5.3 Description of Function Codes 5.3.8 J codes (Applied functions)
PID control (Wakeup level of PID error) (J23)
PID control (Wakeup timer) (J24)
When both of the two conditions below are satisfied (AND), the inverter is restarted.
• The discharge pressure has decreased, increasing the frequency (output of the PID processor) to or above the
wakeup frequency (J17) and the wakeup timer (J24) has elapsed.
• The absolute error of the PV (feedback value) against to the SV (command value) is equal to or higher than the
wakeup level of PID error (J23), and the wakeup time (J24) has elapsed.
Low liquid level stop pressurization function (J08, J09)
By setting the pressurization frequency (J08) and pressurization time (J09), pressurization control is performed after
the low liquid level stop elapsed time (J16) at the low liquid level stop operating frequency level (J15) or less. Hold
is applied to PID control during pressurization.
On equipment with bladder tank, by using this function to apply pressure immediately before stopping to raise the
pressure, it is possible to increase the stopping time to longer than normal, realizing energy-saving operation.
By being able to adjust the pressurization frequency in the parameters, a pressure level appropriate to the
equipment status can be set.
Refer to the following diagram for details on settings and operation.
Fig. 5.3-32
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