Page 42 Accumass BW500 PL-565
Recalibration
Material Tests
Material tests are performed to verify the accuracy of the span calibration and
compensate for the belt effects to material loading. If the material tests indicate a
repeatable deviation exists, a manual span adjust (P019) is then performed. This
procedure automatically alters the span calibration and adjusts the test load (P17)
value, yielding more accurate span recalibrations.
If the span adjust value is within the accuracy requirements of the weighing system,
the material test was successful and normal operation can be resumed.
If the span adjust value is not acceptable, repeat the material test to verify
repeatability. If the result of the second material test differs considerably, consult
Milltronics or their agent.
If the span adjust values are significant and repeatable, perform a manual span
adjust:
Note:
Test weights are NOT used during material tests.
There are two methods of executing the manual span adjust: % Change and Material
Test
• % Change: based on the material test, the difference between the actual weight of
material and the weight reported by the BW500 is calculated and entered into P019
as % change.
• Material Test: based on material test, the actual weight of material is entered into
P019
The method of execution is a matter of preference or convenience, and either way
yields the same result.
% Change
• Run the belt empty.
• Perform a zero calibration.
Put the BW500 into run mode
Record the BW500 total as the start value _ _ _ _ _ _
✍
Run material at a minimum of 50% of design rate over the belt scale for a minimum of
5 minutes.
Stop the material feed and run the conveyor empty.
Record the BW500 total as the stop value _ _ _ _ _ _
✍
Subtract the start value from the stop value to determine the BW500 total
• Weigh the material sample if not already known.
BW500 total = _ _ _ _ _ _
✍
material sample weight = _ _ _ _ _ _ ✍
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