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  1. US Motors/Emerson AE20Y 7.5HP - appropriate for compressor?

    Hi all,

    I am looking for a couple of 3ph 7.5HP motors for use on my Quincy QR-350 compressor pumps. I was wondering if the following motor is suitable for compressor usage:
    264872

    The specs...
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    Thanks for the clarification. I will do...

    Thanks for the clarification. I will do something similar in terms of the solenoid, once I figure out exactly what approach I am going to take.


    I appreciate all the comments/suggestions. I'll...
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    Thanks for the clarification. By...

    Thanks for the clarification.




    By mechanical system, are you referring to only the hydraulic (oil pressure) unloader or the whole valve? Are you running start/stop?

    I was wondering how...
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    They are Quincy QR-350s, with an RPM range of...

    They are Quincy QR-350s, with an RPM range of 400-940. Oil pressure-lubed. The 5HP runs at 400RPM, I wouldn't want to slow below that, I was thinking if I were running at higher RPM with a larger...
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    My expectation is that I will run both motors...

    My expectation is that I will run both motors together nearly all the time and not worry about staggering or alternately starting the motors. In my anticipated usage I expect most often to run it...
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    VFD for duplex compressor

    Hi all,

    I have a duplex compressor with two 5hp 3phase motors on it. The compressor can support both continuous run (head unloaders) or start/stop operation. I have single phase input.

    Is...
  7. Thanks, I was aware of this and will do that if I...

    Thanks, I was aware of this and will do that if I end up with a large RPC. That said, for my compressor application I am starting to think that a VFD might be the way to go.

    Don
  8. I heard back from the RPC manufacture who uses...

    I heard back from the RPC manufacture who uses custom idlers. The startup current for the 20HP soft start is 100 amps. I believe this is on the order of 50% (I'm thinking startup is 4x FLA?).
    ...
  9. This is generally what I thought, I just need to...

    This is generally what I thought, I just need to deal with my wife on this...




    This is very comforting...;)


    I looked into those, but I like the flexibility of an RPC. If it were my only...
  10. RPC, 7.5HP in rush current and the big green box in my yard

    Hi all,

    I am spec'ing out what I would like to do with an RPC, and I'm hoping for some general guidance here regarding the start up amperage from a duplex compressor with 7.5HP 3-phase motors and...
  11. Thanks for the confirmation; parts are on the way.

    Thanks for the confirmation; parts are on the way.
  12. Check. Making progress and getting clarity...but...

    Check. Making progress and getting clarity...but wondering...



    Regarding sizing the contactor and overload/heaters - I'm thinking that I may want to upgrade the motors to 7.5HP someday, so is...
  13. Sounds like I'm on track. Thanks, I will update...

    Sounds like I'm on track. Thanks, I will update once I get to focus on getting it up and running.
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    I know this is an old thread, I've been reading...

    I know this is an old thread, I've been reading like crazy, but something I haven't been able to determine is related to the design below:




    Does this design (common bus) allow you to create a...
  15. Hi Froneck, I'm not completely clear on what...

    Hi Froneck,

    I'm not completely clear on what you are saying regarding the ground/neutral wires (but I'm thinking it isn't a concern), here is the transformer: 263683

    There are two wires from...
  16. I hope so, although I may upgrade to 7.5 hp so...

    I hope so, although I may upgrade to 7.5 hp so maybe only 80 years. I am aiming to run a utility hammer which calls for about [email protected], but I don't know how duty cycle plays in. The twin 5s will...
  17. Hi all, Thanks for the great information. I...

    Hi all,

    Thanks for the great information. I feel like I have a good fighting chance to get this thing going.

    That said, she is going to be sitting on the trailer for a while until I am able to...
  18. I had a bit of a further look at this and looked...

    I had a bit of a further look at this and looked up the parts. I believe that the Cutler-Hammer contactor CE15BNS3 is rated for only 2HP at 230 Volts, so I'm thinking that would need to be replaced....
  19. Yes, they are 350s. It looks like an F350 =...

    Yes, they are 350s. It looks like an F350 = single QR-350 pump, FF350 = duplex QR-350 pumps.
  20. Yes, motors are labeled 230/460 but the wires...

    Yes, motors are labeled 230/460 but the wires feeding them are 14g, so that tells me 460.

    I'm just wondering about the controller. Maybe I don't need the lead /lag but the pressure switch...
  21. So I am now the proud owner of an...

    So I am now the proud owner of an FF350:263340from 1998. It has two 5HP motors and 18k - 20k hours/pump. So that is the good news. The (possibly) bad news is that the control panel is configured...
  22. Planning on picking the monstrosity tomorrow. ...

    Planning on picking the monstrosity tomorrow.

    Does anyone have a chart for pulley size versus CFM at various pressures? Or one other pressure, I'm wondering what sort of CFM I might get at 125PSI...
  23. I really like the idea of the low RPMS, 400 seems...

    I really like the idea of the low RPMS, 400 seems really slow.

    That said, I was surprised to see that at 5hp it puts out 3cfm less than a 325. Good to have the option to up-motor in the future.
    ...
  24. Quincy Compressor 350 Pump - how many hours are too many?

    Hi all,
    I'm considering buying a mid-90's Quincy with a 350 pump. This is pressure lubed.

    The reported hours are 12000. I know I wouldn't want to run for 12000 hours, but can someone provide...
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    So the thinking is that if the compressors are...

    So the thinking is that if the compressors are going to be cycling frequently then it might be better to just leave them running during period of heavy usage, to avoid the frequent startups and...
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