Toho-electronics TTM200 Bedienungsanleitung PDF herunterladen (Seite 95)

48-7009-E 5-25

5.4.2 Self-tuning function

■ What the self-tuning is

• Self-tuning is defined as a function that automatically executes tuning without requiring operator to

provide instructions and corrects the PID constant at the time of operation start (including power-on),

change of setting value or generation of hunting.

• Ensure to execute the self-tuning in a controllable state after the input 1 terminal and output

terminals (such as the power supply for heater) are wired, and the setting temperature (SV) is set.

• Use the self-tuning function when automatic setting of PID parameters are desired after selecting the

PID control {forward operation (cooling)/reverse operation (heating)}, heating cooling PID control

and position proportional control for the control type setting.

• The values are recorded for automatically-set PID parameters for which self-tuning is complete even

when the power turns off.

PID parameters, however, does not change in case that the power turns off during self-tuning.

 Tuning using step response

Self-tuning that uses the step response method starts if the following conditions are met at the time of

starting operation (including power-on) or changing the setting values.

1) Tuning has not been executed for the present setting values. (Tuning was executed for the

previous values.)

2) Deviation > proportional band × 1.25

Available range of step response

Start

temperature

Setting

value

Elapsed time

Temperature

Proportional

band * 1.25

 Tuning due to hunting

Auto-tuning starts when the following conditions are met for hunting generated after the setting values

are reached.

1) Where the range of hunting is greater than the value of [AT sensitivity]/2 and the hunting does not

terminate

AT sensi-

tivity/2

Range of hunting

Setting

value

Elapsed time

Temperature

AT sensi-

tivity/2

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Toho-electronics TTM200 Bedienungsanleitung Seite 95