CLANG
Plastic
- Joined
- Feb 7, 2009
- Location
- Charleston, WV USA
I recently got a nice Emco Maximat V13 lathe. The motor is 2-speed, 2/2.4 Kw (about 3 HP?), 3-Ph, 440 V only.
I'm collecting parts for a 5 HP RPC, but I'll also need a transformer to get from my shop 240 V 1-Ph to 440 V for the lathe.
I've perused a LOT of articles on here and around the web, and there's a lot of variation in recommendations for Xfrmer size. I've read that 1 kVA /HP is enough, but figuring in start-up draw, motor efficiency, etc, that doesn't seem like enough. The most general opinion seems to be about 1-1/2 to 2 X the motor HP in kVA, which would put me needing about a 5 or 6 kVA unit for my 3 HP motor.
Any in-the-know confirmation on this? (At least for a while, the lathe will be the only machine powered by this particular setup, and if I add to it's job description in the future, it should still only be running one machine at a time.)
I actually used to be a licensed residential electrician for several years, but this is quite outside my experience.
One other thing-the motor has a magnetic brake-any problems I should be aware of with that, as pertains to the RPC/Xfrmer setup?
Thanks for any help.
I'm collecting parts for a 5 HP RPC, but I'll also need a transformer to get from my shop 240 V 1-Ph to 440 V for the lathe.
I've perused a LOT of articles on here and around the web, and there's a lot of variation in recommendations for Xfrmer size. I've read that 1 kVA /HP is enough, but figuring in start-up draw, motor efficiency, etc, that doesn't seem like enough. The most general opinion seems to be about 1-1/2 to 2 X the motor HP in kVA, which would put me needing about a 5 or 6 kVA unit for my 3 HP motor.
Any in-the-know confirmation on this? (At least for a while, the lathe will be the only machine powered by this particular setup, and if I add to it's job description in the future, it should still only be running one machine at a time.)
I actually used to be a licensed residential electrician for several years, but this is quite outside my experience.
One other thing-the motor has a magnetic brake-any problems I should be aware of with that, as pertains to the RPC/Xfrmer setup?
Thanks for any help.