• Speed search for general acceleration: If bit 1 is set to 1 (enabled),
speed search is enabled for normal accerlating starts with rotating
motor/load.
• Initialization after a fault: If Bit 2 is set to 1 (enabled) and Pr.08 (RST
Restart) is set to 1 (Yes), after a fault reset, speed search accelerates
the motor to the operating frequency used before the fault.
• Automatic restart after power interuption: If bit 3 is set to 1
(enabled), and if a low voltage trip occurs due to a power interruption
but the power is restored before the inverter power shuts down,
speed search accelerates the motor back to its operating frequency
prior to the low voltage trip.
When an instantaneous power interruption occurs, the inverter
generates a low voltage trip and blocks the output. When the input
power returns, speed search accelerates the motor back to its
operating frequency prior to 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, speed search accelerates the motor back to
its operating frequency prior to the fault.
• Starting with power-on: Set bit 4 to 1 (enabled) and Ad.10 (Power-
on Run) to 1 (Yes). If inverter input power is applied and the run
command is active (on), speed search accelerates the motor up to the
frequency reference.
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