Ok, I bought a big-ass Devilbiss compressor to replace the anemic 8 gallon one I have........problem is, there is no manual with it, and I'm not sure how to wire this pig into my shop........

1993 Devilbiss 80 gallon, 5 hp compressor. Has a Baldor L1410T motor. Some of the motor specs are as follows........
Frame: 184T
HP: 5
RPM: 1725
Volts: 208-230
Amps:26.3-25
Ph: 1
Hz 60

There are two sets of wires coming from this compressor, one set, a black, white and bare wire from the motor itself, and another similar set of black, white and bare [ smaller guage than the motor wires ] coming from a ?pressure switch.

Does the motor take 220v? Can I just wire a 220v welding plug on to these wires and use my 220v mig welding recepticle?

What about the wires coming from the ?pressure switch, does it get hard-wired into the breaker box 110v? [ or plugged into a 110v recepticle?]
The pressure switch [ Furnas MA9432 ] is mounted on some pipe that comes out of the side of the tank. There is also a dial pressure guage on this pipe. The smaller guage wires come from this switch. These two sets of wires [ motor and p. switch ] are all the same length, so previously, they must have all gone into a remote elctrical box of some kind and then to the panel ]?

Also labeled on the motor......"motor not protected - external protection shall be provided in compliance with C.E. code, part 1" OK, so what does this mean? Protected from what, heat? overload? DoI need to purchase / install some part?

The existing welding recepticle is on a circut breaker of it's own.........thought I might add that.



When it comes to wiring in equipment.......I'm at a loss.
Thanks for the tips.

Just wired similar set up the other day...

1st, what size wires are coming out of the motor? Are they large enough for the amperage listed on the motor? If so... I'd suggest replacing the "other" set of wires with a set the same gauge as your motor wires as they will be seeing the same load... You'll want a new set long enough to get to the female plug listed below...

It is a 220V motor and needs such power supply.
I'd suggest a dedicated circuit for the air compressor, it should not need the amperage that your welder does and should be sized accordingly (30amp breaker as apposed to a 50+ for your welder) This will also save you the hassle of switching plugs out all the time...

Overview of the wiring...
Breaker to female plug
Male plug to the pressure switch
Pressure switch to the motor

The pressure switch turns the motor on and off according to what it is set. This regulates the pressure in the tank.. Hard wiring the motor to an outlet will require you to turn the motor on/off to pump up the tank... Thus making the pressure switch useless..

Follow the colors throughout the wiring and keep them the same..
Black and white are both powers and the bare wire is the ground..

Should look similar to this..
(this is a 4 wire setup on a well pump, but just eliminate the red wires and replace them with white..)
http://www.catskillhouse.us/blog/wp-content/uploads/2007/12/well-pump-pressure-switch-wiring.jpg


edit: does your pressure switch have a manual on/off switch on it?
If not is the pressure switch turned on/off electrically? This could be the smaller wires if they are to control the pressure switch function only. Which would mean you are entirely missing the wires for the power supply from your outlet to the pressure switch...

You both should have a magnetic starter on your compressors. Motors of 3-5 hp and up should have them. The reason is your pressure switches are handling the entire load of the motor starting current which can be upwards of 80 amps. If you use the pressure switch to control the coil of the mag starter it will put the start current in the mag which is designed to take it.

Other then that it looks like you guys have it figured out.

Edit: You asked about the protection, you motor doesnt have any overload protection. This can either be provided with the appropriate breaker size or in a mag starter. Its recomended to do both.

Yes, I do require a magnetic starter for the motor. I just got off the phone with the Devilbiss rep.......

Just need to figure out which mag starter I need.

Thanks for the posts and tips!

Link:

http://www.pirate4x4.com/forum/showthread.php?t=665190&highlight=

FWIW: They make some pressure switches that can handle up to a 5hp motor so you don't ALWAYS need a magnetic starter.

And 80amps... I don't think so.

FWIW: They make some pressure switches that can handle up to a 5hp motor so you don't ALWAYS need a magnetic starter.

And 80amps... I don't think so.

Yeah they do make some that are rated for a 5 hp motor, that doesnt mean they will last for shit.

Yeah 80 amps, im not makin this up. I work on these L1410Ts on a regular basis, starting them with NO LOAD they will get above 80 amps. Now put a load on them, whats that going to do? It is only when the motor is in the start circuit which is a split second but they do it.


EDIT: proof for the uninformed. "START CURRENT 140 AMPS"
http://www.baldor.com/products/perfdata.asp?1=1&catalog=L1410T&product=AC+Motors&family=General+Purpose%7Cvw_ACMotors_GeneralPurpos e

Yeah they do make some that are rated for a 5 hp motor, that doesnt mean they will last for shit.


Really? Mine just died on my compressor, it's approx 10yrs old, it was a lose wire that caused it.
I have a magnetic starter, and new pressure switch, but it sure lasted 10 years... that's not 'for shit' to me.

Yeah 80 amps, im not makin this up. I work on these L1410Ts on a regular basis, starting them with NO LOAD they will get above 80 amps. Now put a load on them, whats that going to do? It is only when the motor is in the start circuit which is a split second but they do it.


EDIT: proof for the uninformed. "START CURRENT 140 AMPS"
http://www.baldor.com/products/perfdata.asp?1=1&catalog=L1410T&product=AC+Motors&family=General+Purpose%7Cvw_ACMotors_GeneralPurpos e

Why do we care if the motor requires 2562966 amps to start? It doesn't draw that from the power source directly.. if you work on these you should know this. :shaking:



If you can supply 25amps you will be fine with a 5hp motor.

Mind telling me where that 140 amps is coming from? Its passing through your pressure switch if you dont have a mag. What size motor do you have? Oh and just for giggles how much did you pay for your new "5 Hp rated pressure switch"?

Mind telling me where that 140 amps is coming from? Its passing through your pressure switch if you dont have a mag. What size motor do you have? Oh and just for giggles how much did you pay for your new "5 Hp rated pressure switch"?

140 amps does NOT pass through your pressure switch...... Capacitor.

Re-Read what I said. :shaking: I never said I purchased a new 5hp rated pressure switch, I said I had one prior that lasted 10 years :shaking: I replaced it with a magnetic starter, and a new pressure switch (not a 5hp one). You can get the 5hp rated pressure switches on ebay for ~60 for a name brand I believe too. Cheaper than a magnetic starter + Pressure switch...

140 amps does NOT pass through your pressure switch...... Capacitor.

Re-Read what I said. :shaking: I never said I purchased a new 5hp rated pressure switch, I said I had one prior that lasted 10 years :shaking: I replaced it with a magnetic starter, and a new pressure switch (not a 5hp one). You can get the 5hp rated pressure switches on ebay for ~60 for a name brand I believe too. Cheaper than a magnetic starter + Pressure switch...

I assure you todd that amperage is line current of that motor when its starting under a 5 hp load. Why would they tell you the amperage of an internal component of the motor? If you dont believe me feel free to go put an amp meter on your lines at the mag while the compressor starts. Make sure you set your meter on the "peak hold" setting so you can stare baffled at the reading it gives you.

Your normally a very knowligible person and i have actually learned a few things from you in the past. However you are wrong on this one. Don't worry thou its ok to be wrong once in awile. :flipoff2:

I assure you todd that amperage is line current of that motor when its starting under a 5 hp load. Why would they tell you the amperage of an internal component of the motor? If you dont believe me feel free to go put an amp meter on your lines at the mag while the compressor starts. Make sure you set your meter on the "peak hold" setting so you can stare baffled at the reading it gives you.

Your normally a very knowligible person and i have actually learned a few things from you in the past. However you are wrong on this one. Don't worry thou its ok to be wrong once in awile. :flipoff2:

So you are saying the 140amps isn't drawn from the capacitors yet goes to the mag or pressure switch (Depending on setup) ?

My understanding of the tech docs and how the motor works was yeah, it can draw the power you say (and the docs say, not doubting you) but not from the source directly, instead the capacitors are used to absorb that initial hit since they have the power available.

I will stick a meter on her next time I use it and report back... even if my tail is between my legs :D
Oh, and it's not gonna be tomorrow or in a week since I`m moving but don't think that since I don't reply I`ve given up :flipoff2:

The 140 amps is drawn by the starting circuit of the motor (capacitors, stationary switch, centrifugal switch, and start winding), so yeah it does go through the start caps too. The start caps are basically there to increase the starting torque of the motor.

As for the rest of it.................fare enough!

BTW: I test ran a 1 hp motor on the bench today, it pegged the 50 amp meter. That was a brand new motor with no load on 115 volts.