West-control-solutions KS 92-1 Programmer manual Manual de usuario descargar pdf (Pagina 22)

3.5.11 Examples for self-tuning attempts

(controller inverse, heating or heating/cooling)

Start: heating power switched on

Heating power Y is switched off (1).

When the change of process value X

was constant during one minute (2),

the power is switched on (3).

At the reversal point, the self-tuning at

tempt is finished and the new parameter

are used for controlling to set-point W.

Start: heating power switched off

The controller waits 1,5 minutes (1).

Heating power Y is switched on (2).

At the reversal point, the self-tuning

attempt is finished and control to the

set-point is using the new parameters.

Self-tuning at the set-point a

The process is controlled to the

set-point. With the control deviation

constant during a defined time (1)

(i.e. constant separation of process value

and set-point), the controller outputs a

reduced correcting variable pulse (max.

20%) (2). After determination of the

control parameters using the process

characteristic (3), control is started us-

ing the new parameters (4).

Three-point controller a

The parameter for heating and cooling are

determined in two attempts. The heating

power is switched on (1). Heating param

eters Pb1, ti1, td1 and t1 are deter

mined at the reversal point. Control to the

set-point occurs(2). With constant control

deviation, the controller provides a cooling

correcting variable pulse (3). After deter

mining its cooling parameters Pb2, ti2,

td2 and t2 (4) from the process char

acteristics , control operation is started us

ing the new parameters (5).

During phase 3, heating and cooling are done simultaneously!

Operation

Self-tuning 22 KS 90-1p / KS 92-1p

100%

Start r

t reversal point

blinks

100%

start r

t reversal point

blinks

100%

blinks

Start r

+100%

Y0%

-100%

t reversal

point

Start r

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 83 84

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