Micromod Micro-DCI: 53SL6000 Single Loop Controller Manual de usuario descargar pdf (Pagina 116)

escent process operating

level.

(Setpoint)

Programmer

Mode

An operating mode of the

characterizer that allows 13

time intervals to be defined

with ProG-chr parameter con-

stants K1-K13. Values en-

tered into chr parameter

constants K14-K26 are the

ramp values for each of the

time intervals.

Single

Station

Cascade

Control

A control strategy whereby

the controller response to

process changes is enhanced

by using two loops for an oth-

erwise single loop applica-

tion. The primary loop, which

calculates a deviation output

from a slower responding

process provides the input

setpoint to a secondary loop.

The secondary loop calcu-

lates a deviation output from

the primary loop setpoint in-

put and a process variable

from a faster responding

process to alter the final con-

trol element position. This in

turn affects the slower re-

sponding process and ulti-

mately the primary loop

setpoint output. Cascade

control is much tighter than

single loop control, as the sin-

gle loop would calculate a de-

viation only from a predefined

setpoint and a process vari-

able from the slower respond-

ing process. This control

strategy is implemented in the

53SL6000 controller with the

factory default settings and

by selecting cASc for the

ProG-cS-SchM parameter.

Single

Station

Override

Control

A control strategy whereby

two loops, primary and limit-

ing, operate interdependently

to control a final single ele-

ment. With this strategy, nei-

ther variable may exceed a

safe limit. The primary loop

is in control unless its output

tries to exceed the high or low

limit defined by the limiting

loop. If the high limit is ex-

ceeded, the controller will se-

lect the lower of the two

output values (low override).

If the low limit is exceeded,

the controller will select the

higher of the two output val-

ues (high override). The low

limit control strategy is imple-

mented with the factory de-

fault settings and by selecting

the L.LiM for the ProG-cS-

SchM parameter. The high

limit control strategy is imple-

mented with the factory de-

fault settings and by selecting

the h.LiM for the ProG-cS-

SchM parameter.

Switch

A symbol used in the control

scheme setpoint-deviation,

PID, and output path illustra-

tions that physically repre-

sents a control signal or

possible control scheme pa-

rameter selection choices.

Third

Order

Polynomial

Mode

An operating mode of the

characterizer that provides a

monotonically increasing in-

dexing capability to five third

order polynomial equations

that represent five adjacent

segments. Each segment

represents a defined control-

ler output. Equation selection

is specified with the ProG-

chr-K1 through K6 parame-

ters and values entered into

ProG-chr-K7 through K26 pa-

rameter constants are the co-

efficients A through D of the

five equations.

Tuning

The iterative procedure of

finding the optimal controller

PID (proportional, integral,

and derivative) values as re-

quired for the process under

control.

Twelve

Segment

Appendix A. Glossary 53SL6000 Instruction Manual

A-5

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