Filter
Top Products
Configuration and Use Manual 63
Configuring the Filling and Dosing Application
Optional Configuration Using the FillerFiller ConfigurationUsing the Transmitter
Figure 7-6 Overshoot compensation and flow
Three types of overshoot compensation can be configured:
• Fixed – The valve will close at the point defined by the target minus the quantity specified in
Fixed Overshoot Comp.
• Underfill – The valve will close at the point defined by the AOC coefficient calculated during
AOC calibration, adjusted to ensure that the actual quantity delivered never exceeds the target.
(The initial adjusted target is less than the actual target, and moves upward toward the target
during calibration.)
• Overfill – The valve will close at the point defined by the AOC coefficient calculated during
AOC calibration, adjusted to ensure that the actual quantity delivered is never less than the
target. (The variance of the fills is added to the AOC-adjusted target.)
AOC calibration is required only if Underfill or Overfill is configured. There are two forms of AOC
calibration:
• Standard – Several fills are run during a special “calibration period.” The AOC coefficient is
calculated from data collected from these fills. See Section 7.5.2 for instructions on the
standard AOC calibration procedure.
• Rolling – The AOC coefficient is calculated from data collected from the x most recent fills,
where x is the value specified for
AOC Window Length. There is no special calibration period.
For example, if
AOC Window Length is set to 10, the first AOC coefficient is calculated from
the first ten fills. When the eleventh fill is run, the AOC coefficient is recalculated, based on
the ten most recent fills, and so on. No special calibration procedure is required.
Valve closes
Transmitter issues
Close valve command
Target
reached
Overfill
Valve closesTransmitter issues
Close valve command
Target
Compensation
factor
No overshoot compensation
Overshoot compensation
Flow
Flow