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3.4
Setting Output Specifications
■ Direct/reverse
Operation
Operation Value
Low
Temperature
●
"Direct operation" indicates that MV increases as the process value
increases. In contrast, "reverse operation" indicates that MV increases as
the process value decreases.
High
Direct Operation
Temperature
Set Point
For example, for the present values (PV) (temperature) used in heating
control systems, is lower than the set point (SP) ( temperature ), or the
present values (PV) (temperature) the cooling control system present
values (PV) is higher than the set point (SP), MV increases in proportion to
the difference between PV and SP.
The processes described above refer to "reverse operation" for heating
control systems and "direct operation" for cooling control systems.
●
Direct/reverse operation can be set under the "direct/reverse operation"
parameter (initial settings level). The "direct/reverse operation" parameter's
initial setting is "reverse operation".
3.4 Setting Output Specifications
Operation Value
Low
Reverse Operation
Temperature
Set Point
High
Temperature
3-7
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