Differential Time (S3)+6 - Mitsubishi Electric FX5 User Manual

Differential time (s3)+6

Use the differential time (TD) to respond sensitively to fluctuations in the measured value (PV) caused by disturbance, etc.
and to minimize the fluctuations. Setting range: 0 to 32767 (× 10 ms)
• When the differential time (TD) is large, it prevent large fluctuation in the control target caused by disturbance, etc.
• It is not always necessary to use the differential time (TD) (when disturbance is small, for example).
Deviation
TD3 (PID operation)
Disturbance
TD1 (PID operation)
TD2 (PID operation)
Output value (MV)
TD3 (PID operation)
TD2 (PID operation)
TD1 (PID operation)
Ex.
PID operation in backward operation (heating)
Temperature
Changes caused by disturbance
TD3 (PID operation)
PI operation (without differential operation)
TD2 (PID operation)
TD1 (PID operation)
Output value (MV)
Changes in output caused by disturbance
TD3 (PID operation)
TD1 (PID operation)
TD2 (PID operation)
PI operation (without differential operation)
Deviation (EV)
TD3>TD2>TD1
Target value (SV)
TD3>TD2>TD1
TD3>TD2>TD1
Time
Time
Time
Time
10 PID CONTROL FUNCTION
10.6 Details of Parameters
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