Operation Setting (S3)+1 - Mitsubishi Electric FX5 User Manual

Operation setting (s3)+1

Forward operation/backward operation
Set the PID control direction (forward or backward).
• During auto-tuning for the limit cycle method
It is necessary to set the PID control direction (forward or backward) for auto-tuning.
• During auto-tuning for the step response method
The PID control direction (forward or backward) is not required, as the direction is automatically set when auto-tuning is
complete.
Operation setting (s3)+1: b0
Forward As the measured value (PV) becomes larger than the target value
operation (SV), the output (MV) increases.
(b0=OFF) For example, cooling is a forward operation.
Backward As the measured value (PV) becomes smaller than the target value
operation (SV), the output (MV) increases.
(b0=ON) For example, heating is a backward operation.
• Relationship between the forward/backward operation and the output (MV), measured value (PV) and target value (SV)
The relationship is as follows.
Output value (MV)
Target value (SV)
Backward
operation
10 PID CONTROL FUNCTION
72
10.6 Details of Parameters
Forward
operation
Measured value (PV)
Operation
Temperature
Measured value (PV)
Temperature
Measured value (PV)
Target value (SV)
Time
Target value (SV)
Time