Omron EJ1 User Manual

66
Setting Control Specifications Section 4-3
■ Setting the Alpha
This parameter sets the 2-PID constant alpha (α).
Note Normally, this parameter is left at its default value.
4-3-3 Selecting the Output Mode
Either standard control or heating/cooling control can be selected as the out-
put method.
Note This parameter can be set only when operation is stopped.
Standard Control This mode performs standard heating or cooling control. Set the Direct/
Reverse Operation parameter to reverse operation for heating control or direct
operation for cooling control.
■ Direct Operation (Cooling) and Reverse Operation (Heating)
Direct operation (cooling) refers to control where the manipulated variable is
increased in response to an increase in the process value. Alternatively,
reverse operation (heating) refers to control where the manipulated variable is
decreased in response to an increase in the process value.
For example, when the process value (PV) is lower than the set point (SP) in a
heating control system, the manipulated variable increases according to the
difference between the PV and SP. Accordingly, this is “reverse operation” in a
heating control system and “direct operation” in a cooling control system,
which performs the opposite operation.
Note This parameter can be set only when operation is stopped.
Variable type Parameter name Setting range Default
D5/95 Alpha (Channel) 0.00 to 1.00 0.65
Conditions for use The control method must be set to 2-PID control.
Variable type Parameter name Setting range Default
E5/A5 Output Mode Selection
(Channel)
0: Standard control
1: Heating/cooling control
0
Conditions for use No special conditions
Variable type Parameter name Setting range Default
E5/A5 Direct/Reverse Operation
(Channel)
0: Reverse operation
1: Direct operation
0
Conditions for use No special conditions
Time
Manipulated variable
Set value
100%
0%
Direct o
p
eration
Low
temperature
High
temperature
Reverse o
p
eration
Time
Manipulated variable
Set value
100%
0%
Low
temperature
High
temperatur
e

Omron EJ1 Specifications

General

Brand	Omron
Model	EJ1
Category	Temperature Controller
Language	English