Speed search for general acceleration: If bit 1 is set to ‗1‘ and the
inverter operation command runs, acceleration starts with the speed
search operation. When the motor is rotating under load, a fault trip may
occur if the operation command is run for the inverter to provide voltage
output. The speed search function prevents such fault trips from
occurring.
Initialization after a fault trip other than an LV trip: If bit 2 is set to ‗1‘
and PRT-08 (RST Restart) is set to ‗1 (Yes)‘, the speed search operation
automatically accelerates the motor to the operation frequency used
before the fault trip when the [Reset] key is pressed (or the terminal
block is initialized) after a fault trip.
Automatic restart after a power interruption: If bit 3 is set to ‗1,‘ and if
a low voltage trip occurs due to a power interruption but the power is
restored before the internal power shuts down, the speed search
operation accelerates the motor back to its frequency reference before
the low voltage trip.
If an instantaneous power interruption occurs and the input power is
disconnected, the inverter generates a low voltage trip and blocks the
output. When the input power returns, the operation frequency before
the low voltage trip and the voltage is increased by the inverter‘s inner PI
control.
If the current increases above the value set at CON-72, the voltage
stops increasing and the frequency decreases (t1 zone). If the current
decreases below the value set at CON-27, the voltage increases again
and the frequency stops decelerating (t2 zone). When the normal
frequency and voltage are resumed, the speed search operation
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