Heating And Cooling Control; On/Off Control - Omron E5EK DEVICENET User Manual

J ON/OFF control
F Hysteresis
Parameters
• Switching between 2-PID control and ON/OFF control is carried out
by the "PID / ON/OFF" parameter (expansion mode). When this
parameter is set to [
[ ], ON/OFF control is selected. Default is [
• In ON/OFF control, hysteresis is provided in the program when
switching between ON and OFF to stabilize operation. The hysteresis
width provided during ON/OFF control is simply referred to as "hys-
teresis." Control output (heat) and control output (cool) functions are
set in the "hysteresis (heat)" and "hysteresis (cool)" parameters, re-
spectively.
• In standard control (heating or cooling control), hysteresis can be set
only for the heating side.
ON
OFF
• In heating and cooling control, a dead band can be set. So, 3-position
control is made possible.
Hysteresis (heat)
ON
Heating
side
OFF
Symbol Parameter Name: Mode
Control output 1
assignment
Control output 2
assignment
Direct/Reverse
operation
Dead band
Cooling coefficient
MV at stop
MV at PV error
Hysteresis (heat)
Hysteresis (cool)
PID / ON/OFF
4.1 Selecting the Control Method
], 2-PID control is selected, and when set to
Hysteresis (heat)
PV
Set point
Dead band
Hysteresis (cool)
Cooling side
Set point
For specifying control method
: Setup
For specifying control method
: Setup
For specifying control method
: Setup
: Level 1

Heating and cooling control

: Level 1 Heating and cooling control
: Level 2 Manipulated variable when control
operation is stopped
: Level 2 Manipulated variable when control
operation is PV error
: Level 1

ON/OFF control

: Level 1 ON/OFF control
: Expansion ON/OFF control
].
PV
Description
4--3