P8
SPAN ADJUST
Adjusts the test reference calibration results to improve material flowrate measurement accuracy.
% CHANGE
» Calculate the deviation between the CompuScale III Total and the actual material
weight. A positive value reduces (negative increases) the Rate displayed.
% Span Error = CompuScale III Total - Actual Material Weight x 100
Actual Material Weight
MATERIAL TEST
» Alternatively, the automatic method may be used.
Perform a material test as follows:
a) Run the belt empty, with the test reference (Test Weight, Test Chain, or ECAL) removed.
b) Select the MATERIAL TEST option, select the HOLD TOTAL or ADD TO
TOTAL option, press "ENTER" to activate the Span Adjust totalizer.
c) Feed a sample of material onto the belt, press "ENTER" to stop the Span Adjust totalizer.
d) Enter the actual material sample weight. The Span Deviation % is displayed.
e) Press "Enter" to complete, (or "CLEAR" to abort), the procedure.
Span adjust calibrations are improved with larger material samples. Run at the normal load and speed; which
should exceed 50% of the design Rate (P1).
A Span Adjust, utilizing either method, alters the span count of the Multispan number (P26) selected, and the
Test Reference (P7) value of the Test Reference selected (P20). Copy the altered P7 value to the
Programming Chart.
enter:
0 = Span Adjust not required (F)
1 = manual, (enter current deviation in percent)
2 = automatic, (enter the material test results)
P9
FACTORING
Adjusts the Test Reference value (P7) of the Test Reference selected (P20).
After the CompuScale III is calibrated utilizing a known Test Reference (e.g.Test Chain), the load represented
by an unknown Test Reference (e.g. Test Weight(s) not supplied by Milltronics), may be established. This
feature may also be used if Span calibrations performed with one Test Reference, tend to consistently provide
greater accuracy than Span calibrations with another Test Reference.
Factoring is not required after a Span Adjust (P8), as all Test Reference values associated with the Multispan
Number (P26) selected, are automatically factored by the CompuScale III.
After performing a Span calibration utilizing the known Test Reference (P20):
a)
With the belt stopped, apply the unknown Test Reference.
b)
Select the Test Reference to be adjusted (P20).
c)
Run the empty belt at normal speed
d)
press "1","ENTER" and wait for the Calibration Duration (P30 - Belt Revolutions). When complete,
e)
copy the adjusted Test Reference (P7) value displayed, to the PROGRAMMING CHART.
If [ZERO CALIBRATION REQUIRED] is displayed, perform a Zero calibration prior to
re- attempting the factoring procedure. If a Zero calibration has been
performed recently, press "CLEAR","ENTER", and proceed.
enter:
0 = Factoring not required (F)
1 = Factoring required (with belt running empty, and selected Test Reference applied)
PL-367
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