Omron E5AZ, User Manual

Page: 64 / 208

41
Using ON/OFF Control
Section 3-7
Hysteresis
• With ON/OFF control, hysteresis is used to stabilize operation when
switching between ON and OFF. The control output (heating) and control
output (cooling) functions are set in the “hysteresis (heating)” and “hyster-
esis (cooling)” parameters, respectively.
• In standard control (heating or cooling control), the setting of the “hystere-
sis (heating)” parameter in the adjustment level is used as the hysteresis
regardless of whether the control type is heating control or cooling con-
trol.
Three-position
Control
• In heating/cooling control, a dead band (an area where both control out-
puts are 0) can be set to either the heating or cooling side. This makes it
possible to use 3-position control.
Parameters
3-7-2 Settings
To execute ON/OFF control, set the “set point,” “PID ON/OFF,” and “hystere-
sis” parameters.
Setting the “PID ON/OFF” Parameter
Operating Procedure Confirm that the “PID ON/OFF” parameter is set to
onof
in the initial setting
level.
PV
ON
OFF
Reverse operation
Hysteresis (heating)
Set point
Symbol Parameter: Level Application
s-hc
cntl
orev
c-db
c-sc
hys
chys
Standard or heating/cooling: Initial setting level
PID ON/OFF: Initial setting level
Direct/reverse operation: Initial setting level
Dead band: Adjustment level
Cooling coefficient: Adjustment level
Hysteresis (heating): Adjustment level
Hysteresis (cooling): Adjustment level
Specifying control method
Specifying control method
Specifying control method
Heating/cooling control
Heating/cooling control
ON/OFF control
ON/OFF control
PV
ON
OFF
Reverse operation
Dead band
Hysteresis (heating) Hysteresis (cooling)
Heating
side Cooling
side
Set point
Operation Level 1. Press the
O
key for at least three seconds to move from the operation
level to the initial setting level.
C
25
100
PV