4. Press
several times until
appears on the display.
4. Press
several times until
appears on the display.
5. Press
for at least 3 seconds. The display will begin to flash and the
auto-tuning procedure will begin.
5. Press
for at least 3 seconds. The display will begin to flash and the
auto-tuning procedure will begin.
3 -11 Auto-tuning
3 -11 Auto-tuning
The auto-tuning process is performed at set point.
The process will oscillate around the set point during the tuning process. Set a set point to a lower value if
overshooting beyond the normal process value set point is likely to cause damage.
The auto-tuning process is performed at set point.
The process will oscillate around the set point during the tuning process. Set a set point to a lower value if
overshooting beyond the normal process value set point is likely to cause damage.
The auto-tuning is applied in cases of :
Initial setup for a new process
The set point is changed substantially from the previous auto- tuning value
The control result is unsatisfactory
The auto-tuning is applied in cases of :
Initial setup for a new process
The set point is changed substantially from the previous auto- tuning value
The control result is unsatisfactory
*
*
*
Operation :
Operation :
2. Set the correct values for the setup menu of the unit. But don't use a zero value for PB and TI , otherwise, the
auto-tuning program will be disabled.. The LOCK parameter should be set at NONE.
2. Set the correct values for the setup menu of the unit. But don't use a zero value for PB and TI , otherwise, the
auto-tuning program will be disabled.. The LOCK parameter should be set at NONE.
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.
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.
NOTE :
NOTE :
The ramping function, if used, will be disabled once auto-tuning is initiated.
The ramping function, if used, will be disabled once auto-tuning is initiated.
The auto-tuning mode is disabled as soon as either failure mode or manual control mode occurs.
The auto-tuning mode is disabled as soon as either failure mode or manual control mode occurs.
1. The system has been installed normally.
1. The system has been installed normally.
26
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 ).
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 will 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 cases of :
If auto-tuning fails, an ATER message will appear on the display in cases of :
Solutions to
Solutions to
1. Try auto-tuning once again.
2. Do not change the set point value during auto-tuning procedure.
3. Do not set zero value for PB and TI.
4. Use manual tuning instead of auto-tuning. ( See section 3-12 ).
5. Touch RESET key (
or
) to reset
message.
1. Try auto-tuning once again.
2. Do not change the set point value during auto-tuning procedure.
3. Do not set zero value for PB and TI.
4. Use manual tuning instead of auto-tuning. ( See section 3-12 ).
5. Touch RESET key (
or
) to reset
message.
If PB exceeds 9000 ( 9000 PU, 900.0 °F or 500.0 °C ).
or if TI exceeds 1000 seconds.
or if set point is changed during auto-tuning procedure.
If PB exceeds 9000 ( 9000 PU, 900.0 °F or 500.0 °C ).
or if TI exceeds 1000 seconds.
or if set point is changed during auto-tuning procedure.
