4.1 Selecting the Control Method
E5EK
4--5
•
ON/OFF control is selected by the “PID/ON/OFF” parameter (expan-
sion mode). When this parameter is set to [
], advanced PID con-
trol is selected, and when set to [
], ON/OFF control is selected.
The “ON/OFF control” parameter is factory-set to [
].
•
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
PV
Hysteresis (heat)
Set point
•
In heating and cooling control, a dead band can be set. So, 3-position
control is made possible.
ON
OFF
PV
Hysteresis (heat)
Heating
side
Set point
Cooling side
Hysteresis (cool)
Dead band
J
ON/OFF control
F
Hysteresis
Summary of Contents for E5EK
Page 1: ...User s Manual Cat No H089 E1 02 Digital Controller Programmable Type...
Page 24: ...CHAPTER 1 INTRODUCTION 1 14...
Page 36: ...CHAPTER 2 PREPARATIONS 2 12...
Page 162: ...CHAPTER 6 USING THE COMMUNICATIONS FUNCTION 6 20...
Page 176: ...CHAPTER 7 CALIBRATION 7 14...
Page 193: ...SETTING LIST A 11...