Ferroequinologis
Plastic
- Joined
- Apr 17, 2020
Hello all!
I finally got my 16in pacemaker ready to run, just need power now!
The lathe is 220v 3phase 7.5hp. I have had a 5hp 3phase motor I took off a compressor years ago when I swapped to a single phase motor. Kept it because, well, I keep everything!
So I've done tons of reading, and I have decided to build a combo RPC, because I got a like new 20hp motor for free.
I've started building my box, with the plan as follows- start the 5hp idler like any other RPC, single phase with a timed contactor with a start capacitor. Once 5hp is running, use the 3phase generated by the 5hp to start the 20hp. Once the 20hp is online, I can either leave the 5hp running for better phase balance/generation, or shut it off. The 5hp will have run capacitors to balance it as a single RPC, so if I get a 3hp or less machine I can run just it. The 20hp will have run capacitors as well when it is online.
So, onto my questions/concerns- my 20hp is a 3600rpm motor, with delta connection high and low voltage. The 5hp motor, is a 1800rpm, I can't find the wiring online for it but the plate just has a Y in between the low and high voltage wiring diagrams, so I assume is wired in a wye.
Will these two idlers be ok together? I have read about delta RPCs running wye wired equipment, and visa versa, so I assume (dreaded word) they should be fine. They will not be physically connected.
Anyone have any thoughts or advice? I really wanted to use the 5hp to start the 20hp to reduce the stress of getting the 20hp going on single phase, and so I can have a small RPC for light loads, or a nice large size one for my eventual equipment expansion.
Thanks!
I finally got my 16in pacemaker ready to run, just need power now!
The lathe is 220v 3phase 7.5hp. I have had a 5hp 3phase motor I took off a compressor years ago when I swapped to a single phase motor. Kept it because, well, I keep everything!
So I've done tons of reading, and I have decided to build a combo RPC, because I got a like new 20hp motor for free.
I've started building my box, with the plan as follows- start the 5hp idler like any other RPC, single phase with a timed contactor with a start capacitor. Once 5hp is running, use the 3phase generated by the 5hp to start the 20hp. Once the 20hp is online, I can either leave the 5hp running for better phase balance/generation, or shut it off. The 5hp will have run capacitors to balance it as a single RPC, so if I get a 3hp or less machine I can run just it. The 20hp will have run capacitors as well when it is online.
So, onto my questions/concerns- my 20hp is a 3600rpm motor, with delta connection high and low voltage. The 5hp motor, is a 1800rpm, I can't find the wiring online for it but the plate just has a Y in between the low and high voltage wiring diagrams, so I assume is wired in a wye.
Will these two idlers be ok together? I have read about delta RPCs running wye wired equipment, and visa versa, so I assume (dreaded word) they should be fine. They will not be physically connected.
Anyone have any thoughts or advice? I really wanted to use the 5hp to start the 20hp to reduce the stress of getting the 20hp going on single phase, and so I can have a small RPC for light loads, or a nice large size one for my eventual equipment expansion.
Thanks!