On/Off Control - Omron E5CK User Manual

J ON/OFF control
F Hysteresis
Parameters
Switching between advanced PID control and ON/OFF control is car-
ried out by the "PID / ON/OFF" parameter (expansion mode). When this
parameter is set to [
set to [ ], ON/OFF control is selected. Default is [
In ON/OFF control, hysteresis is provided in the program when switch-
ing between ON and OFF to stabilize operation. The hysteresis width
provided during ON/OFF control is simply referred to as "hysteresis."
Control output (heat) and control output (cool) functions are set in the
"hysteresis (heat)" and "hysterisis (cool)" parameters, respectively.
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 con-
trol 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
Hysteresis (heat)
Hysteresis (cool)
PID / ON/OFF
4.1 Selecting the Control Method
], advanced PID control is selected, and when
Hysteresis (heat)
PV
Set point
Dead band
Hysteresis (cool)
Cooling side
Set point
For specifying control method
: Setup
For specifying control method
: Setup
: Setup For specifying control method
: Level 1 Heating and cooling control
: Level 1 Heating and cooling control
: Level 2 Manipulated variable when control
operation is stopped
: Level 1

ON/OFF control

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