Sterlco SGBD Series Batch Gravimetric Blenders - Manual (Page 102)

BLN1-600A Chapter 7: Appendix 102 of 116
Feed Algorithm Options Screen
INITIAL TARGET PERCENT: This is the % of target that the feeder will use to calculate
the initial meter time of each batch for that feeder. After the feeder has metered initially for a
particular batch then this value is not used.
UNDER LIMIT: Allowed underfeed of target weight for that feeder. After the meter has
completed the weight is observed. If the weight is within the target by this amount then that
feeder has completed metering and the blender moves to the next ingredient. If it is not
satisfied than the blender will repeat metering until this amount is reached. The blender will
retry forever or until the operator hits on the recipe page.
OVER LIMIT: If after metering it is determined that a feeder has metered a value greater
than the target + Over Limit weight then a counter is incremented. If this counter reaches the
OVERFEED COUNT LIMIT (Advanced Alarm Options Page) then a “OVERFEED
ALARM” will occur.
DOUBLE GATE THRESHOLD: After a feeder has retried for this many retries then the
GATE CYCLE TIME is temporarily doubled until the target is reached. This is used as a
preventative measure in the case the user has set the GATE CYCLE TIME too low for that
feeder (Mechanical Options Page).
BATCHES FOR PROCESS RATE: The process rate on the Inventory Screen is the rate at
which the customer is using the blend. Since a batch blender does not have a loss in weight
hopper to measure this take-away rate then the process rate is only an estimate. This value
helps to improve that value. This is the number of batches required before calculating the
process rate. The blender must hit high level at least twice and have made this number of
batches before a rate will be calculated. The error is always +/- 1 batch. If you set this value
to “10” then that means the process rate error will be +/- 10%. If you want to improve the
error increase this value, but this will delay getting a process rate number. If set to 100 then
the error would be +/- 1%.
STANDARD VS ADVANCED ALGORITHM: The blender should be set to Standard for
most cases. However, if enabled you can meter in the first ingredient and then all other
ingredients will be recalculated based on the actual meter of the first ingredient. To do this
you will need to lower the batch size by the % you expect the first ingredient to be in error.
You must also increase the % ABOVE BATCH SIZE FOR MAX WEIGHT ALARM by the
same amount. Doing this will lower your overall throughput capability of the blender, but
will increase accuracy by about a factor of 10.