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the Temperature Control Unit is adjusted. If the hunting is not within the permissi-
ble range determined by the user, use advanced PID control.
SP
PV
MV
100%
0%
Temperature
Hysteresis
Time
3-5-4 Advanced PID Control
If advanced PID control (i.e., SW1-1 is turned ON) is selected, the Temperature
Control Unit will operate with the P value fixed to 40.0, the I value fixed to 240,
and the D value fixed to 40.
The user’s required control may not be performed with the default PID parame-
ters. In this case, refer to 2-6 AT (Expansion Mode) and 3-6-1 Manual Settings
(Expansion Mode) to set the most suitable PID parameters.
Even if the most suitable PID parameters are set, hunting may occur if the con-
trol period is long. In this case, set SW1-6 according to the characteristics of the
controlled object. If SW1-6 is turned OFF, the control period will be 20 s and if
SW1-6 is turned ON, the control period will be 2 s.
When the control period is set to 2 s (i.e., SW1-6 is turned ON), it can be set to 1
through 99 s freely. Refer to 3-6-1 Manual Settings (Expansion Mode) for details.
Application Examples
Section 3-5
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