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Ingersol Rand Compressor (How to hook up?)


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  #21  
Old 08-29-2012, 11:15:10 PM
930dreamer 930dreamer is offline
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Default Re: Ingersol Rand Compressor (How to hook up?)

Any updates on the wiring?
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  #22  
Old 08-30-2012, 12:32:11 AM
len k len k is online now
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Default Re: Ingersol Rand Compressor (How to hook up?)

Mike G .... VFD that sounds like about the best idea yet... technically.
It has the ability to make 3 phase. They should be able to size it up for larger hp sizes.

Now price......they might not be that cheap, call arround. Maybe used ?? Then again maybe a used single phase motor.

---------- Post added at 12:32 AM ---------- Previous post was at 12:18 AM ----------

Another thought ..... if you have a motor protector on it now , it may not like the VFD input. I assume there are mechancial and electrical versions of protectors. I suspect the electrical versions won't like the VFD input. A VFD varies voltage and frequency. And they output square wave like voltage instead of sinewaves.

I think motor protectors are setup so they can mimmick temp rise in the motor windings and shut off the motor before it gets too hot.
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  #23  
Old 08-30-2012, 09:21:42 PM
Mike G Mike G is offline
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Default Re: Ingersol Rand Compressor (How to hook up?)

len k,

I agree that a VFD could be over kill for an air compressor that will run at 60 Hz anyway. The VFD would offer added speed control for something like a machine tool.

With a VFD, an overload relay is not required. The drive will be configured with information about the motor it is operating, and therefore can provide much better protection than a simple thermal overload relay. You still need to have over-current protection for the wiring, a disconnect (before VFD) and preferably a way to lock out the disconnect.

Keep in mind that single phase motor of the same horsepower rating is most likely going to be physically larger.

Also found the following links to be interesting:

http://www.phaseconverterinfo.com/ph...verter_vfd.htm

http://www.phaseconverterinfo.com/ph...er_digital.htm

Mike
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