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Selecting the Temperature Unit Section 3-3
3-3 Selecting the Temperature Unit
3-3-1 Temperature Unit
• Either °C or °F can be selected as the temperature unit.
• Set the temperature unit in the Temperature Unit parameter of the initial
setting level. The default is c (°C).
Operating Procedure The following example shows how to select °C as the temperature unit.
3-4 Selecting PID Control or ON/OFF Control
Two control methods are supported: 2-PID control and ON/OFF control.
Switching between 2-PID control 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 onoff, ON/OFF con-
trol, is selected. The default is pid. ON/OFF control is not displayed for posi-
tion-proportional models.
2-PID Control PID control is set by AT (auto-tuning), ST (self-tuning), or manual setting.
For PID control, set the PID constants in the Proportional Band (P), Integral
Time (I), and Derivative Time (D) parameters.
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).
Operation Level
1. Press the O Key for at least three seconds to move from the operation
level to the initial setting level.
Initial Setting Level
2. Select the Temperature Unit parameter by pressing the M Key.
Press the U or D Key to select either °C or °F.
c: °C
f: °F
3. To return to the operation level, press the O Key for at least one second.
C
30.0
0.0
in-t
5
Input Type
d-u
c
Temperature
Unit
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