Using On/Off Control; On/Off Control - Omron E5AN-H User Manual

Using ON/OFF Control

Operating Procedure
Operation Level
C
30.0
0.0
Bank Setting Level
Display Bank
d.bnk
Selection
0
d.bnk
3
Bank 3 SP 1
C
3.lsp
0.0
Bank 3 SP 1
C
3.lsp
200.0
3-7

Using ON/OFF Control

3-7-1

ON/OFF Control

• To change the set point, select the bank number in the Display Bank
Selection parameter in the bank setting level, and press the U or D Key
in the SP parameter (in the bank setting level) for each bank to set the
desired set value. The new set point will be selected two seconds after the
new value has been specified.
• If the SP parameter is changed in the operation level, the change will be
reflected in the set point for the current bank.
• The bank function can be used to change eight set points. For details,
refer to Banks on page 129.
In this example, the set point in bank 3 is changed from 0°C to 200°C.
1. Normally, the Process Value/Set Point parameter is displayed. The set
point is 0.0°C.
2. The current bank number will be displayed.
Press the O Key to move the bank setting level.
3. Press the U or D Key to set 3.
4. Select the Bank 3 SP parameter by pressing the M Key.
5. Press the U and D Keys to set 200.0.
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 control turns ON again. This oper-
ation 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 Hys-
teresis (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 parame-
ter is set to pid, 2-PID control is selected, and when it is set to onof, ON/
OFF control is selected. The default is pid.
• ON/OFF control can be set for standard models only.
Section 3-7
57