Table of Contents
Advertisement
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 AT indicator
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.
Auto-Tuning Error
Auto-Tuning Error
If auto-tuning fails an ATER message will appear on the display in
If auto-tuning fails an ATER message will appear on the display in
cases of :
cases of :
If PB exceeds 9000 ( 9000 PU, 900.0 F or 500.0 C ).
If PB exceeds 9000 ( 9000 PU, 900.0 F or 500.0 C ).
or if TI exceeds 1000 seconds.
or if TI exceeds 1000 seconds.
or if set point is changed during auto-tuning procedure.
or if set point is changed during auto-tuning procedure.
Solutions to
Solutions to
1. Try auto-tuning once again.
1. Try auto-tuning once again.
2. Don't change set point value during auto-tuning procedure.
2. Don't change set point value during auto-tuning procedure.
3. Don't set zero value for PB and TI.
3. Don't set zero value for PB and TI.
4. Use manual tuning instead of auto-tuning. ( See section 3-12 ).
4. Use manual tuning instead of auto-tuning. ( See section 3-12 ).
5. Touch RESET key to reset
5. Touch RESET key to reset
3 - 12 Manual Tuning
3 - 12 Manual Tuning
In certain applications ( very few ) using auto-tuning to tune a process
may be inadequate for the control requirement, then you can try
manual tuning.
If the control performance by using auto- tuning is still unsatisfactory,
the following rules can be applied for further adjustment of PID values :
47
L
L
message.
message.
UM0C911A
L
L
Hide quick links:
Advertisement
Table of Contents
