United Security Products AVD-45c Manual descargar pdf (Pagina 99)

1/03 UDC 6300 Process Controller Product Manual 85

4.6 Algorithm Data Set Up Group, Continued

Table 4-5 Algorithm Group Definitions, continued

Lower Display

Prompt

Upper Display

Range of Setting

or Selection

Parameter

Definition

PID LOOPS

1 LOOP

2LOOPS

CASCADE

PID LOOPS - This is the PID loop selection.

1 LOOP - select to use one loop of control.

2LOOPS - Select to use two PID loops of control, each

with two sets of tuning parameters and a set of control

parameters.

CASCADE - Select for Cascade Control. Cascade

control is a control system where the output of one PID

loop is used to adjust the setpoint of the second

control loop and the second loop’s output actually

adjusts the final control element.

ATTENTION

To enable a cascade loop, press the

RSP/CAS

key. The CAS annunciator will light to

indicate cascade mode. Press again to disable .

CONT2 ALG

The CONTROL 2 ALGORITHM lets you select the

type of control for Loop 2 that is best for your process.

Only available if the controller is configured for

Cascade or 2Loop.

3PStep and On/Off not available for the second control

loop.

PID A

NOTE: PID A should not

be used for

Proportional only action.

i.e. no integral (reset)

action. Instead, use

PD+MR with rate set to

PID A is normally used for three-mode control. This

means that the output can be adjusted somewhere

between 100% and 0%. It applies all three control

actions — Proportional (P), Integral (I), and Derivative

(D) — to the error signal.

Proportional (Gain)

— regulates the controller’s output

in proportion to the error signal (the difference between

Process Variable and Setpoint).

Integral (Reset

) -- regulates the controller's output to

the size of the error and the time the error has existed.

(The amount of corrective action depends on the value

of proportional Gain.)

Derivative (Rate)

-- regulates the controller's output in

proportion to the rate of change of the error. (The

amount of corrective action depends on the value of

proportional Gain.)

PID B

PID B Unlike the PID-A equation, the controller gives

only an integral response to a setpoint change, with no

effect on the output due to the gain or rate action, and

it gives full response to PV changes. Otherwise

controller action is as described for the PID-A

equation. See note on PID-A.

Table 4-5 continued on next page

1 2 ... 94 95 96 97 98 99 100 101 102 103 104 ... 301 302

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