Parameter Optimisation For Pid Controller; Setting Rules For Pid Controllers According To Chien/Hrones/Reswick - Ecolab MULTRONIC Notice Technique
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8.6.6
Parameter optimisation for PID controller
The response characteristic for a rapid change of the control variable y shows whether a PID
controller can be employed for the specific controlled system.
Control behaviour
Small to medium overshoot around the set point
Long rise time, control with enduring negative control deviation
Constant residual oscillation around the set point and long rise time
Constant residual oscillation around the set point and short rise time
Long rise time, small residual oscillations, oscillations in the rise phase
Medium to large overshoots
8.6.7
Setting rules for PID controllers according to Chien/Hrones/Reswick
These rules apply to PID control processes, in particular to closed loops.
The system parameters X
experimentally through a rapid change of the control variable.
They are
Amplification Δy/Δx of the controlled system (see graphs chapter 8.6.6)
X
:
s
T
:
Dead time of the controlled system
u
T
:
Rise time of the turning-tangent to the step response from the output level to the end
g
level
417101163_Multronic.doc
, T
and T
for a controlled system may have to be determined
s
g
u
- 69 -
Well controllable
Just controllable
Difficult to control
Meaning
Xp too small
Xp too large
T
too large
v
T
to small
v
T
too large
n
T
too small
n
T
1
〈
u
T
10
g
T
1
≈
u
T
6
g
T
1
〉
u
T
3
g
Countermeasure
Increase Xp
Reduce Xp
Reduce T
v
Increase T
v
Reduce T
n
Increase T
n
Rev: 5.07-08
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