5-126
F codes
E codes
C codes
P codes
H codes
A codes
b codes
r codes
J codes
d codes
U codes
y codes
Chap. 5 FUNCTION CODES
Feedback filter (J06) Data setting range: 0.0 to 900.0 (s)
J06 specifies the time constant of the filter for feedback signals under PID control. (This setting is used to stabilize the
PID control loop. Setting too long a time constant makes the system response slow.)
To specify the filter for feedback signals finely under PID dancer control, apply filter time constants for analog
input (C33, C38 and C43).
J08, J09 PID Control (Pressurization starting frequency, pressurizing time)
J15 (PID Control, Stop frequency for slow flowrate)
J16 (PID Control, Slow flowrate level stop latency)
J17 (PID Control, Starting frequency)
Slow flowrate stopping function (J15 to J17)
J15 to J17 configure the slow flowrate stopping function in pump control, a function that stops the inverter when the
discharge pressure rises, causing the volume of water to decrease.
When the discharge pressure has increased, decreasing the reference frequency (output of the PID processor) below the
stop frequency for slow flowrate level (J15) for the period of slow flowrate level stop latency (J16), the inverter
decelerates to stop, while PID control itself continues to operate. When the discharge pressure decreases, increasing the
reference frequency (output of the PID processor) above the starting frequency (J17), the inverter resumes operation.
PID control (Stop frequency for slow flowrate) (J15) Data setting range: 0.0 (Disable), 1.0 to 500.0 (Hz)
J15 specifies the frequency which triggers slow flowrate stop of inverter.
PID control (Slow flowrate level stop latency) (J16) Data setting range: 0 to 60 (s)
J16 specifies the period from when the PID output drops below the frequency specified by J15 until the inverter starts
deceleration to stop.
PID control (Starting frequency) (J17) Data setting range: 0.0 to 500.0 (Hz)
J17 specifies the starting frequency. Set J17 to a frequency higher than the stop frequency for slow flowrate (J15). If the
specified starting frequency is lower than the stop frequency for slow flowrate, the latter stop frequency is ignored; the
slow flowrate stopping function is triggered when the output of the PID processor drops below the specified starting
frequency.
Assignment of PID-STP ("Motor stopped due to slow flowrate under PID control")
(E20 to E24 and E27, data = 44)
Assigning the digital output signal PID-STP to any of the programmable, output terminals with any of E20 through E24
and E27 (data = 44) enables the signal to output when the inverter stops due to the slow flowrate stopping function
under PID control.
For the slow flowrate stopping function, see the chart below.
Pressurization before slow flowrate stopping (J08 and J09)
Specifying J08 (Pressurization starting frequency) and J09 (Pressurizing time) enables pressurization control when the
frequency drops below the level specified by J15 (Stop frequency for slow flowrate) for the period specified by J16.
During the pressurization, the PID control is in the hold state.
This function prolongs the stopping time of equipment with a bladder tank by pressurizing immediately before the
frequency drops below the level at which the inverter stops the motor, thus enabling energy saving operation.
Because the pressurization starting frequency (J08) can be specified with a parameter, pressurization setting suitable for
the equipment is possible.
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