One or more example embodiments of the present invention include an electric device (20), battery packs (22), and a controller. The electric circuitry (21) includes external relays (211) corresponding to the respective battery packs (22). The controller is configured or programmed to perform an external relay test process to examine whether contacts of a corresponding external relay (211) which corresponds to a second battery pack (22) to be connected to second or later are locked, and, in the external relay test process, if a voltage between the positive and negative external terminals (223a, 223b) of the battery pack (22) is equal to or more than a threshold, determine that the contacts of the external relay (211) are locked, and, if the voltage between the positive and negative external terminals (223a, 223b) of the battery pack (22) is less than the threshold, determine that the contacts of the external relay (211) are normal.


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    Title :

    ELECTRIC WORKING MACHINE AND METHOD OF ACTIVATING ELECTRIC WORKING MACHINE


    Additional title:

    ELEKTRISCHE ARBEITSMASCHINE UND VERFAHREN ZUR AKTIVIERUNG EINER ELEKTRISCHEN ARBEITSMASCHINE
    MACHINE DE TRAVAIL ÉLECTRIQUE ET PROCÉDÉ D'ACTIVATION DE MACHINE DE TRAVAIL ÉLECTRIQUE


    Contributors:
    TAMBA DAIKI (author) / II TSUNEHIRO (author) / TAKASE SHUNYA (author)

    Publication date :

    2025-05-07


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    G01R Messen elektrischer Größen , MEASURING ELECTRIC VARIABLES / H02J CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER , Schaltungsanordnungen oder Systeme für die Abgabe oder Verteilung elektrischer Leistung / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / H01H Elektrische Schalter , ELECTRIC SWITCHES



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