compresser motor starter capacitor blowing

by Kipp
(Catskill , NY>)

5hp GE 1phase/220v compresser motor mtd on 80gal verticle tank with single stage vtwin pump.


Pump is recently new as is control switch/head bleed valve.

after 3yrs no problems , one of the capacitors blew, motor would not start.

replaced with same and blew imediatly. had motor serviced at electric motor shop. replaced capacitor and switch plate assbly. Ran great bfor two days, the n armeture fried completely( says same shop) sold me replacement motor, Marathon 21.0amp 220v .

Installed after checking bleed valve operation and pump operation. Ran fine for one week with part time use. motor will not start again , will hum but will not start under load, as did when cap went.

take belt off motor starts but draws 42 amps at start. pump turns over easily too.

with belt on, no start just hum and blow 20amp breaker.

Landlord has done some major construction and elecrical work on this building and next door facility too. but to my knowledge nothing to my elecrical box, everything in same place.

hard to believe its another motor oriented issue with brand new motor from very reputable shop, could some elecrical mis hap or such issue be the contributing cause to this repeated motor failure?

how do I check? what do I look for? Landlords elecrician cchecked box said its fine but hinted may be some problem with way landlord had service split recently, electrician mum about what was done.

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Jul 31, 2013
electrical
by: doug s.d.ca

They may have spit your 220 from differnt phases.
some devices care, others don't, so other stuff working doesn't mean it is right.

Happened at One Wilshire in Los Angeles once while I was there.
____________________
Thanks for the advice on this one, Doug. Appreciate it.

B.



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Motor dieing

by Ryan Allen
(Indianapolis, IN, USA)

My kobalt compressor motor starts as strong as usual then after 20 seconds dies to a stop. Been using the compressor on the same outlet for 2 years..new issue.

_______________________________
Bill says...

Hello Ryan. Sorry to hear that you're having trouble. It's hard to be sure with the info provided, but it sounds like the load in increasing to bring your motor to a stop.

Does the breaker pop or thermal overload pop when it stops?

The increasing load may just be the normal pressure build up that the motor can no longer overcome as the motor itself is failing. Or, it could be a mechanical issue loading the motor shaft to the point where the motor force cannot overcome it.

I'd guess the motor is going, and the fasted way to check is to take it to an electric motor rebuild shop in your area, have them test it, and if they find that the motor is going, they can probably rebuild or replace it, depending on which is lower cost.

Cheers,

Bill

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wiring up motor leads

by Courtney McManus
(Downtown St. Louis, MO)

I have a speedaire 5hp 3 phase counterclockwise 52045B2 motor on a speedaire need to know how to wire correctly. Thank you, Courtney McManus, Missouri Transformer and Switch.






Bill answers...

Hi Courtney...as with all Speedaire questions, please visit this page for Speedaire repair information. It will direct you to your closest repair depot if you follow the guidelines on the page.

Cheers,

Bill

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need a wiring diagram or pictorial diagram please

by richard
(Edmonds)

I have a 230 volt single phase 50 amp air compressor that I need to wire in.

The components consist of a pressure switch with an on off switch built in one only connections shows line and load the switch is rated for 25 amps ?

will this be ok I also have a starter then the motor that starts the air compressor the motor has a capacitor on it

I know I probably don't have to add the starter but nice feauture to have can you explain or send me a diagram on how to wire this in please and thank you

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Feb 11, 2014
starter
by: Doug in s.d.ca

Hmm.

Sounds like maybe the thing stared out as a 25A unit, then a bigger motor and possibly compressor added on.

The 25A pressure will probably work by itself (if only briefly), but is clearly under-rated, hence the starter.

Use the pressure switch to energise the starter, and run power to the starter contacts (which is just a heavy duty relay) on to the motor.

You may want to look up the specs on the starter, if it's not obvious what goes where.

HTH, and have fun.

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