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Tuning
4.4.
MANUAL TUNING
If for any reason automatic tuning gives unsatisfactory results, you can tune the controller
manually. There are a number of standard methods for manual tuning. The one described here
is the Ziegler-Nichols method.
With the process at its normal running temperature:
1.
Set the Integral Time 'ti
2.
Set High Cutback and Low Cutback, 'Hcb' and 'Lcb', to 'Auto'
3.
Ignore the fact that the temperature may not settle precisely at the setpoint
4.
If the temperature is stable, reduce the proportional band 'Pb' so that the temperature just
starts to oscillate. If the temperature is already oscillating, increase the proportional band
until it just stops oscillating. Allow enough time between each adjustment for the loop to
stabilise. Make a note of the proportional band value 'B' and the period of oscillation 'T'.
5.
Set the Pb, ti, td parameter values according to the calculations given in Table 4-2.
Type of control
Proportional only
P + I control
P + I + D control
4-6
and the Derivative Time 'td' to OFF.
Proportional
band 'Pb'
2xB
2.2xB
1.7xB
Table 4-2 Tuning values
Installation and Operation Handbook
Integral time 'ti'
OFF
0.8xT
0.5xT
2208e and 2204e Controller
Derivative time
'td'
OFF
OFF
0.12xT
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Questions and answers
how do I get the output 2 to come on? Recently had to swap out the card, I believe I got all the parameters switched over but the output 2 is not kicking on and I'm getting 3FSH fault. Any advice will be greatly appreciated
To enable output 2 on a Eurotherm 2208e after swapping out the card and resolving a 3FSH fault, follow these steps:
1. Ensure the correct I/O module for output 2 is physically installed.
2. Power cycle the controller if not already done.
3. Enter configuration mode on the controller.
4. Navigate to the I/O module setup section.
5. Configure output 2 settings as required (e.g., type, function).
6. Exit configuration mode and save settings.
The output should now be enabled and functional.
This answer is automatically generated