Model 574 Programmable Counting System (PCS)
70 - GSE Scale Systems
press <SAMPLE>. The 574 will then perform an auto-
tare resulting in a zero net weight. The display will then
prompt you to Take: xx where the "xx" is the sample
quantity of parts (sample size) set by parameter P182.
Proceed to remove the requested number of parts. The
weight of the requested number of parts is then added by
the 574. Press the <ENTER> key. If the sample's total
weight was sufficient, the piece weight will be calculated
and the sample quantity will be displayed. Otherwise,
you may be prompted to Take additional parts. The exact
prompts will depend on whether the auto-enhance and/or
minimum accuracy assurance features have been
enabled. The minimum amount of weight required for
the sample routine to meet the selected accuracy
requirements for the specified scale capacity is
considered. Continue to enhance, as desired. Key in the
tare weight of the empty container, add the parts
removed for sampling back into the container. The
quantity displayed will be the total quantity in the
container.
If the weight of the sample removed is un-detectable or
barely detectable then the message Code 32 ADD
MORE! is displayed briefly. This actually means
“Take” if a negative sampling is to be performed. The
574 does not know if the operator intends to perform a
positive or a negative sampling if no weight is removed.
This prompt indicates that more weight must be
removed adding to the overall sample weight. This will
most often occur when the <ENTER> key is pressed
without taking out any parts. If the parts were in fact
taken from the scale, either the parts are too light to
count on that capacity platform or a much larger quantity
of parts must be hand counted out in order to perform the
sample.
USE OF THE AUTO-ENHANCE FEATURE
(Parameter 181)
When the auto-enhance feature is enabled, after a sample
operation is performed, the 574 calculates the number of
parts which may be added to the scale while keeping the
574's uncertainty of the number of parts on the platform
within +/- 1/3 of a part. If the total number of parts
which may be counted without error is more than the
number sampled, the 574 will briefly display the
maximum number of parts which can be used to perform
an auto-enhance. If additional parts are added, while
keeping the total displayed quantity less than or equal
to the displayed maximum enhance amount, as soon as
motion ceases the 574 will re-calculate automatically the
piece weight based on the new larger quantity. Then the
574 will display the new maximum enhanceable quantity
and the process will repeat. However the 574 has a
minimum threshhold of the piece weight for which
enhancements can occur. This minimum enhanceable
piece weight is 0.0084% of capacity. If the piece weight
is less than this amount then enhancements are not
possible and the message Can't Enhnc will be
displayed.
Whenever a piece weight is keyed in, the 574 will clear
it's calculated accuracy register and the last sample
register since neither the accuracy nor the sampled
quantity of the entered piece weight are known.
Therefore, auto-enhancements are not possible with
entered piece weights.
USING THE MINIMUM ACCURACY
ASSURANCE FEATURE
(Parameter 183)
The minimum accuracy feature is designed to insure that
parts counting operations will result in a pre-specified
minimum accuracy. This is accomplished either by
requiring the sampled parts to meet or exceed a minimum
weight, or when the enhance feature is enabled, by
requiring additional enhancements after the initial sample
operation has been performed before a large number of
parts may be counted. In the case of the enhance feature
being disabled, if the weight of the sampled parts is
insufficient to guarantee the required accuracy (as set by
P183) then the operator will be prompted to Add xx
parts. The specific number represented by the "xx" is the
additional number of parts which are need to be hand-
counted and added to the scale in order for the accuracy
to be achieved.
However, if the enhance feature has
been enabled, the
possible results of a sampling operation can be detailed
as follows:
ACHIEVED ACCURACY IS LESS THAN
REQUIRED:
Achieved accuracy is insufficient to allow an
enhancement to occur with at least 5 additional pieces:
The 574 will prompt the operator with Add xx parts,
where the quantity "xx" is the number of additional parts
required to allow either enhancements to be achieved, or
the number required to achieve the required accuracy,
whichever is less. Add the specified number of parts and
then press <ENTER> or add even more parts and key in
the TOTAL number of parts on the scale and press
<ENTER>.
The 574 will display the current quantity on the numeric
display and the message Enhn# xx will be shown on the
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