TOHO ELECTRONICS TTM200 - Manual (Page 93)

48-7009-E 5-23
Re-execution of AT
PID parameters calculated by AT are not necessarily best suited for all states.
Re-execute AT because best suited control may not be possible for cases listed below where settings or
states are changed.
Changes on other than this
equipment Changes on this equipment
Sensor (changed to different
type) Setting of input type Control type setting Forward/reverse operation
setting
Output (heater or power
supply) Great change of SV PID control type Tuning type setting
Change of operation of
controlled subject SV limiter upper limit and
lower limit Type B mode Primary/secondary control
operating amount limiter
Primary/secondary control
proportional band setting Integral time setting Derivative time setting
Anti-reset windup Valve motor stroke time
■ Special operation of AT
① AT starts also when READY is set for DI, using the AT start screen or AT start/stop based on the
key function setting.
② AT continues when the control is changed from RUN to READY or vice versa, or changed from
Manual to Auto or vice versa for DI during AT.
③ The operation switches over from reverse to forward or vice versa for DI even during AT.
■ How to start/stop AT
AT can start in any state, such as control stop, temperature in rise or control in stability, as long as the
control is effective after power-on.
① Move to the setting item selection screen by prolonged pressing of the MODE key in the run
mode (power-on initial screen).
② Have the control setting mode (SET 04) displayed by pressing the ▽/△ key in the setting item
selection screen.
③ Have the AT start screen displayed by pressing the MODE key several times.
④ AT is executed by pressing the ▽/△ key. SV and AT alternately blinks on and off in the SV
screen during AT. Press the ▽/△ key to stop AT. The screen returns to the AT start screen.
⑤ The screen returns to the AT start screen when AT is complete. Upon the completion, PID
parameters are automatically set.
⑥ Prolonged pressing of the MODE key returns the mode to the operating mode.