Auto change does not work while the auxiliary motors are operating. Auto change is operated
only when all the auxiliary motors are stopped and if all the conditions set for the auto change
are met. When the inverter stops, all motors stop operating, and the auxiliary motor with the
highest priority becomes the starting auxiliary motor. If the inverter power is turned off then
turned back on, the auxiliary motor set at AP1-43 (Starting Aux) becomes the starting auxiliary
motor.
The following diagrams depict the auto change operation when AP1-55 (Auto Ch Mode) is set to
‗2 (Main),‘ when the inverter operation time exceeds the auto change interval set at AP1-58. If
the inverter operation frequency is below the frequency set at AP1-57, all the auxiliary motors
including the start auxiliary motor are turned off. After the delay time set at AP1-91 (Interlock DT)
elapses, the ‗Main‘ auto change is operated. After the ‗Main‘ auto change, the auxiliary motor
that was turned on after the starting auxiliary motor becomes the main motor.
In the following diagrams, because auxiliary motor #1 is the starting auxiliary motor. Auxiliary
motor #2 becomes the main motor after the auto change. The auxiliary motor on/off operation is
identical to that of Aux Exchange, and the ‗off‘ conditions differ based on the FIFO/FILO
configuration.
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