Magna Force compressor blew a capacitor

by Dave Johnson
(Centralia, IL U.S.)

Tried to run 220 volt compressor powered by 6000 watt generator, 240 volt receptacle rated at 20 amps, and compressor blew a capacitor. What could cause this?

Comments for Magna Force compressor blew a capacitor

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Mar 04, 2013
grounding
by: Dale

Maybe your generator was not grounded as per your instruction manual. Drive meatal rod into gound and run #6 copper and clamp to frame of generator. Next check centrifugal switch on motor or potential relay both are designed to kick out start capacitor when motor gets upt to speed.

Mar 03, 2013
Blew a capacitor
by: Buster Norris

Hey Dave, you may need to check the "Frequency", or Hertz of the generator, some capacitors are real sensitive to frequency variations and build up heat rapidly. The Frequency of most generators is directly controlled by the speed of the engine and the governor must be set accordingly, to maintain the engine speed accutatly, usually 3600 RPM, depending on the generator design.

Just a thought,

Buster

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Rol-Air D1500HP5 - capacitor has black tar oozing out?

Rol Air  Rolair  D1500HP5 air compressor (photo: www.mastertoolrepair.com)

Rol Air Rolair D1500HP5 air compressor (photo: www.mastertoolrepair.com)

I have a Rol-Air D1500HP5 1-1/2 hp pancake air compressor.

When I plugged the compressor in, it wouldn't turn over. Oil level is fine. I took the cover off to discover the existing capacitor has black tar oozing out of two blow-outs.

Ordered & installed new capacitor. Compressor started right up & built up pressure to 125psi.

Released pressure & the compressor would not fire at about 80 psi. A small blow-out appeared on the new capacitor oozing black tar.

There's obviously some other electrical resistance problem involved. Any trouble shooting suggestions?
______________
Now that is a problem I don't hear about often.

Was the compressor plugged directly into a wall socket, or were you using an extension cord? If you were using an extension cord, it is possible the motor was being under powered, creating heat?

I'll post this in the electrical section to enlist help from those folks that are more electrically inclined than I. Maybe they will post some suggestions as a comment?

Cheers,

Bill

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cheap power boss air compressor burns capacitor

by Mark
(Madison MO USA)

I bought a cheap air compressor years ago. within minutes of starting it for the first time it blew the capacitor. after looking for a capacitor on and off for years the other day I got it back out. But the old capacitor is long gone. It was one that had a stud on the end I don't know what size it was. and nothing to go off of. It is a single phase compressor. every capacitor I stick on it. It burns up with in seconds I have tried 370v and 44ov both and burns both of them up. I am guessing that it takes a start run capacitor only having one capacitor. Any recommendations on which cap to use ?? thanks in advance.

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Dec 19, 2013
motor cap
by: Doug in s.d.ca

There is usually an ID plate on the motor.

Look the motor up, and you should be able to find the cap value.

One cap is start cap, two is start/run.

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INstalling capacitors

by Aaron
(Texas, QLD)

Air compressor terminal box

Air compressor terminal box

Air compressor terminal box
Compressor capacitor leads
Air compressor capacitor terminals
Air compressor needs wiring

Hi all,

I followed some advice I got on a forum about buying an older belt driven compressor over a new cheap one.

well now im a bit stuck, I picked up one from a mate, and its all there but the capacitors for the electric motor are not installed and I cant work it out

He guaranties me that its all there but he has no knowledge of how it goes together either.

I have the motor with 3 wires coming out of it, I also have a small length of cable with terminals on each end

I have two capacitors, I think the black one is the starting capacitor but im not 100% sure,
the black capacitor has 4 terminals 2 of which have been linked with a resistor?

The white capacitor has 4 terminals at the top which are in two pairs of 2?

If anyone knows how this all goes together that would be great, if someone has a similar compressor and can pull the cover of there capacitor box that would also be fantastic.

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Feb 05, 2014
caps
by: Doug in s.d.ca

It all depends on the motor.

You need to talk to the maker or a distributor of the motor.

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