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Determining PID Constants (AT, ST, Manual Setup) Section 3-8

■ 100% AT

Operation will be as shown in the following diagram, regardless of the devia-

tion (DV) at the start of AT execution. To shorten the AT execution time, select

100% AT.

Note The Limit Cycle MV Amplitude parameter is disabled.

Operating Procedure This procedure executes 40%AT.

3-8-2 ST (Self-tuning)

ST (self-tuning) is a function that finds PID constants by using step response

tuning (SRT) when Controller operation begins or when the set point is

changed.

Once the PID constants have been calculated, ST is not executed when the

next control operation is started as long as the set point remains unchanged.

ST (self-tuning) is enabled when the ST parameter is set to ON in the initial

setting level.

When the ST function is in operation, be sure to turn the power supply of the

load connected to the control output ON simultaneously with or before starting

Controller operation.

When executing self-tuning, turn ON power for the load (e.g., heater) at the

same time as or before supplying power to the Digital Temperature Controller.

If power is turned ON for the Digital Temperature Controller before turning ON

power for the load, self-tuning will not be performed properly and optimum

control will not be achieved.

AT started AT ended

Time

Limit Cycle MV

Amplitude 100%

Adjustment Level

1. Press the O Key to move from the operation level to the adjustment level.

2. Press the U Key to select at-1. The No. 1 display for AT Execute/Cancel

will flash during AT execution.

3. off will be displayed when AT ends.

Operation Level

4. To return to the operation level, press the O Key.

off

AT Execute/

Cancel

at-1

off

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