21-0* Extended CL autotuning
The extended PID closed-loop PID controllers (
parameter group 21-**, Ext. Closed-loop
) can each be auto-tuned,
simplifying and saving time during commissioning, while ensuring accurate PID control adjustment.
To use PID autotuning, it is necessary for the relevant extended PID controller to have been configured for the
application.
A graphical Local Control Panel (keypad) must be used in order to react on messages during the autotuning
sequence.
Enabling autotuning par.21-09
PID Autotuning puts the relevant PID controller into PID autotuning mode. The
keypad then directs the user with on-screen instructions.
PID autotuning functions by introducing step changes and then monitoring the feedback. From the feedback
response, the required values for PID Proportional Gain, par.21-21
Ext. 1 Proportional Gain for EXT CL 1, par.
21-41
Ext. 2 Proportional Gain for EXT CL 2 and par.21-61 Ext. 3 Proportional Gain for EXT CL 3 and Integral
Time, par.21-22
Ext. 1 Integral Time for EXT CL 1, par.21-42 Ext. 2 Integral Time for EXT CL 2 and par.21-62 Ext.
3 Integral Time for EXT CL 3 are calculated. PID Differentiation Time, par.21-23 Ext. 1 Differentation Time for
EXT CL 1, par.21-43
Ext. 2 Differentation Time for EXT CL 2 and par.21-63 Ext. 3 Differentation Time for EXT CL
3 are set to value 0 (zero). Normal / Inverse, par.21-20
Ext. 1 Normal/Inverse Control for EXT CL 1, par.21-40 Ext.
2 Normal/Inverse Control for EXT CL 2 and par.21-60 Ext. 3 Normal/Inverse Control for EXT CL 3 are determined
during the tuning process.
These calculated values are presented on the keypad and the user can decide whether to accept or reject them.
Once accepted, the values are written to the relevant parameters and PID autotuning mode is disabled in par.
21-09
PID Autotuning. Depending on the system being controlled the time required to carry out PID autotuning
could be several minutes.
Excessive feedback sensor noise should be removed using the input filter (parameter groups 6-** and 5-5*,
Terminal 53/54 Filter Time Constant/Pulse Filter Time Constant #29/33) before activating PID autotuning.
21-00 Closed-loop Type
Option: Function:
This parameter defines the application response. The default mode
should be sufficient for most applications. If the relative application
speed is known, it can be selected here. This will decrease the time nee-
ded for carrying out PID autotuning. The setting has no impact on the
value of the tuned parameters and is used only for the PID autotuning
sequence.
[0] * Auto
[1] Fast Pressure
[2] Slow Pressure
[3] Fast Temperature
[4] Slow Temperature
4-170 TR200 Programming Guide
To Next Page
Loading...
