perfect the dispense has
to be before going on. If the dispense overshoots the target, then the
process continues. These parameters only control the degree of weight
SHORTAGE that is acceptable.
The _RP parameter is important when SMALL DISPENSE requests for
color or additive are made. Large PERCENT errors are more likely to
occur when very small dispenses are requested.
The _RD parameter is important when LARGE DISPENSE requests for
color or additive are made. Large GRAM weight errors are more likely
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