Air compressor advice

[The Tool Tyrant]

Well I did that , but apparently that's just a contactor , a cheaper version , the better version is $200 more than this but that version has overload relay protection which this cheaper version does not . He said this will work , but my question is will this version do more harm to the motor if something goes wrong ?


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Here is an option...all ready to go...http://www.ebay.com/itm/Eaton-10-HP...212282&hash=item3d2a367563:g:LHMAAOSw5cNYEomN

 

[thinktwicez71]

You know .....that's the one I was looking at , but I tried local and am regretting it , I'm going to return this one tommorow and order that one . I would have him order it but I feel it would be 100 more expensive for the same thing


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[American Locomotive]

The contactor would work, but wouldn't provide motor protection. Given that the 10HP single phase motor is probably a pretty large investment, I'd want motor protection.

 

[thinktwicez71]

The contactor would work, but wouldn't provide motor protection. Given that the 10HP single phase motor is probably a pretty large investment, I'd want motor protection.

I agree , it wasn't cheap

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[thinktwicez71]

Well the compressor getting done just hit a snag for a while ...... tore my gastrocnemius (calf) muscle Thursday night in slowpitch solftball league. Im in a cast till my MRI appt and non weight bearing for about a month he said , it's no fun getting around on crutches and I'm confined to a damn chair all day in agony.

One question I do have on the compressor is do I need a disconnect box along with the motor starter , or can I hard wire it to the breaker box and use the breaker for on/ off . How expensive are the on off disconnect boxes ?


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[The Tool Tyrant]

Well THAT *****! Funny how most injuries happen away from work rather than on the job!

A disconnect switch is more a 'Safety Switch' than anything. Being as you're using the compressor in your own garage, don't worry about it. If it was in a business and you couldn't see the breaker from the compressor (and I believe there is also a maximum distance to the breaker) it would be required. It's basically so you could disconnect power while working or servicing the compressor without concern of someone flipping the breaker on.

 

[thinktwicez71]

Can somebody give me some advice help on how to wire this motor starter ? I got 2 wires coming from the low oil cutoff , 2 wires coming from the pressure switch. I know the 2 wires that feed power to it go in at the top to the litter poles , what about power from the starter to the motor ? Thanks

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[thinktwicez71]

Going stir crazy with this calf muscle tear , off my left leg 8 more weeks , thank God for a garage chair and time . I can at least sit in here and wire this

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[American Locomotive]

Is the low oil cutoff normally open, or normally closed?

 

[thinktwicez71]

Boy I honestly don't know , it's a Saylor beall 4500 , how do I find this out ?

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[thinktwicez71]

Here is low oil cover plate

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[thinktwicez71]

I got it the motor on and all wired up for the motor starter . I temporarily wired it to fire it up and see how it runs . Runs great , pressure switch has it shutting off at 120psi. I left it pressurized and came out 2 days later and Its on 20 psi. It has an unloader plumbed with a valve on it I'm wondering if should be closed. It was left open and I'm wondering if that's why it was almost empty. The valve I'm talking about is below the unloader on the pump end of compressor near the pressure guage, thanks

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[The Tool Tyrant]

It's set -up to be a 'duel run' unit. If the valve is open to the pilot valve, then it will be on 'constant run' which opens the unloaders so the pump is not compressing air, but continues to run. You would use that feature if you were in a high air demand situation, so the motor isn't constantly starting and stopping. Close the valve and it directs the air to the pressure switch, so you're back on a 'start-stop' condition.
As many CFM as that pump produces, you'll most likely never need to use the 'constant-run' option.

BTW, the pressure switch must be set at approximately 8-10 psi higher than the pilot valve cut-out pressure. When you switch from constant-run to start-stop (auto) the receiver pressure will drop around 25 psi below the cut-out pressure before the start-stop (auto) control takes over.

 

[thinktwicez71]

It's set -up to be a 'duel run' unit. If the valve is open to the pilot valve, then it will be on 'constant run' which opens the unloaders so the pump is not compressing air, but continues to run. You would use that feature if you were in a high air demand situation, so the motor isn't constantly starting and stopping. Close the valve and it directs the air to the pressure switch, so you're back on a 'start-stop' condition.
As many CFM as that pump produces, you'll most likely never need to use the 'constant-run' option.

Ok thank you


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[thinktwicez71]

Even with the valve open the compressor and motor stops at 120 tho , so Maybee it's not adjusted right for it ? Regardless I'm going to use it in valve closed and in start stop mode


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[The Tool Tyrant]

That would be the pressure switch. It's either is the wrong switch or it need to be adjusted.
Check youtube as they're video's showing how to correctly adjust it.

 

[thinktwicez71]

That would be the pressure switch. It's either is the wrong switch or it need to be adjusted.
Check youtube as they're video's showing how to correctly adjust it.

Must need to be adjusted some , I checked it today and it's a brand new pressure switch that is supposed to be 175 off 145 on .

I don't need 175 psi of air I'll prolly set it at 140-150 psi and then hook up a shop Filter Regulator Luber. There will be no shortage of air with this compressor , it's way bigger than I'll ever need but was way to good of a deal to pass up


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[The Tool Tyrant]

Check the gage for accuracy. A brand new pressure switch should be pre-set...I've never had to re-adjust a brand new switch.

 

[thinktwicez71]

Check the gage for accuracy. A brand new pressure switch should be pre-set...I've never had to re-adjust a brand new switch.

I haven't gotten to testing it , but what I should of said was the previous owner bought this new pressure switch before I bought this compressor and ran it for 2 months , so who knows he might of adjusted it . He had a large machine shop and lots of lathes , the air powered the chucks on the lathes , might not of needed more than 120psi

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[The Tool Tyrant]

I haven't gotten to testing it , but what I should of said was the previous owner bought this new pressure switch before I bought this compressor and ran it for 2 months , so who knows he might of adjusted it . He had a large machine shop and lots of lathes , the air powered the chucks on the lathes , might not of needed more than 120psi

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Here is the YOUTUBE link showing how to adjust it....