Three Phase Load
Three Phase Load
(OP)
Hi There,
I had a three phase 600 vac, 0.5 hp motor which powered through three phase overload and contactor.
Now I realized through supplier that the motor is single phase 120 vac.
Can I not to change the overload and contactor and just make the three phase in series to power the single phase motor after step down the voltage? (the panel is already built and I do not want to change any device)
Any concerns?
Regards,
I had a three phase 600 vac, 0.5 hp motor which powered through three phase overload and contactor.
Now I realized through supplier that the motor is single phase 120 vac.
Can I not to change the overload and contactor and just make the three phase in series to power the single phase motor after step down the voltage? (the panel is already built and I do not want to change any device)
Any concerns?
Regards,






RE: Three Phase Load
I am betting your going to have to change some things depending on what equipment you specified for this installation.
RE: Three Phase Load
RE: Three Phase Load
RE: Three Phase Load
RE: Three Phase Load
RE: Three Phase Load
Surineman, sorry to break the news but it is about 99% likely that you must replace that contactor and overload relay. It is also likely that your 1/2HP 120V motor is integrally protected for thermal overload, most are, rendering the separate OL relay as redundant. If you don't know for sure, put in an OL relay, but be aware that if the motor trips off line and you don't know why, that may be the reason. If you need to have 3-wire control to provide restart protection (i.e. no automatic restart when an OL occurrs), you will need to disable any integral thermal device in the motor and use an external OL relay for sure. If, as it appears from the nature of your question, you are unfamiliar with these issues, please hire a professional.
"Venditori de oleum-vipera non vigere excordis populi"
RE: Three Phase Load
RE: Three Phase Load
"Venditori de oleum-vipera non vigere excordis populi"
RE: Three Phase Load