Rand Air Compressor



Rand Air
How do you find out about electric motor run capacitor sizing?

I have a electric motor that wont run, I'ts an Emerson Electric CSCR type, 120 Volt , 3 hp, 3450 rpm, 1 phase. The microfarad (mf) has rubbed off the original capacitor and I dont know how to size a replacment. It is an Ingersol Rand T10 , but they want to sell me a new motor at $700.00, which I know I don't need. I can get a new Capacitor for about $20.00 I work in the HVAC industry so I have experience with electric motors. The start and run winding resistance is good, not shorted to the case, and the start capacitor checks out ok. I emailed Emerson Electric (the maker of the motor) but got no responce. There must be a formula to determine the capacitor sizing. Thanks, ED

There are 2 ways to go about this, the first, use a capacitor that is the same size as the start capacitor. The other, go to a shop that specializes in electric motor repair and ask them. You might see if a business like Granger's would allow you to remove the covers from a comparable motor and get the values from that. Emerson wants you to buy, obviously, but like a lot of us, you just want to repair, which is good.


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