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4 Basic Operation

E5@C Digital Temperature Controllers User’s Manual (H174)

4-8 Using ON/OFF Control (Not Supported for Position-proportional

Models.)

4-8-1 ON/OFF Control

4-8 Using ON/OFF Control (Not

Supported for Position-proportional

Models.)

In ON/OFF control, the control output turns OFF when the temperature being controlled reaches the

preset set point. When the manipulated variable turns OFF, the temperature begins to fall and the con-

trol turns ON again. This operation is repeated over a certain temperature range. At this time, how

much the temperature must fall before control turns ON again is determined by the Hysteresis (Heating)

parameter. Also, what direction the manipulated variable must be adjusted in response to an increase

or decrease in the process value is determined by the Direct/Reverse Operation parameter.

• Switching between 2-PID control and ON/OFF control is performed using the PID ON/OFF parameter

in the Initial Setting Level. When this parameter is set to pid, 2-PID control is selected, and when it is

set to onof, ON/OFF control is selected. The default is onof.

 Hysteresis

• With ON/OFF control, hysteresis is used to stabilize operation when switching between ON and

OFF. The control output (heating) and control output (cooling) functions are set in the Hysteresis

(Heating) and Hysteresis (Cooling) parameters, respectively.

• In standard control (heating or cooling control), the setting of the Hysteresis (Heating) parameter

in the Adjustment Level is used as the hysteresis regardless of whether the control type is heating

control or cooling control.

4-8-1 ON/OFF Control

Hysteresis

Reverse operation

OFF OFFOFF

Time

ONON ONON

Heater

Temperature

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