Omron E5EK - MANUAL 2 User Manual page 48

+ ON/OFF control
' 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 [ ], 2 PID control is selected, and when set to [
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
MV at PV error
Hysteresis (heat)
Hysteresis (cool)
PID / ON/OFF
].
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
], ON/
PV
Description
4–3