Configuring the Filling and Dosing Application

Table 7-4Valve 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

0.00% of target

Enter the quantity or the percent of the target at which the secondary valve will

Secondary

 

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.

 

 

 

Close

100.00% of target

Enter the percent of the target, or the quantity to be subtracted from the target,

Secondary

 

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.

(1) See the definition of Configure By in Table 7-3.

Table 7-5Valve 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.

7.5Overshoot 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.

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Micro Motion® Model 1500 Transmitters with the Filling and Dosing Application

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Emerson Process Management 1500 manual 4Valve control parameters Two-stage discrete fill, Overshoot compensation
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1500 specifications

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