Omron E5AK PROGRAMMABLE TYPE User Manual page 67

J ON/OFF control
F Hysteresis
• 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 [
when set to [ ], ON/OFF control is selected. Default is [
• During position-proportional control, ON/OFF control cannot be se-
lected.
• 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
4.1 Selecting the Control Method
], advanced PID control is selected, and
Hysteresis (heat)
PV
Set point
Dead band
Hysteresis (cool)
Cooling side
Set point
].
PV
4--5