Pid Control - Autonics TM Series User Manual

6 Parameter Settings and Functions
6.3.2.1 Hysteresis Settings
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6.3.3

PID Control

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62
An ON/OFF control feature is used to define the control output ON/OFF points.
ON_Hysteresis sets the output on point and OFF_Offset sets the off point.
Setting hysteresis too low can result in hunting induced by disturbance (noise,
chattering, etc.). To minimize hunting, set ON_Hysteresis and OFF_Offset values
according to the heater or cooler's capacity and thermal characteristics, control
subject and sensor response characteristics, installation conditions, and other
defining factors.
Preceding
Group
Condition
Control Heating
Operation and
Group Cooling
PID control is a combination of proportional (P), integral (I), and derivative (D)
controls and offers superb control over control subjects, even with a delay time.
Proportional control (P) implements smooth, hunting-free control; integral control (I)
automatically corrects offsets; and derivative control (D) speeds up the response to
disturbance. Through these actions, PID control realizes ideal temperature control.
How to apply PID control
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Parameter
Heating_ON Hysteresis
Heating
Heating_OFF Offset
Cooling_ON Hysteresis
Cooling
Cooling_OFF Offset
Proportional (P) control: Set both integral and derivative times to
0 after PID control is selected.
Proportional-Integral (PI) control: Set the derivative time to 0
after PID control is selected.
Proportional-Derivative (PD) control: Set the integral time to 0
after PID control is selected.
When using the multi-SV function, the same PID time constant
will be applied to SV0 to SV3.
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Factory
Range
Default
1~100 2
0~100 0
1~100 2
0~100 0