LS SV-iG5H Series, Руководство пользователя, Страница: 138 / 226

Advanced functions
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EX) Speed search during Instant Power Failure restart
- When the input power is cut off due to instant power failure, the inverter outputs Low
voltage trip (LV) to hold the output.
- When the power is restored, the inverter outputs the frequency before the low 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 voltage will stop and
the frequency is decreased.
- t2: If the opposite of t1 occurs, the increase in voltage starts again and the decrease in
frequency stops.
- When the frequency and voltage are restored back to the nominal level, acceleration
will continue at the frequency before trip.
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Speed search operation is suitable for loads with high inertia. Stop the motor and restart
when friction in load is high.
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SV-iG5H keeps normal operation when instant power failure occurs and power is
restored in 15msec for the use of its inverter rating.
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Inverter DC link voltage can vary depending on output load quantity. Therefore, Low
Voltage trip may occur when instant power failure is maintained over 15msec or output
is higher than its rating.
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Instant power failure specification is applied when input voltage to Inverter is 200-230V
AC for 200V class, or 380-480V AC for 400V class.