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78
Setting Control Specifications
Section 4-3
Note
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.
4-3-8
Tuning
Autotuning (AT)
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.
• Executing 40% AT is not possible for heating/cooling control.
• When using the independent cooling/heating PID method, the PID con-
stant will be set automatically for the heating and cooling side.
• Normally the following parameters are left at their default settings.
Note
(1) This parameter can be set only when operation is stopped.
Variable type
Parameter name
Setting range
Default
D5/95
MV Upper Limit (Channel)
−
5.0 to 105.0 (for standard control)
0.0 to 105.0 (for heating/cooling control) %
105.0
MV Lower Limit (Channel)
−
5.0 to 105.0 (for standard control)
−
105.0 to 0.0 (for heating/cooling control) %
−
105.0
Conditions for use
The control method must be set to 2-PID control, and ST must
be disabled.
Output
Heating
MV
MV Upper Limit
MV Lower Limit
Cooling
MV
Output Mode Selection = Heating/cooling control
V1.2
Variable type
Parameter name
Setting range Default
E5/A5
AT Calculated Gain
(Common) 0.1 to 10.0
0.8
AT Hysteresis
(Channel) 0.1 to 999.9 EU
(See note 2.)
0.8
Limit Cycle MV Amplitude
(Common) 5.0 to 50.0 %
20.0
Temporary AT Execution Judgment Deviation
(Channel)
0.0 to 999.9 EU
(See note 2.)
150.0
Conditions for use
The control method must be set to 2-PID control.
V1.2
Summary of Contents for EJ1 EtherCAT
Page 2: ...EJ1 Modular Temperature Controllers User s Manual Revised July 2008 ...
Page 3: ...iv ...
Page 19: ...xx ...
Page 213: ...188 Detailed Description of Services Section 6 4 ...
Page 227: ...202 Detailed Description of Services Section 7 5 ...
Page 303: ...278 Index ...
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