bgaidan
Red Skull Member
- Joined
- Jul 18, 2020
- Member Number
- 2322
- Messages
- 2,976
Playing with this little RPC I got "free" with a machine a year or two ago. It's a 2/4 hp - 2hp starting and 4 hp max simultaneous total. I'm hooking it up to run my surface grinder and vertical bandsaw for now. But I also have a 20hp motor tucked away in the corner that I'll eventually use for an RPC for the whole shop.
I got it wired up and spinning this morning. With no load on it, it' makes a horrible vibrating/buzzing sound and I'm seeing about 290v between the generated leg on either of the supply legs. My single phase line voltage sits at about 242.
When I run the 3/4hp surface grinder off of it, the voltage drops, but still seems kind of high to me.
I'm seeing 265v and 275v on the generated leg to either of the single phase feed legs.
Should I be worried about this much varriance? How much voltage variation and higher voltage is too much on these?
This particular unit seems simpler than others I've seen on the web. There are only two big caps behind the panel. I swear others I've seen had half a dozen to a dozen or more. Is it just a size thing (fewer big caps vs. more smaller ones) or is this just a cheaply built unit?
I got it wired up and spinning this morning. With no load on it, it' makes a horrible vibrating/buzzing sound and I'm seeing about 290v between the generated leg on either of the supply legs. My single phase line voltage sits at about 242.
When I run the 3/4hp surface grinder off of it, the voltage drops, but still seems kind of high to me.
I'm seeing 265v and 275v on the generated leg to either of the single phase feed legs.
Should I be worried about this much varriance? How much voltage variation and higher voltage is too much on these?
This particular unit seems simpler than others I've seen on the web. There are only two big caps behind the panel. I swear others I've seen had half a dozen to a dozen or more. Is it just a size thing (fewer big caps vs. more smaller ones) or is this just a cheaply built unit?