Omron E5*C Series User Manual

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4 Basic Operation
E5@C-T Digital Temperature Controllers User’s Manual (H185)
4-9 Determining PID Constants (Autotuning and Manual Setting)
4
4-9-1 AT (Auto-tuning)
z AT Operations
AT is started when at-2 (100% AT), at-1 (40% AT) ata2 (all PID 100% AT), or ata1 (all PID 40%
AT) is specified for the AT Execute/Cancel parameter.
The TUNE indicator will light during execution.
Only the Communications Writing, RUN/RESET, and AT Execution/Cancel parameters can be
changed during AT execution. Other parameters cannot be changed.
AT Calculated Gain
The AT Calculated Gain parameter sets the gain for when PID values are calculated using AT. When
emphasizing response, decrease the set value. When emphasizing stability, increase the set value.
AT Hysteresis
The AT Hysteresis parameter sets the hysteresis when switching ON and OFF for the limit cycle
operation during auto-tuning.
Limit Cycle MV Amplitude
The Limit Cycle MV Amplitude parameter sets the MV amplitude for limit cycle operation during
auto-tuning.
* This setting is disabled for 100% AT.
z 40% AT
• The width of MV variation in the limit cycle can be changed in the Limit Cycle MV Amplitude
parameter, but the AT execution time may be longer than for 100% AT. The limit cycle timing varies
according to whether the deviation (DV) at the start of auto-tuning execution is less than 10% FS.
z 100% AT
• Operation will be as shown in the following diagram, regardless of the deviation (DV) at the start of
AT execution. To shorten the AT execution time, select 100% AT.
SP
PV
AT started
AT ended
Time
Limit Cycle MV
Amplitude 40%
Deviation ≥ 10% FS
Deviation:
10% FS
Time
Deviation < 10% FS
SP
PV
AT started
AT ended
Limit Cycle MV
Amplitude 40%
Deviation:
10% FS
* The Limit Cycle MV Amplitude parameter is disabled.
SP
PV
AT started
AT ended
Time
Limit Cycle MV
Amplitude 100%

Omron E5*C Series Specifications

General

Brand	Omron
Model	E5*C Series
Category	Controller
Language	English