Auto-Tuning - Brainchild P41 User Manual

3 -10 Auto-tuning

3 -10 Auto-tuning
The auto-tuning process is performed at set point. The auto-tuning process is performed at set point.
The process will oscillate around the set point during tuning The process will oscillate around the set point during tuning
process. Set a set point to a lower value if overshooting beyond process. Set a set point to a lower value if overshooting beyond
the normal process value is likely to cause damage. the normal process value is likely to cause damage.
The auto-tuning is applied in cases of : The auto-tuning is applied in cases of :
Initial setup for a new process Initial setup for a new process
*
The set point is changed substantially from the previous auto- The set point is changed substantially from the previous auto-
*
tuning value tuning value
The control result is unsatisfactory The control result is unsatisfactory
*
Operation : Operation :
1. Set the correct values for the configuration page. Nonzero value
for PB and TI should be set. Set a correct password for the unit.
2. Set EIFN = PID2 if a second set of PID is required to be tuned.
3. Set the set point to a normal operating value or a lower value if
overshooting beyond the normal process value is likely to cause
damage. Then enters the A-T mode. The upper display will begin
to flash and the auto-tuning procedure for PID1 is beginning.
4. If the system needs to use a second set of PID values, then after
the first auto-tuning is complete, close the event input of the unit
and repeat the step 3 to the second set of PID values.
NOTE : NOTE :
The auto-tuning mode is disabled as soon as either failure mode
or manual control mode occurs.
Procedures:
The auto-tuning can be applied either as the process is warming
up ( Cold Start ) or as the process has been in steady state (
Warm Start ).
After the auto-tuning procedures are completed, the upper
display will cease to flash and the unit revert to PID control by
using its new PID values. The PID values obtained are stored in
the nonvolatile memory.
UM0P411A
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