Posted by Harvesterguy on June 27, 2008 at 07:26:07 from (128.175.252.176):
In Reply to: VFD posted by CBBC on June 26, 2008 at 12:21:22:
I am currently running a Yaskawa VFD on a 35hp turbine pump. I paid $3,500 about 3 years ago and it was the cheapest I could find that had all of the features I needed. The soft start definitely can reduce/eliminate the water hammer, but for me the ability to hook a pressure transducer was the selling point. The center pivot this pump is connected to is a research machine in which we are continually turning sections on and off. With the pressure transducer control I just set the operating pressure desired and the VFD will change the pump speed to maintain that regardless of flow rate. I have had very good luck with the tech support at Yaskawa and have purchased a smaller 10hp version for my trickle pump.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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