• Speed search for general acceleration: If bit 1 is set to 1 and
the inverter operation command runs, acceleration starts with
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 output voltage. The speed search function
prevents such fault trip from occurring.
• Initialization after a fault trip: If Bit 2 is set to 1 and Pr.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 reset of a fault trip: 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 Cn.72, the voltage
stops increasing and the frequency decreases (t1 zone). If the
current decreases below the value set at Cn.72, the voltage
increases again and the frequency stops decelerating (t2 zone).
When the normal frequency and voltage are resumed, the speed
search operation accelerates the motor back to its frequency
reference before the fault trip.
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