|Forum topic by DylanC||posted 02-02-2011 04:02 AM||5449 views||0 times favorited||21 replies|
02-02-2011 04:02 AM
[NOTE]: Just in case anyone reads my blog, a similar post appears there.
I just replaced a PoS Craftsman benchtop/portable table saw with a Delta 34-806 Unisaw (5 HP, 3 Phase motor). I planned on powering the saw with a medium-duty 5 HP static phase converter from Enco (www.use-enco.com) for ~$120. So, I bought the saw and ordered the phase converter.
Today, I called Enco technical support after receiving an e-mail that basically stated all customers purchasing phase converters need to consult with technical support about the application. After explaining that I would be starting the motor under very light loads (just the pulleys and the blade) and that the motor would almost never be loaded to the full 5 HP (typically 3 or less), I was told that the medium duty phase converter was basically capable of starting and running an unloaded 5 HP motor. Under almost any other circumstances they recommend their “heavy-duty” phase converters. For my 5 HP motor the cost would go up to just under $200.
Hmm…not great news. I knew that running this saw with a static phase converter was kind of a cobble-job to begin with, but for $120 it was much more attractive than a $300 replacement motor, a $600 VFD, or an $800 rotary phase converter. Now, I’m not so sure.
So, I’m back to square one, except that I now own an unusable Unisaw. I am currently looking into three options, all around $300 or less.
Option #1: Purchase the “Heavy-Duty” Static Phase Converter
Each option has its advantages and disadvantages. I suppose I could also build a phase converter, but I’m not really keen on having a 10HP idler motor sitting in my shop. That and it would probably be just as expensive as replacing the motor. My “perfect” solution? Find a working, used 5 HP Single Phase Input VFD for ~$100-$200. Odds of finding one: zero or close to it.
I’d appreciate anyone’s input on any of my options, or one I haven’t considered. The worst part? Explaining to my wife that this project is going over budget.
-- Dylan C ...Seems like all ever I make is sawdust...