- Joined
- Jan 1, 2018
- Messages
- 1,211
I built my rotary phase converter 25 years ago using a 10hp cast iron framed motor. I could never figure out the specs on the voltage controlled relay so I used a timing relay instead. It took some experimenting of adding and removing the run capacitors to balance the three legs. I have several VFD's now but I still use my RPC every time I go to the shop.
https://www.ebay.com/itm/7-5HP-Rota...134475?hash=item264360300b:g:rzQAAOSwo4pYNIuX
$119.50 doesn't sound like a bad price to me for a 7.5hp RPC kit. It does have a voltage sensing relay so it would be a single button start. What the kit is missing is the start / stop buttons but you can grab those from any motor contactor box. Capacitors aren't cheap if you order new ones and the caps in this kit are rated for 370vac. I blew several cheap 220v caps trying to save a buck when I was building my RPC. It didn't take too long before I just paid the premium for higher voltage capacitors.
For a first time RPC builder I think that kit sounds like a great deal! I would have bought one if there was one available 25 years ago!
https://www.ebay.com/itm/7-5HP-Rota...134475?hash=item264360300b:g:rzQAAOSwo4pYNIuX
$119.50 doesn't sound like a bad price to me for a 7.5hp RPC kit. It does have a voltage sensing relay so it would be a single button start. What the kit is missing is the start / stop buttons but you can grab those from any motor contactor box. Capacitors aren't cheap if you order new ones and the caps in this kit are rated for 370vac. I blew several cheap 220v caps trying to save a buck when I was building my RPC. It didn't take too long before I just paid the premium for higher voltage capacitors.
For a first time RPC builder I think that kit sounds like a great deal! I would have bought one if there was one available 25 years ago!