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62 Micro Motion
®
Model 1500 Transmitters with the Filling and Dosing Application
Configuring the Filling and Dosing Application
7.5 Overshoot compensation
Overshoot compensation keeps the actual quantity delivered as close as possible to the fill target by
compensating for the time required to close the valve. Without overshoot compensation, there will
always be some amount of overfill because of the time required for the transmitter to observe that the
target has been reached and send the command to close the valve, and then for the control system and
valve to respond. When overshoot compensation is configured, the transmitter issues the valve close
command before the target is reached. See Figure 7-6.
Table 7-4 Valve control parameters – Two-stage discrete fill
Flow option Default Description
Open Primary 0.00% of target Enter the quantity or the percent of the target at which the primary valve will
open.
Either Open Primary or Open Secondary must be set to 0. If one of these
parameters is set to a non-zero value, the other is set to 0 automatically.
Before a fill of this type can be started, the primary valve must be assigned to
a discrete output. See Section 7.4, Step 4.
Open
Secondary
0.00% of target Enter the quantity or the percent of the target at which the secondary valve will
open.
Either Open Primary or Open Secondary must be set to 0. If one of these
parameters is set to a non-zero value, the other is set to 0 automatically.
Before a fill of this type can be started, the secondary valve must be assigned
to a discrete output. See Section 7.4, Step 4.
Close Primary 100.00% of target Enter the percent of the target, or the quantity to be subtracted from the target,
at which the primary valve will close.
(1)
Either Close Primary or Close Secondary must be set to close when the target
is reached. If one of these parameters is set to a value that is not the target,
the other is adjusted accordingly.
(1) See the definition of Configure By in Table 7-3
.
Close
Secondary
100.00% of target Enter the percent of the target, or the quantity to be subtracted from the target,
at which the secondary valve will close.
(1)
Either Close Primary or Close Secondary must be set to close when the target
is reached. If one of these parameters is set to a value that is not the target,
the other is adjusted accordinly.
Table 7-5 Valve control parameters – Three-position analog fill
Flow option Default Description
Open Full 0.00% of target Enter the quantity or the percent of the target at which the valve will transition
from partial flow to full flow.
Close Partial 100.00% of target Enter the percent of the target, or the quantity to be subtracted from the target,
at which the valve will transition from full flow to partial flow.
(1)
(1) See the definition of Configure By in Table 7-3.