LG SV-iC5 Series Instruction Manual page 102

10. Advanced functions
EX) Speed search during Instant Power Failure restart
Speed search is suitable operation when load inertia is great. It is highly recommended to restart
after stopping the motor when the load inertia is great.
Input
voltage
Frequency
Voltage
Current
Multi-function
output or
Relay
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 the rise in current is greater than 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.
t1 t2
H23
10-14
SV-iC5