Randalthor
Cast Iron
- Joined
- Mar 7, 2018
- Location
- Kansas City
I have looked through threads and haven't found the answers to these questions (although I'm sure they are on the forum somewhere).
I need a VFD to convert 1-phase to 3-phase for the vari-speed mill above. I don't care about features, but do care about longevity. I don't want to spend more than $400. I'd rather not go with an RPC because of added noise.
I've read the better brands like Weg, Hitachi, Yaskawa, Eaton??? give a better service life than cheap ones, capacitors being the weak link.
My question is, is there spec the manufacturer may publish, which indicates how long their capacitors will last? If you oversize the VFD for the application (i.e. get a 3 hp VFD for a 1-1/2 motor) will that give you a larger "capacitor bank" or use up the "bank" less quickly?
Lastly, I've read VFD's have the potential to send harmonics upstream. I don't want to destroy any electronics upstream. I think I've read there is some kind of device to prevent that, or does that only occur with cheap VFD's? Can someone clarify please?
I'd rather avoid an RPC because of the added noise.
I need a VFD to convert 1-phase to 3-phase for the vari-speed mill above. I don't care about features, but do care about longevity. I don't want to spend more than $400. I'd rather not go with an RPC because of added noise.
I've read the better brands like Weg, Hitachi, Yaskawa, Eaton??? give a better service life than cheap ones, capacitors being the weak link.
My question is, is there spec the manufacturer may publish, which indicates how long their capacitors will last? If you oversize the VFD for the application (i.e. get a 3 hp VFD for a 1-1/2 motor) will that give you a larger "capacitor bank" or use up the "bank" less quickly?
Lastly, I've read VFD's have the potential to send harmonics upstream. I don't want to destroy any electronics upstream. I think I've read there is some kind of device to prevent that, or does that only occur with cheap VFD's? Can someone clarify please?
I'd rather avoid an RPC because of the added noise.