On/Off Control - Omron E5ZE Operation Manual

Control Method Selection
Manual operation
2-PID control
Power OFF or operation
stopped
Operating Conditions

3-8-2 ON/OFF Control

Hysteresis
40
• When switching between manual operation and 2-PID control, the output val-
ue will enter balanceless, bumpless operation.
Output value (%)
Balanceless, bumpless
operation
0
Output switch
• The manual output value can be set only during manual operation. The manual
output value cannot be set if there is a temperature sensor input error or a Tem-
perature Controller error.
• Manual operation cannot be started if auto-tuning is being executed or there is
a Temperature Controller error.
• The E5ZE-8jjjD1jB (DeviceNet Model) cannot be operated manually if
operation has been stopped. Temperature control must be started with remote
I/O before manual operation can be started. For further details, refer to the
E5ZE-8 Multipoint Temperature Controller DeviceNet Communications Manu-
al (H104).
2-PID control can be switched to ON/OFF control by setting the proportional
band (P constant) to 0.0.
In ON/OFF control, hysteresis is used to stabilize operation when a change is
made to ON/OFF control. The following diagrams show the operation of control
output during ON/OFF control.
Reverse operation
• Set the hysteresis in each memory bank. The settings are only valid when ON/
OFF control is being used.
• The setting range is between 0.0 to 99.9 (°C or °F).
• The default value is 0.8°C or 1.5°F.
Output reset value
Direct operation
Hysteresis
Set point
Section 3-8
Time
Hysteresis
Set point