iG5A, product manual - H2flow

EX) Speed search during Instant Power Failure restartInputvoltageFrequencyt1t2VoltageH23CurrentMulti-functionoutput orRelay• When the input power is cut off due to instant power failure, the inverteroutputs Low voltage trip (LV) to hold the output.• When the power is restored, the inverter outputs the frequency before thelow voltage trip and the voltage is increased due to PI control.• t1: If current is increasing over the preset level in H23, the rise in voltagewill stop and the frequency is decreased.• t2: If the opposite of t1 occurs, the increase in voltage starts again and thedecrease in frequency stops.• When the frequency and voltage are restored back to the nominal level,acceleration will continue at the frequency before trip. Speed search operation is suitable for loads with high inertia. Stop the motor and restart whenfriction in load is high. SV-iG5A keeps normal operation when instant power failure occurs and power is restored in15msec for the use of its inverter rating. Inverter DC link voltage can vary depending on output load quantity. Therefore, Low Voltagetrip may occur when instant power failure is maintained over 15msec or output is higher than itsrating. Instant power failure specification is applied when input voltage to Inverter is 200~230V AC for200V class, or 380~480V AC for 400V class.8-17