88
A-96.250.631 / 280219
AMI Codes-II TC
Program List and Explanations
Parameter Calc. dichloramine
5.2.1.40.12
Range low
: 0–20 ppm or 0–20 mg/l
5.2.1.40.22
Range high:
0–20 ppm or 0–20 mg/l
Parameter Temperature
5.2.1.40.13
Range low
: -30 to +120 °C
5.2.1.40.23
Range high
: -30 to +120 °C
Parameter Sample flow
5.2.1.40.14
Range low
: 0 –600 B/s
5.2.1.40.24
Range high
: 0 –600 B/s
Parameter pH
5.2.1.40.15
Range low
: 0 –14 pH
5.2.1.40.25
Range high
: 0 –14 pH
As control out-
put
Signal outputs can be used for driving control units. We distinguish
different kinds of controls:
P-controller:
The controller action is proportional to the devia-
tion from the setpoint. The controller is characterized by the
P-Band. In the steady-state, the setpoint will never be
reached. The deviation is called steady-state error.
Parameters: setpoint, P-Band
PI-controller:
The combination of a P-controller with an
I-controller will minimize the steady-state error. If the reset
time is set to zero, the I-controller is switched off.
Parameters: setpoint, P-Band, reset time.
PD-controller:
The combination of a P-controller with a
D-controller will minimize the response time to a fast change
of the process value. If the derivative time is set to zero, the
D-controller is switched off.
Parameters: setpoint, P-Band, derivative time.
PID-controller:
The combination of a P-, an I - and a D-con-
troller allows a proper control of the process.
Parameters: setpoint, P-Band, reset time, derivative time.
Ziegler-Nichols method for the optimization of a PID controller:
Parameters
: Setpoint, P-Band, Reset time, Derivative time
