West-control-solutions KS 92-1 Programmer manual Manual de usuario descargar pdf (Pagina 24)

3.7 Second PID parameter set

The process characteristic is frequently affected by various factors such as pro-

cess value, correcting variable and material differences.

To comply with these requirements, KS 90-1 can be switched over between two

parameter sets.

Parameter sets PArA and PAr.2 are provided for heating and cooling.

Dependent of configuration ( ConF/LOG/Pid.2), switch-over to the second pa

rameter set ( ConF/LOG/Pid.2) is via one of digital inputs di1, di2, di3,

key è or interface (OPTION).

Self-tuning is always done using the active parameter set, i.e. the second

parameter set must be active for optimizing.

Operation

Second PID parameter set 24 KS 90-1p / KS 92-1p

Parameter adjustment effects

Parameter Control Line-out of disturbances Start-up behaviour

Pb1 higher increased damping slower line-out slower reduction of duty cycle

lower reduced damping faster line-out faster reduction of duty cycle

td1 higher reduced damping faster response to disturbances faster reduction of duty cycle

lower increased damping slower response to disturbances slower reduction of duty cycle

ti1 higher increased damping slower line-out slower reduction of duty cycle

lower reduced damping faster line-out faster reduction of duty cycle

Formulas

K = Vmax * Tu controller behavior Pb1 [phy. units] td1 [s] ti1 [s]

With 2-point and

3-point controllers,

the cycle time must be

adjusted to

t1 / t2 £ 0,25 * Tu

PID 1,7*K 2*Tu 2*Tu

PD 0,5 * K Tu OFF

PI 2,6 * K OFF 6*Tu

PKOFF OFF

3-point-stepping 1,7 * K Tu 2 * Tu

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 83 84

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West-control-solutions KS 92-1 Programmer manual Manual de usuario Pagina 24