ʻO ka mea hoʻololi alapine vector moku hana kiʻekiʻe ʻo VFD6900C kahi mea hoʻololi alapine vector o ke au hana kiʻekiʻe. Me ka ikaika hoʻomaka ikaika, ka mana overload ikaika, a me ka mālama ʻana i ke au a me ka voltage i hoʻonui ʻia, loaʻa iā ia nā hana palekana piha e like me ke overcurrent, overvoltage, undervoltage, nā hewa poloka, nā mīkini wela uila, ka wela nui ʻana, ka pōʻai pōkole, ka nalowale o ka pae hoʻokomo a me ka hoʻopuka, ka hoʻonohonoho ʻana i nā ʻano motika maʻamau, a me nā hewa mālama ikehu kūloko.