15 hp dust collector 480v problem

[larryc4]

I have a 15hp 480v dust collector that I bought used. When I applied 480v power and turn on the power to the motor control cabinet and pushing the start button the motor tried to start.
When I push the start button and hold it in the motor runs fine, but if I release the button the motor will stop.
Can you try to give me some possible things to look for. All fuses at good.

 

[itsmoked]

Hey ya jraef,

We had a tannery (down here south of you 60mi) in our town and they had a dust collector on a leather sander. That sucka caught on fire twice a year!!

 

[jraef]

Well, at some level any animal product is potentially combustible, otherwise crematoria wouldn't exist! I found out about leather in a different way. It was being used in polishing wheels for chrome in one plant I did some work at, and I saw the explosion proof electrical enclosures. Found out that when the leather polishing wheels emmitted fragments of chrome and leather, it was combustible.

Another one that I came across that I never would have guessed was aluminum dust, but afer seeing many beer cans burn in campfires I should have guessed.

Eng-Tips: Help for your job, not for your homework Read faq731-376

 

[waross]

Jraef
I understand that the first thermite welding was done on railway rails. The active ingredient was Alumunum powder mixed with Iron Oxide powder. When the Aluminum burns, it combines with the oxigen in the Iron Oxide. The product of combustion is Aluminum Oxide and Molten Iron. I'm not sure of the composition of a Cad-Weld charge but I understand that Aluminum powder is still an ingredient.

 

[itsmoked]

Aluminum dust, yes definitely nasty.

A main constituent of highly active rocket fuel.

Also one of the two constituents of the ever popular Thermite.
Recently a guy who had been grinding aluminium on his bench grinder came back days later and started grinding steel. Aluminum powder + Iron powder = Thermite. The hot Iron reached the proper mixture with the existing aluminum dust and the reaction proceeded rapidly. So fast that his face was seriously burnt along with his clothing.

Yes, Aluminum dust.. Boo Koo flammable.

Amazingly when you grind stuff up small and suspend it in air lots of things are dangerous.

Carbon
Iron
Flour
Cornstarch
Ca
Mg
Si
Cr
Zn
Cu
Sucrose
Starch
Polyethylene
Coal
Sulphur

http://www.chemeng.ed.ac.uk/~emju49/SP2001/webpage/

 

[stardelta]

Here a couple of links relating to combustible dusts and Euro-standards you Guys might find interesting.

http://www.epsilon-ltd.com/Dust.html

http://www.epsilon-ltd.com/ATEX_Certification1.html