ACD320 user manual
Parameter Description
interference.
Function Code
Name
Setting Range
Default
Value
F4.25
Sampling cycle time (T)
0.01～100.00s
0.10s
F4.26
PID control discrepancy
limit
0.0～100.0%
0.0%
Sampling time (T): is the time to sample the feedback value. In each sampling period the
controller runs one time. The longer the sampling time, the slower the responding.
PID control discrepancy limit: the allowable maximum discrepancy of PIDsystem output
value relative to the closed-loop assigned value.As shown in following diagram,within the
discrepancy limit, PID controller stops adjustment. Properly setting this function code can
improve the accuracy and stability of PIDsystem.
Fig. 6-19 Coincidence relation of discrepancy limit and output frequency
Function Code
Name
Setting Range
Default
Value
F4.27
Feedback disconnection
0.0～100.0%
0.0%
detecting value
F4.28
Feedback disconnection
0.0～3600.0s
1.0s
detecting time
Feedback disconnected detecting value: this detecting value is relative to the full range
(100%).
The system detects the PID feedback value all the time.When the feedback value is less or
equal to the feedback disconnected detecting value, the system starts to time the detection.When
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