1. Chigawo chonse chachitsulo chosapanga dzimbiri (gawo lolumikizana la njira zitatu ndi njira zinayi zolumikizana bwino) ndizophatikizana komanso zolimba, ndipo ndizosavuta kusuntha.
2. VFD(variable-frequency drive) wowongolera ma motor amatha kuzindikira ntchito yothamanga kwambiri, yomwe ili yolondola komanso yogwira ntchito.Ndipo dongosolo loletsa kuphulika kwathunthu ndi zotheka.