9.2 Details of Function Codes
9-115
Chap. 9 FUNCTION CODES
Feedback filter (J06)
J06 specifies the time constant of the filter for feedback signals under PID control.
- Data setting range: 0.0 to 900.0 (s)
- This setting is used to stabilize the PID control loop. Setting too long a time constant makes
the system response slow.
J15 PID Control (Operation level for slow flowrate stop)
J16 PID Control (Elapsed time from slow flowrate stop)
J17 PID Control (Initiation frequency)
J23 PID Control (Initiation deviation level for slow flowrate stop)
J24 PID Control (Start latency time for slow flowrate stop)
The slow flowrate stop function can be used when the pump constant pressure control is
performed under PID control.
If the discharge pressure increases so that the reference frequency (output of the PID
processor) drops below the operation level (J15) and remains at the low level for the elapsed
time (J16), the inverter decreases to a stop. However, PID control itself continues to operate.
Assigning the PID-STP signal to any of the digital output terminals with any of function
codes E20 and E27 (data = 44) enables the inverter to output the PID-STP signal on that
terminal upon detection of a slow flowrate stop.
When both of the following conditions are met, the inverter restarts.
(1) The discharge pressure decreases so that the reference frequency (output of the PID
processor) increases above the initiation frequency (J17) and the start latency time (J24)
elapses.
(2) The deviation between SV (commanded value) and PV (feedback amount) exceeds the
initiation deviation level (J23) and the start latency time (J24) elapses.
Function code Name Data setting range
J15 Operation level 0.0 (Disable slow flowrate stop), 1.0 to 400.0 Hz
J16 Elapsed time 0 to 3600 s
J17 Initiation frequency 0.0 to 400.0 Hz
J23 Initiation deviation level 0.0 to 100.0%
J24 Start latency time 0 to 3600 s
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