From: noone@nospam.com   
      
   Στις 1/8/2022 11:18 μ.μ., ο/η gfretwell@aol.com έγραψε:   
   > On Mon, 01 Aug 2022 19:01:35 +0000, Pasieka   
   > <1e8dbacd6cbe854c1c2e33544319180f@example.com> wrote:   
   >   
   >> BEll curve...That's is a useful insight thank you... wanted to get some   
   data logging current meters and rpm meters to work together so I can plot and   
   get a better idea of iterative capacity values and performance / operational   
   chacteristics.. was    
   going to do the pump as a load without building pressure until I get closer to   
   what I am hoping the correct value will be... thinking back emf voltage on the   
   capacitor would also be relavent but do not know what to expect... maybe I   
   will collect data on    
   another working compressor with a 3 hp motor i have access too and know the   
   original capacitor values of and then start working on the 5 hp..... any   
   advice is appreciated... need to get a student copy of labview and get my   
   daughter to install it... it's    
   been years.. wonder if I will remember how to do the DAta acquisition... and I   
   my old NI USB-6008 can still be used or if it's to old for current support....   
   >   
   > I was playing with my 3HP compressor in a similar situation. The run   
   > cap burnt beyond recognition. I had a box of capacitors and used the   
   > trial and error method to pick a size based on current draw at about   
   > half the rated pressure., That seems to be when it actually draws the   
   > most. As the pressure starts reaching max the current actually drops   
   > because you are moving less air and doing less work. That is similar   
   > to why a vacuum cleaner actually speeds up when you block the air   
   > flow.   
   > I started around 40 MFD as I recall and ended up at 50.   
   google is your friend.   
      
   https://air-compressor-help.com/how-to-size-a-run-capacitor-for-air-compressor/   
   https://www.google.com/search?q=how+to+calculate+run+capacitor+s   
   ze+for+a+compressor&rlz=1C1GIWA_enGR882GR882&oq=how+to+calculate   
   &aqs=chrome.2.69i57j0i512j69i59j0i512l7.15053j0j7&sourceid=chrome&ie=UTF-8   
      
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