41
3-9
Heating and Cooling Control
•
The E5ZE-8V
Models are used for heating and cooling control.
•
The heating and cooling control function is used for controlling temperatures of
objects radiating heat, such as extruding molding machines. The temperature
of these objects is controlled using heating control and cooling control outputs.
3-9-1 Dead Band/Overlap Band
The dead band/overlap band function adjusts the output method for the propor-
tional output value close to the set point. The following graphs show the heating
and cooling output when using proportional control.
Proportional output value (%)
Proportional output value (%)
Low temperature
Set point
High temperature
Low temperature
Set point
High temperature
Cooling control output
Heating
control
output
Dead band
Cooling control output
Heating
control
output
Overlap band
Process value
Process value
Dead Band Set Value
0
Dead Band Set Value
0
•
If the dead band is too wide, hunting may result.
•
Control output may occur within the dead band for other types of control apart
from proportional control and ON/OFF control.
•
Set the dead band in each memory bank.
•
The setting range of the dead band is –999 to +999
°
C (or
°
F). The default is 0.
Heating and Cooling Control
Section 3-9
