Tuning Your Oven; Tuning Error; Gain Scheduling - Thermo Scientific 3490M Manual

Section 6
Programmable Models

Tuning Your Oven

Tuning Error

Gain Scheduling

6-14 Clean Room Oven
The purpose of tuning your oven is to match the characteristics of your
controller to the characteristics of the process being controlled. Good
control is evidenced by: stable, straight-line control of the setpoint
temperature with no fluctuations; No overshoot or undershoot of the
setpoint temperature; rapid restoration of the setpoint temperature when
external disturbances cause deviations from the setpoint.
This controller has automatic tuning features which install optimum
tuning parameters to give the best temperature accuracy. No manual
loading of tuning parameters is needed. We recommend that you tune the
oven to your specific application to obtain the best results. To provide the
best temperature accuracy possible, use these features when you install your
oven and whenever you change your application or procedure.
Note Display will flash "tu.ER" if an error occurs during tuning. To clear
the error and restart tuning, simultaneously press the PAGE and SCROLL
buttons and follow the steps outlined in "Autotuning."
Note To stop the tuning function, simultaneously press the PAGE and
SCROLL buttons. ▲
The display will flash "tu.ER" if an error occurs during tuning. To clear the
error and restart tuning, simultaneously press the PAGE and SCROLL
buttons and follow the steps outlined in "Autotuning."
G.SP: Gain Scheduling
Gain scheduling is the automatic transfer of control between two sets of
PID values. The 2416 controller does this at a presettable process value.
Gain scheduling is used for difficult control processes which show large
changes in their response time or sensitivity at high or low temperatures, or
when heating or cooling.
The G.SP gain schedule setpoint is factory set at 700°C. The G.SP must be
adjusted to 200°C from the desired setpoint temperature when tuning.
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