Importance

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Abstract

A transport vehicle transports an article. The transport vehicle includes a traveler including a traveler driver, a controller that controls the traveler, and a power supply unit that receives power from an external source and supplies the power at least to the traveler and the controller. The controller monitors a target voltage applied by the power supply unit to the traveler. The controller performs, during travel of the transport vehicle, a deceleration and stop process of decreasing a travel speed of the transport vehicle to stop the travel of the transport vehicle in response to the target voltage being lower than or equal to a determination threshold. The determination threshold is lower than a voltage of the power supply unit in normal operation and higher than a lower limit voltage. The lower limit voltage is a minimum voltage to cause the traveler to operate.

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First Claim