Valve Control Parameters - Emerson MICRO MOTION 1500 Configuration And User Manual

Configuring the Filling and Dosing Application
Table 7-3 Filling control options continued
Control option Default
Purge Time 1.00000 sec
AOC Algorithm Underfill
AOC Window 10
Length
Fixed Overshoot 0.00000
Comp
7.4.3

Valve control parameters

The valve control parameters are used to open and close the valves at particular points in the fill
process.
• Valve control parameters for two-stage discrete filling are listed and defined in Table 7-4.
• Valve control parameters for three-position analog filling are listed and defined in Table 7-5.
Note: Valve control parameters are not used for one-stage discrete filling. In one-stage discrete filling,
the valve opens when the fill is started, and closes when the fill target is reached.
Configuration and Use Manual
Description
Used only if Purge Mode is set to Auto.
Enter the purge duration, in seconds. When Purge Time has elapsed, the purge
(secondary) valve will be closed automatically.
Select the type of overshoot compensation to be performed:
• Underfill – The actual quantity delivered will never exceed the target quantity.
• Overfill – The actual quantity delivered will never be less than the target
quantity.
• Fixed – The valve will close at the point defined by the target quantity minus
the Fixed Overshoot Comp parameter.
Underfill and Overfill are available only if AOC is enabled.
Fixed is available only if AOC is disabled.
For standard AOC calibration, specify the maximum number of fills that will be
run during calibration.
For rolling AOC calibration, specify the number of fills that will be used to
calculate AOC.
Used only if AOC is disabled and AOC Algorithm is set to Fixed.
Enter the value to be subtracted from the target quantity to determine the point
at which the valve will close. Enter the value in mass or volume units, as
appropriate to the configured flow source.
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