5.3 Description of Function Codes 5.3.8 J codes (Applied functions)
PID control (Pressurization frequency, Pressurization time)
Related function codes: J15 (Low liquid level stop operating frequency level)
J16 (Low liquid level stop elapsed time)
J17 (Starting frequency)
J23 (Low liquid level stop/start feedback deviation)
J24 (Low liquid level stop/start delay time)
Low liquid level stop function (J15 to J17, J23, J24)
Function codes J15 to J17 configure the sleep function in pump control, a function that stops the inverter when the
discharge pressure increases, causing the volume of water to decrease.
When the discharge pressure has increased, decreasing the reference frequency (output of the PID processor)
below the sleep level (J15) for the period specified sleep timer (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 wakeup frequency (J17), the inverter resumes operation.
The restarting conditions can be adjusted with J23 and J24.
PID control (Sleep frequency) (J15)
J15 specifies the frequency which triggers slow flowrate stop of inverter.
PID control (Sleep timer) (J16)
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 (Wakeup frequency) (J17)
J17 specifies the wakeup frequency. Set J17 to a frequency higher than the sleep frequency (J15). If the specified
wakeup frequency is lower than the sleep frequency, the sleep frequency is ignored; the sleep function is triggered
when the output of the PID processor drops below the specified wakeup frequency.
PID low liquid level stop “PID-STP” assignment (Function code E20 to E24, E27, data = 44)
“PID-STP” (“Under sleep mode of PID control”) is ON when the inverter is in a stopped state due to the sleep
function under PID control. PID-STP should be assigned if it is necessary to output a signal to indicate that the
inverter is stopped.
For the sleep function, see the chart below.
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