Swann AMU-II ph/Redox Operator's Manual page 66

AMU-II pH/Redox
Program List and Explanations
5.2.1.43
5.2.1.43.10
5.2.1.43.20
5.2.1.43
5.2.1.43.10
5.2.1.43.20
5.2.1.43
5.2.1.43.11
5.2.1.43.21
64
Ziegler-Nichols method for the optimization of a PID controller:
Parameters: Setpoint, P-Band, Reset time, Derivative time
Y
a
L
A
Response to maximum control output
B Tangent on the inflection point
X Time
The point of intersection of the tangent with the respective axis will
result in the parameters a and L.
Consult the manual of the control unit for connecting and program-
ming details. Choose control upwards or downwards.
If Control upwards or Control downwards is active
Control Parameters
Setpoint: User-defined process value (Measured value or flow)
P-Band: Range below (upwards control) or above (downwards con-
trol) the set-point, within the dosing intensity is reduced from 100% to
0% to reach the set-point without overshooting.
Control Parameters: if Parameters = Meas. Value
pH sensor
-3 pH to +15 pH
Setpoint:
0.00 pH to +2.00 pH
P-Band:
Control Parameters: if Parameters = Temperature
Setpoint: -25 °C to +270 °C
P-Band: 0 °C to +100 °C
B
A
X
Xp
Tn
Tv
Redox sensor
-500 mV to +1500 mV
0 mV to +200 mV
= 1.2/a
= 2L
= L/2
A-96.150.441 / 230523