SuperNova PD500 PID Process & Temperature Controllers
Instruction Manual
44
Control Group (G.CTL)
The Control Group contains parameters to begin and
adjust auto-tuning, set manual PID parameters, and
perform basic control functions such as set value
ramp up and down behavior.
During programming of the Control Group, references
to “n” in the programming menus refers to the number
1, 2, 3, or 4; the PID group number the parameter
applies to. For example, n.PID could appear as 1.PID,
2.PID, 3.PID, and 4.PID.
Auto-Tuning Process
The auto-tuning function automatically measures,
computes the control system characteristics, and sets
the optimum proportional band (P), integral time (I),
and derivative time (D) constants.
When auto-tuning starts, the control output is
changed temporarily to ON/OFF control and the
optimum PID constants are computed and set from
system response data. The TUNE or [T] icon on the
display will blink during the auto-tune process.
When the auto-tuning process is complete, the TUNE
or [T] icon will turn off and stop blinking.
The time required for AT depends greatly on the
control system.
If the auto-tune process has not ended after 24 hours,
auto-tune process is automatically canceled, and no
PID parameters are set.
If the auto-tune process exceeds 24 hours, the control
output will generate an emergency output, the TUNE
or [T] icon will keep blinking, and AT.E will be
displayed on the PV window.
The SV used for auto-tune is either the SV of the set
value number set by parameter SV.NO, or the remote
SV if the remote SV input (REM) is selected.