Yesterday's air compressor score,

motofool33 · Oct 3, 2015

Been watching this ad on Craigslist for a couple weeks. And went to go buy yesterday got em talked down to 600$

370 quincy 10hp 3 phase 480

Now I'll be changing it over to single phase in time.

Anyways here's some pics

And one of me showing this thing is almost taller then me

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pcmeiners · Oct 3, 2015

Really nice score, looks in decent condition, in NYC area you never get something like this, at near your price. You definite get a You **** on this

motofool33 · Oct 3, 2015

Thx, he wanted 700$ I tried hard for 450$ but he wasn't having it lol

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theoldwizard1 · Oct 3, 2015

It is going to be hard to find a 1P 10hp motor. I would look for a 5HP and swap the pulleys. Yes, less air (cfm) but that thing looks like a beast !

930dreamer · Oct 3, 2015

Did you see the compressor operate before you bought it? If I had that compressor I'd look at a 7.5hp 3 phase motor and a rotary phase converter.

motofool33 · Oct 3, 2015

He said I could hook it up it worked, but no I did not see it run

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motofool33 · Oct 3, 2015

I found a 10hp single phase motor locally for 500$ I just have to verify it's the right rpm first

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motofool33 · Oct 3, 2015

Looking at the motor it looks like it might be dual voltage can anyone she'd some light on the 230 volt YY configuration?

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Murphy4570 · Oct 3, 2015

motofool33 said:
Looking at the motor it looks like it might be dual voltage can anyone she'd some light on the 230 volt YY configuration?

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A lot of industrial 3 phase stuff can be wired to use either 208/230 or 460/480 input voltage. Doesn't really help you any, unless you have 3 phase wired in your shop.

motofool33 · Oct 4, 2015

Murphy4570 said:
A lot of industrial 3 phase stuff can be wired to use either 208/230 or 460/480 input voltage. Doesn't really help you any, unless you have 3 phase wired in your shop.

thanks i figured thats what it was,

So i found a locally a new lincoln 10hp single phase motor but its 3480rpm, and he motor i currently have is 1750rpm.

where would u guys look for a new pulley to change the output speed?

930dreamer · Oct 4, 2015

Try MSC or Grainger's for a pulley. Will this compressor be used in a home garage or a shop?

motofool33 · Oct 4, 2015

its going to be at my garage condo, voltage i have is 240volt single phase.

930dreamer · Oct 4, 2015

motofool33 said:
its going to be at my garage condo, voltage i have is 240volt single phase.

What's the amp draw on the 10 hp single phase motor? Do you have a 50 amp circuit available for the compressor?

PS, love the older Quincy pumps.

zkling · Oct 4, 2015

You probably won't get the proper belt wrap due the the large difference in pulley diameter for a the ctc distance allowed by the mounting plate.

Congrats on the pump, I'm running a 270 (single stage variant) and lucked into the single phase motor for it.

motofool33 · Oct 4, 2015

930dreamer said:
What's the amp draw on the 10 hp single phase motor? Do you have a 50 amp circuit available for the compressor?

PS, love the older Quincy pumps.

yes i have a 50amp circuit that my 5hp is plugging into right now, that one is plugged in by a 3prog dryer outlet style . but on this 10hp id like to wire it in direct. and through a disconnect and need to find out if i can use the 3 phase magnetic starter or not.

compressor location is only 2-3ft from panel

the current motor on the compressor is 25 (230volt)/ 12.5(460v) amp from the tag on it.

the 10hp single phase motor on ebay i found new is 40amp draw.

zkling · Oct 4, 2015

motofool33 said:
yes i have a 50amp circuit that my 5hp is plugging into right now, that one is plugged in by a 3prog dryer outlet style . but on this 10hp id like to wire it in direct. and through a disconnect and need to find out if i can use the 3 phase magnetic starter or not.

compressor location is only 2-3ft from panel

the current motor on the compressor is 25 (230volt)/ 12.5(460v) amp from the tag on it.

the 10hp single phase motor on ebay i found new is 40amp draw.

That's running, startup amps, especially on a compressor although the unloaders help, is quite a bit higher than running amps on the data plate. My 7.5 is on a 60 or 70amp breaker IIRC. :headscrat

:

motofool33 · Oct 4, 2015

zkling said:
That's running, startup amps, especially on a compressor although the unloaders help, is quite a bit higher than running amps on the data plate. My 7.5 is on a 60 or 70amp breaker IIRC. :

im sure i have room to put a bigger breaker in the panel it has a 200amp panel and i only have 1 50 amp circuit besides the air compressor, rest are lights and outlets

motofool33 · Oct 4, 2015

what would the downside be of hooking up a 7.5hp single phase weg motor that has the same rpm as the current motor?

less output from the compressor?

zkling · Oct 4, 2015

Yes, to get more flow out of the compressor, you have to increase the RPM, to be able to increase the RPM you need more power in the motor. Call quincy and ask them to send you a performance sheet on the 370, it will list RPM vs HP vs output.

930dreamer · Oct 4, 2015

motofool33 said:
what would the downside be of hooking up a 7.5hp single phase weg motor that has the same rpm as the current motor?

less output from the compressor?

The motor range for that compressor was probably 7.5-10hp, so less cfm. You don't want a 3480 rpm motor, it will be a nice chug chug with a 1750 rpm motor.

http://www.compressorworld.com/quin...air-compressor-pump.html#sthash.i9YC8Qc2.dpbs

motofool33 · Oct 4, 2015

i found two new motors locally, one is a 10hp 3480-rpm, the other is a 7.5hp 1750rpm.

i dont need the 50cfm this thing will put out.

spec sheet added, 7.5-15hp range for this compressor

motofool33 · Oct 6, 2015

updating some info, for pulley measurements
Small Pulley
shaft Diameter 1 3/8"
OD 9 3/4"
ID 8"
Width 2.5"

Large Pulley
Shaft diameter 1 5/8"
OD 19 1/2"
ID 17 1/4"
3 3/4" width

Pump Model 370, 104
Serial 386895
3.25x6x4

So i spoke to someone that sells compressor motors and hes telling me i need to feed a 10hp motor with a 225amp service panel and a 100amp breaker. and use 0AWG Wire for the motor.

does this sound right?>

zkling · Oct 6, 2015

If your measurements are correct and consistent between the two pullies, you are turning that pump at it's top end of ~865 RPM with a 1725 motor. Most of the QR series are 400-900 rpm max pumps. I think mine is in the 750 range. :headscrat

: Did you get a curve from quincy on it?

As for the motor, that sounds a bit generous but not way out of line. I'd call an application guy at Baldor or the like and ask them what to expect. Different purpose motors have different start characteristics.

454ragtop · Oct 6, 2015

I'd use the 7.5 HP and put a smaller pulley on the motor. How many sheaves on the pulleys? If 2, might try here http://www.surpluscenter.com/Power-Transmission/Pulleys/ for a pulley.
Jim

theoldwizard1 · Oct 6, 2015

motofool33 said:
compressor location is only 2-3ft from panel

That close to the panel, a disconnect it not required. I don't think a mag starter is required either.

motofool33 · Oct 6, 2015

Haven't got through to quincy, yet 3 belts on the pulley. I am contemplating a 7.5hp motor as I don't need 10hp

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MacMcMacmac · Oct 6, 2015

A mag starter is most definitely required for a 10hp 230V single phase motor. A quite beefy one at that.

Charles (in GA) · Oct 6, 2015

theoldwizard1 said:
That close to the panel, a disconnect it not required. I don't think a mag starter is required either.

A magnetic starter would be an absolute must on a 7½ hp or 10 hp motor. Those motors are not going to have internal thermal protection, and there isn't a pressure switch made that will carry the full load of the motor (well, I'm sure there is one somewhere but it would be stupid to try and use something like that)

Charles

motofool33 · Oct 7, 2015

Called quincy,

hes also going to tell me the parts i need to run it at LVD for sand blasting (continuous use), basically it will freewheel once compressor reaches full pressure, and draw barely any amps. but as soon as pressure drops the valves close and it pumps up. less wear and tear starting and stopping.

567rpms for 7.5hp motor
567 x 19.5 / 1750rpms = 6.318" pulley
puts out 26.3cfm at 175psi for 7.5hp
they use WEG motors and found one locally for under 300$

676rpm is 10hp speed

motofool33 · Oct 8, 2015

So also figured out the pump pulley uses B style belts, and ive been looking at pulleys to use:
http://www.electricmotorwarehouse.c...ng-not-included-3b60-sd/#sthash.lfqJTjlv.dpbs

and this bushing to mate it to a 1 3/8" shaft
http://www.electricmotorwarehouse.c...son-power-drive-sheaves/#sthash.1Fx5xA7P.dpbs

motofool33 · Oct 9, 2015

Picked up a 7.5hp WEG single phase motor yesterday, new never been hooked up.

tested it out on site and spun up to speed nice n quiet,

not bad for 250$, now i just need a pulley and a reasonably priced mag starter.

redmondjp · Oct 9, 2015

motofool33 said:
Picked up a 7.5hp WEG single phase motor yesterday, new never been hooked up.

tested it out on site and spun up to speed nice n quiet,

not bad for 250$, now i just need a pulley and a reasonably priced mag starter.

Great! But good luck on finding a "reasonably-priced" starter for that size motor. You're going to need a NEMA Size 2 starter at your voltage. If you get a used starter, check the coil voltage on the contactor - you're going to want 208-240V, although you could pull a neutral to the unit and go with a 120VAC coil as well.

motofool33 · Oct 9, 2015

redmondjp said:
Great! But good luck on finding a "reasonably-priced" starter for that size motor. You're going to need a NEMA Size 2 starter at your voltage. If you get a used starter, check the coil voltage on the contactor - you're going to want 208-240V, although you could pull a neutral to the unit and go with a 120VAC coil as well.

been doing some reading, what does size 2 mean?

i forgot today to see what the amps listed on the motor plate are, but as long as its rated for single phase, and amp range covers what the motor puts out, and its designed for 7.5hp what else is there?

here is one im looking at i like the fact that they test them in alabama
http://www.ebay.com/itm/Elimia-ACMS...Nema-4X-NEW-/131310375122?hash=item1e92b550d2

this one doesn't look as good as the above version
http://www.ebay.com/itm/7-5-HP-Sing...Control-New-/280715831577?hash=item415bf7a919

redmondjp · Oct 10, 2015

motofool33 said:
been doing some reading, what does size 2 mean?

i forgot today to see what the amps listed on the motor plate are, but as long as its rated for single phase, and amp range covers what the motor puts out, and its designed for 7.5hp what else is there?

here is one im looking at i like the fact that they test them in alabama
http://www.ebay.com/itm/Elimia-ACMS...Nema-4X-NEW-/131310375122?hash=item1e92b550d2

this one doesn't look as good as the above version
http://www.ebay.com/itm/7-5-HP-Sing...Control-New-/280715831577?hash=item415bf7a919

Nope. That first starter is too small! Yes, it will work for a 7.5HP 3 PHASE motor (contactor rated for 28 amps full load amperage), which has lower current than a single-phase 7.5HP motor (35-36 FLA).

The second starter is rated to handle your single-phase motor. Both of the above-linked ones look to be an IEC (European specification) starter as opposed to a NEMA (US spec) starter which is a lot more beefier (and a lot more expensive). Lots of opinions on this and the topic has been covered here so you can search for more info. I have a Square-D NEMA size 2 starter right now (came with a motor that I haven't figured out what to do with yet), and the thing is huge.

motofool33 · Oct 13, 2015

Here's the motor I picked up for 250$

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CNGsaves · Oct 13, 2015

^ ^ That appears to be nice score on the compressor motor for $250 . . . :thumbup:

. . . . . here's better view of motor plate for Sparky's to view.

motofool33 · Oct 13, 2015

CNGsaves said:
^ ^ That appears to be nice score on the compressor motor for $250 . . .
. . . . . here's better view of motor plate for Sparky's to view.

ordered a pulley today 567rpms x 19.5" / 1730 equals a 6.39" OD pulley found a 6.35" pulley and spacer got it coming from electric motor warehouse for 60$ something dollars shipped.

called elimnia in alabama about motor starters waiting for a call back.

tool_scrounge · Oct 14, 2015

There is a lot of counterfeit new stuff on Ebay. I would fine a new old stock or lightly used starter if possible.

redmondjp · Oct 14, 2015

tool_scrounge said:
There is a lot of counterfeit new stuff on Ebay. I would fine a new old stock or lightly used starter if possible.

OK, I know what you are trying to say here, but it's now very hard to define counterfeit when everything is made in China in the first place!

The bigger issue here, is NEMA vs. IEC. The NEMA starters are the bigger, heavier ones. The IEC ones (European spec) are lighter-duty, and many "copies" of the major European manufacturers' IEC starters do now show up on Ebay and other web stores. That doesn't mean that they don't work, but I'm with you - I would much rather have a NEMA motor starter any day over an IEC one.

If you do get an IEC starter, get one that has more ampacity than you need - as high as possible, but just watch that the overload setting will go down low enough to safely protect the motor.

But I'd still rather have a Chinese-made IEC starter over no starter at all!
I'd say that a high percentage of the compressors I come across that should have a starter, don't ("hey, it runs, what's the problem?").

motofool33 · Oct 19, 2015

If I read this correctly, this starter is rated for 40fla, at 240volt single phase 7.5hp. So this means I can use this starter?

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