Selecting The Temperature Unit; Selecting Pid Control Or On/Off Control; Setting Output Specifications; Temperature Unit - Omron E5AN User Manual

Selecting the Temperature Unit

3-3

Selecting the Temperature Unit

3-3-1

Temperature Unit

Operating Procedure
Operation Level
C
30
0
Initial Setting Level
Input Type
in-t
5
Temperature
d-u
Unit
c
3-4

Selecting PID Control or ON/OFF Control

2-PID Control
ON/OFF Control
3-5

Setting Output Specifications

3-5-1

Control Periods

Control Period
c p
(Heating)
Control Period
c-cp
(Cooling)
54
• 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).
The following example shows how to select C as the temperature unit.
1. Press the O Key for at least three seconds to move from the operation
level to the 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.
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 onof, ON/OFF con-
trol, is selected. The default is onof.
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.
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).
• Set the output periods (control periods). Though a shorter period provides
better control performance, it is recommended that the control period be
set to 20 seconds or longer for a relay output to preserve the service life
of the relay. After the settings have been made in the initial setup, readjust
the control period, as required, by means such as trial operation.
• Set the control periods in the Control Period (Heating) and Control Period
(Cooling) parameters in the initial setting level. The default is 20 seconds.
• The Control Period (Cooling) parameter is used only for heating/cooling
control.
• When control output 1 is used as a current output, Control Period (Heat-
ing) cannot be used.
Section 3-3