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4 Basic Operation
4-5
Selecting PID Control or ON/OFF
Control
Two control methods are supported: 2-PID control and ON/OFF control. Switching between 2-PID con-
trol and ON/OFF control is executed by means of the PID ON/OFF parameter in the initial setting level.
When this parameter is set to pid, 2-PID control is selected, and when set to onof, ON/OFF control, is
selected. The default is pid.
2-PID Control
Use autotuning to set the PID constants, or set them manually.
For PID control, set the PID constants in the Proportional Band (p), Integral Time (i), and Derivative
Time (d) parameters.
For heating and cooling control, also set the Proportional Band (Cooling) (c-p), Integral Time
(Cooling) (c-i), and Derivative Time (Cooling) (c-d).
For details, refer to 4-7 Setting the Set Point (SP).
ON/OFF Control
In ON/OFF control, the control output is turned ON when the process value is lower than the current
set point, and the control output is turned OFF when the process value is higher than the current set
point (reverse operation).
For details, refer to 4-8 Using ON/OFF Control.
4 - 14
E5@D Digital Temperature Controllers User's Manual (H224)
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