Omron EJ1G, Руководство пользователя

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68
Setting Control Specifications
Section 5-3
5-3-2 Selecting the Control Method
Gradient temperature control or 2-PID control can be selected as the control
method.
Note The control method can be set only while operation is stopped.
If the control method is changed, execute a software reset or cycle the power
to enable the setting.
Gradient Temperature
Control
Gradient temperature control is set using the Proportional Band (P), Integral
Time (I), Derivative Time (D), and Control Balance Coefficient parameters.
■
PID Settings
When using gradient temperature control, use gradient tuning (GT) to set the
PID constants.
Gradient tuning will automatically set the optimum PID constants (i.e., the pro-
portional band, integral time, and derivative time).
Note Refer to 5-3-6 Tuning for information on gradient tuning (GT).
Note (1) Refer to 5-7-1 Bank Function for information on bank specifications.
(2) The decimal point position is determined by the setting for the Decimal
Point Position B parameter. If, however, the Decimal Point Position B pa-
rameter is set to 0 (****), it will be treated as setting 1 (***.*).
If the temperature fluctuates even after GT has been executed, adjust using
the same PID constants for all channels in the group. The method for adjust-
ing PID is the same as for adjusting PID for 2-PID control. If the performance
is still unsatisfactory, use the rules outlined in the following table to adjust the
PID for the appropriate channel.
Variable type Parameter name Setting range Default
F1/B1 Control Type (Group) 0: Gradient tem-
perature control
1: 2-PID control
0
Conditions for use No special conditions.
Variable type Parameter name Setting range Default
D0/90 Proportional Band (Bank) 0.1 to 999.9 EU
(See note 2.)
8.0
Integral Time (Bank) 0 to 3999 Seconds 233
Derivative Time (Bank) 0.0 to 999.9 Seconds 40.0
Conditions for use No special conditions.
If the temperature is fluctuating for all
channels: Adjust the PID for the initial channel.
If the temperature for the initial channel
is fluctuating: Adjust the PID for the initial channel and
channel 1.
If the temperature is fluctuating for the
last channel: Adjust the PID for the last channel.
If the temperature is fluctuating for a
channel other than those outlined above: Adjust the PID for that channel and the
next channel.