Direct And Reverse Operation - Omron E5 Getting Started Manual

Setting Output Specifications
3-5-2

Direct and Reverse Operation

Operating Procedure
Operation Level
C
30
0
Initial Setting Level
Input Type
in-t
5
Temperature
d-u
Unit
c
Control Period
cp
(Heating)
20
• Direct operation increases the manipulated variable whenever the pro-
cess value increases. Reverse operation decreases the manipulated vari-
able whenever the process value increases.
Manipulated variable
100%
0%
Low Set Value
temperature
Direct operation
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, reverse operation is
used in a heating control system. Direct operation is used in a cooling con-
trol system, in which the operation is the opposite of a heating control sys-
tem. The Control Output 1 Assignment is set to o (control output (heating))
for either direct or reverse operation.
• Direct/reverse operation is set in the Direct/Reverse Operation parameter
in the initial setting level. The default is or-r (reverse operation).
In this example, the input type, temperature unit, direct/reverse operation, and
control period (heat) parameters are checked.
Input type = s (K thermocouple)
Temperature unit = c (°C)
Direct/reverse operation = or-r (reverse operation)
Control period (heat) = 20 (seconds)
1. Press the O Key for at least three seconds to move from the operation
level to the initial setting level.
2. The input type is displayed. When the input type is being set for the first
time, s (K thermocouple) is set. To select a different sensor, press the U
or D Key.
3. Select the Temperature Unit parameter by pressing the M Key. The de-
fault is c (°C). To select f (°F), press the U Key.
4. Select the Control Period (Heating) parameter by pressing the M Key.
The default is 20.
Manipulated variable
100%
0%
High Low
temperature temperature
Reverse operation
Section 3-5
Set Value High
temperature
35