Tuning - Omron EJ1 User Manual

Setting Control Specifications
Note
4-3-8

Tuning

Autotuning (AT)
Note
Output
Heating
MV
MV Lower Limit
MV Upper Limit
Output Mode Selection = Heating/cooling control
Variable type Parameter name
MV Upper Limit (Channel) − 5.0 to 105.0 (for standard control)
D5/95
MV Lower Limit (Channel) − 5.0 to 105.0 (for standard control)
Conditions for use The control method must be set to 2-PID control.
Set the limits so that the MV Upper Limit > MV Lower Limit.
If the MV Lower Limit > MV Upper Limit, the larger value will function as the
MV Upper Limit.
When autotuning (AT) is executed, the MV is forcibly changed, the control
subject's characteristics are observed (with the limit cycle method), and the
best PID constants are automatically set for the SP during execution.
• Autotuning cannot be executed while control is stopped, during manual
mode operation, or during ON/OFF control.
• Use an operation command to execute autotuning. For details, refer to 6-
4-11 Operation Commands.
• The only parameters that can be received during autotuning are RUN/
STOP, Auto/Manual, AT Execute/Cancel, Alarm 1/2/3 Latch Cancel, and
Alarm Latch Cancel All. Other parameters cannot be changed.
• If the STOP parameter is set during autotuning, autotuning will be can-
celled and operation will stop. Autotuning will not be restarted even if RUN
is set again.
• Normally the following parameters are left at their default settings.
Variable type
E5/A5
AT Calculated Gain
AT Hysteresis
Limit Cycle MV Amplitude
Temporary AT Execution Judgment Deviation
Conditions for use The control method must be set to standard control and 2-PID
control.
(1) This parameter can be set only when operation is stopped.
(2) The decimal point position is determined by the sensor selection. With
analog inputs, the decimal point position is determined by the Decimal
Point Position parameter setting. In this case, however, the 0 (****) deci-
mal point position setting will be treated as setting 1 (***.*).
Cooling
MV
Setting range
0.0 to 105.0 (for heating/cooling control) %
− 105.0 to 0.0 (for heating/cooling control) %
Parameter name
(Common) 0.1 to 10.0
(Channel) 1 to 9999 EU
(Common) 5.0 to 50.0 %
(Channel)
Section 4-3
Default
105.0
−105.0
Setting range Default
0.8
8
(See note 2.)
20.0
0 to 9999 EU 1500
(See note 2.)
75