Omron EJ1G, User Manual

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Setting Control Specifications
Section 5-3
■
Limit Cycle MV Amplitude
Sets the MV amplitude during limit cycle operation in autotuning.
Note This parameter is disabled for 100% AT.
■
Temporary AT Execution Judgment Deviation
When autotuning has been executed, temporary autotuning will be executed if
the deviation specified in this parameter is exceeded.
Note This parameter is disabled for 100% AT.
■
40% AT
• The width of MV variation in the limit cycle can be changed with the Limit
Cycle MV Amplitude parameter. In this case, autotuning will take longer to
execute than it does with 100% AT.
• The timing of the limit cycle's onset depends on whether the deviation at
the start of autotuning (DV) is less than the Temporary AT Execution
Judgment Deviation.
■
100% AT
• When autotuning starts, it operates as shown below regardless of the
deviation (DV). When you want to shorten the time it takes for autotuning,
select 100% AT.
Note The Limit Cycle MV Amplitude and Temporary AT Execution Judgment Devia-
tion parameters are disabled.
5-3-7 Disturbance Overshoot Adjustment Function
The Disturbance Overshoot Adjustment Function adjusts the control wave-
form when an external disturbance impacts the system.
• When using this function, set the Disturbance Overshoot Adjustment
Function parameter to 1 (Enabled).
Deviation
≥
Temporary AT Execution
Judgment Deviation
Temporary AT
Execution Judgment Deviation
(Default: 150.0) Temporary AT
Execution Judgment Deviation
(Default: 150.0)
Deviation < Temporary AT Execution
Judgment Deviation
Set point
Process
value
Autotuning starts Autotuning completed
Time
Limit Cycle
MV Amplitude 40%
Set point
Process
value
Autotuning starts Autotuning completed
Time
Limit Cycle
MV Amplitude 40%
Set point
Process
value
Autotuning starts Autotuning completed
Limit Cycle
MV Amplitude 100%
Time