Speed Search Operation
Speed Search is used to start the inverter while the motor/load are already spinning (idling). Speed
Search synchronizes the inverter output (voltage and frequency) to that of the spinning motor. This
is accomplished by ramping the output voltage up, then ramping the output frequency down..
Speed Search estimates the motor rotation speed based on the inverter output current, therefore it
may not match the exact speed. Speed Search can prevent faults that occur when starting the
inverter while the motor/load are spinning. There are two modes of Speed Search (Flying Start-1
and Flying Start-2). The main differerence is that Flying Start-2 can detect direction of motor
rotation. There are also four conditional settings of Speed Search. These include normal starting,
starting after a fault reset, starting after a power interruption, and auto-starting with the initial
application of power to the inverter.
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