Omron E5CZ User Manual

67
Executing Heating/Cooling Control Section 4-4
Dead Band • For heating/cooling control, the dead band is set with the set point as its
center. The dead band width is the set value of the “dead band” parame-
ter (adjustment level). Setting a negative value produces an overlapping
band.
• If an overlapping band is set, the bumpless function may not operate
when switching between manual operation and automatic operation.
• The default is 0.0 EU for Controllers with Thermocouple/Resistance Ther-
mometer Universal-inputs and 0.00% FS for Controllers with Analog
Inputs.
Cooling Coefficient If the heating characteristics and cooling characteristics of the control object
are very different and good control characteristics cannot be achieved with
the same PID constants, the cooling coefficient can be used to adjust the pro-
portional band (P) for the control output assigned to the cooling side. Use this
to achieve balanced control between the heating side and cooling side. The
proportional bands (P) for the control outputs assigned to the heating/cooling
sides can be calculated using the following equations.
P for control output assigned to heating side = P
P for control output assigned to cooling side = P for control output assigned to
heating side × cooling coefficient
The cooling coefficient is multiplied by the P for the control output assigned to
the heating side to obtain control with characteristics that differ from those of
the control output assigned to the heating side.
PV
0
PV
0
Output
Dead band: Dead band
width = A positive value
Output
Heating
side
Cooling
side
Set
p
oint
Overlapping dead band: Dead
band width = A negative value
Heating
side
Cooling
side
Set
p
oint
PV
0
PV
0
Output Output
P for control output
assigned to heating side
P for control output
assigned to heat-
ing side × 1.0
P for control output
assigned to cooling side
Set point
P for control output assigned to
heating side × 0.8
P for control output
assigned to heating side
P for control output
assigned to heat-
ing side × 1.0
P for control output
assigned to cooling side
P for control output assigned to
heating side × 1.5

Omron E5CZ Specifications

General

Display Type	7-segment digital display
Dimensions	48 x 48 x 78 mm
Number of Control Outputs	1
Ambient Operating Temperature	-10 to 55°C
Control Method	PID control, ON/OFF control
Input Type	Thermocouple, RTD
Supply Voltage	100 to 240 VAC
Output Type	Relay, Voltage, Current
Alarm Output	1 or 2 (depending on model)
Setting Resolution	0.1 or 1 (depending on input type)
Protection Rating	IP20
Ambient Operating Humidity	25% to 85% RH (non-condensing)