Yes another VFD question, it seems there are dozens of these but none directly answer my questions.
Most important there are hundreds of VFDs out there and they range from a low of $50-75 up to several hundred dollars for what appears to be the same device. What are the critical features / specs to look for to distinguish one VFD from another? What do you get for paying $300 instead of $75 when they are both rated for the same load?
I'm getting a mill with a 220v 3 phase 3/4hp motor, so I'm going to need a VFD to run it. Looking at VFDs there are relatively few options at 1hp or less, but lots of options in the 3-5hp range. and these larger VFDs in many cases are actually cheaper than the small ones.
I understand that the hp rating is just max load, and a larger VFD can be programmed to control a lower rated motor, so other than being in many cases physically larger there doesn't really seem to be any drawback to getting a higher rated VFD than the minimum required size.
Last question 3phase vs VFD. It appears I do have 3 phase power available at the pole. I'm sure there would be added cost to install a 220v 3 phase outlet vs 220v 1 phase, but would I see any benefit to doing this? The VFD offers me additional speed control so even if I ran 3 phase power it seems I would still want a VFD.
Most important there are hundreds of VFDs out there and they range from a low of $50-75 up to several hundred dollars for what appears to be the same device. What are the critical features / specs to look for to distinguish one VFD from another? What do you get for paying $300 instead of $75 when they are both rated for the same load?
I'm getting a mill with a 220v 3 phase 3/4hp motor, so I'm going to need a VFD to run it. Looking at VFDs there are relatively few options at 1hp or less, but lots of options in the 3-5hp range. and these larger VFDs in many cases are actually cheaper than the small ones.
I understand that the hp rating is just max load, and a larger VFD can be programmed to control a lower rated motor, so other than being in many cases physically larger there doesn't really seem to be any drawback to getting a higher rated VFD than the minimum required size.
Last question 3phase vs VFD. It appears I do have 3 phase power available at the pole. I'm sure there would be added cost to install a 220v 3 phase outlet vs 220v 1 phase, but would I see any benefit to doing this? The VFD offers me additional speed control so even if I ran 3 phase power it seems I would still want a VFD.