West Control Solutions Pro-16 - Manual (Page 23)

Operation
9499-040-93811 / 59537-1 Page 23 of 88 Pro-16
Parameter adjustment effects
Parameter Control Stabilized of disturbances Start-up behaviour
Pb1 higher increased damping slower stabilized slower reduction of duty cycle
lower reduced damping faster stabilized 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 stabilized slower reduction of duty cycle
lower reduced damping faster stabilized faster reduction of duty cycle
Formulas
K = Vmax * Tu
With 2-point and 3-point
controllers, the cycle time must
be adjusted to
t1 / t2 ß 0,25 * Tu
controller behaviour Pb [phys. units] td [s] ti [s]
PID 1,7 * K 2 * Tu 2 * Tu
PD 0,5 * K Tu OFF
PI 2,6 * K OFF 6 * Tu
P K OFF OFF
3-point-stepping 1,7 * K Tu 2 * Tu
3.9 Second PID parameter set
The process characteristic is frequently affected by various factors such as process value,
correcting variable and material differences.
To comply with these requirements, the controller can be switched over between two
parameter sets. Parameter sets
PArA and PAr.2 are provided for heating and cooling.
Dependent of configuration, switch-over to the second parameter set
(
ConF/LOG/Pid.2) is via key è , one of digital inputs di1…di4
or interface (OPTION).
g
Self-tuning is always done using the active parameter set, i.e. the second
parameter set must be active for optimizing.