Hysteresis - Omron E5AK User Manual

CHAPTER 4 APPLIED OPERATION
J ON/OFF control
F Hysteresis
Parameters
4--4
• 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
selected.
• 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
Travel time
Motor calibration
Positional-proportional
dead band
Open/close

hysteresis

Hysteresis (heat)
Hysteresis (cool)
PID / ON/OFF
], advanced PID control is selected, and
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
: Option Position-proportional control
: Option Position-proportional control
Position-proportional control
: Level 1
Position-proportional control
: Level 2
: Level 1 ON/OFF control
: Level 1 ON/OFF control
: Expansion ON/OFF control
].
PV
Description