Omron E5 Z Series User Manual

113
Adjustment Level Section 5-4
These parameters set PID control constants. PID constants are automatically
set when AT or ST is executed.
P action: Refers to control in which the MV is proportional to the deviation
(control error).
I action: Refers to a control action that is proportional to the time integral of
the deviation. With proportional control, there is normally an offset
(control error). Proportional action is thus used in combination with
integral action. As time passes, this control error disappears, and
the control temperature (process value) comes to agree with the set
point.
D action: Refers to a control action that is proportional to the time derivative
of the control error. The proportional control and integral control cor-
rect for errors in the control result, and thus the control system is
late in responding to sudden changes in temperature. The deriva-
tive action increases the MV in proportion to the slope of the change
in the temperature as a corrective action.
Note Set “none” as the unit for Controllers with Analog Inputs.
Related Parameters
AT execute/cancel (adjustment level): Page 108
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.
In heating/cooling control, the proportional band P for the cooling control out-
put is calculated using the following formula to set the cooling coefficient:
Cooling control output side P = Cooling coefficient × P (proportional band)
p Proportional Band
The control must be set to 2-PID
control.
i Integral Time
d Derivative Time
Function
Setting
Parameters Models Setting range Unit Default
Proportional
band
Controllers with Thermocouple/
Resistance Thermometer Univer-
sal-inputs
0.1 to 999.9 °C or °F
(See note. )
8.0
Controllers with Analog Inputs %FS 10.0
Integral time 0 to 3999 Second 233
Derivative time 0 to 3999 Second 40
See
See
c-sc Cooling Coefficient
The control must be heating/cooling
control and 2-PID control.
Setting range Unit Default
0.01 to 99.99 None 1.00
Function
Setting
■

Omron E5 Z Series Specifications

General

Brand	Omron
Model	E5 Z Series
Category	Temperature Controller
Language	English