805.49
K-Commander Loss-in-Weight Programming
Rev: G Produced by the K-Tron Institute
Tare and Span Calibration Procedures, Continued
Span
calibration by
taking rate
samples
You can also set the weight span by taking weight samples. This is
probably not quite as accurate as the method using a known accurate
weight.
Step Action
1 Put material in the feed hopper.
2 Place the machine in Gravimetric control.
3 Put in a desired operating setpoint.
4 Run the feeder for a period until the massflow and drive
command values are stable.
5 Take 5, 1 minute catch samples in a row.
ex: 3.66 kg, 3.56 lkg, 3.58 kg, 3.60 kg and 3.59 kg
6 Add up the samples and divide by the number of samples
taken to get the average sample value.
Total = 17.99 kg and divide by 5 samples = 3.598 kg/sample.
7 Recalculate the setpoint into the same time units.
ex: Setpoint = 220 kg/hr = 3.666 kg/minute
8
Calculate the new span using the current span in the
following formula.
New Span = Current Span*(Sample Ave./ Setpoint) =
ex; Current span = 1.005
New Span = 1.005*(3.598/3.666) = 0.986
9 Enter calculate span into the variable Weight Span
10 Repeat steps 5 to 8 to check that the span is OK. If not, redo
the calculations, enter new span as in step 9, and redo steps
5-8 again.
Continued on next page
To Next Page
Loading...