15 hp dust collector 480v problem
15 hp dust collector 480v problem
(OP)
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.
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.





RE: 15 hp dust collector 480v problem
The following link shows the general idea: http:
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Start each day with a smile. Get it over with.
RE: 15 hp dust collector 480v problem
Searching the web didn't bring much. Are there no good diagrams available?
Gunnar Englund
www.gke.org
RE: 15 hp dust collector 480v problem
This link may help but I would prefer you or ScottyUK did the explanation. Im here to learn and for sure not advise.
Still wet behind the ears!
Chuck
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RE: 15 hp dust collector 480v problem
I wasn't going to post this because it links to a big file, but the 26th and 27th pages of the PDF - marked as pages 72 and 73 in the document - show things properly. And Siemens used proper symbols instead of the horrible ones in Chuck's link!
http://www.sea.siemens.com/step/pdfs/cc_3.pdf
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Start each day with a smile. Get it over with.
RE: 15 hp dust collector 480v problem
A diagram and education all in one! nice link.
Chuck
RE: 15 hp dust collector 480v problem
Gunnar Englund
www.gke.org
RE: 15 hp dust collector 480v problem
prep. Is the Siemens reference still active?
Any restrictions on using the doc?
Thanks.
<als>
RE: 15 hp dust collector 480v problem
Yes, took it ages to find: I wasn't happy with the errors in the reference from my first post, so it had to be improved upon!
Do you mean 'Are the Siemens part numbers being still active?' I think the IEC ones are, certainly the Sirius range is fairly new. Not sure about the NEMA ones.
I'm not clear about restrictions on using the document - it is in the public domain and presumably put there as an educational resource, so I guess as long as you credit the origin of the document, don't alter it and acknowledge their copyright...
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Experience is what allows us make a completely new mistake every day!
RE: 15 hp dust collector 480v problem
You are correct, there are no restrictions on the use of these documents. They are part of a series of educational booklets (called STEP 2000) and include all sorts of useful info from switches to PLC's and drives. I know the chap who wrote the drives booklet and he is more than happy for people to download and read them. They are part of an online training program available via Siemens Energy & Automation in the USA (pity my German colleagues never seem to do such a useful thing...)
RE: 15 hp dust collector 480v problem
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Experience is what allows us make a completely new mistake every day!
RE: 15 hp dust collector 480v problem
Your link indicaating pages 72 and 73! Are good.
But can you tell me why the OL (overload contacts) are positioned on the neutral side of the coil? I have never fully understood this method.
Thank You
pennpoint
RE: 15 hp dust collector 480v problem
This is a long-standing controversy. In general switching of the neutral side of anything is not allowed, but NEMA ICS 2 recommends this location for OL contacts due to the risk of welding of the overload contacts if exposed to short circuits (if control circuit is grounded at some point.)
Since the contacts are normally closed, this problem would not be detected during normal operation.
The NEC would not allow this for REMOTE devices, but it is allowed for an overload relay that is integral to the starter.
But some engineering firms do routinely specify the OL contacts to be on the other side of the coil.
RE: 15 hp dust collector 480v problem
possible, even if I only use excerpts. Just seems like the
right thing to do.
<als>
RE: 15 hp dust collector 480v problem
I now see the logic.
But you confirmed our procedure, we place it on the hot side of the coil.
Thanks
pennpoint
RE: 15 hp dust collector 480v problem
You want the motor to run or not?
RE: 15 hp dust collector 480v problem
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I don't suffer from insanity. I enjoy it...
RE: 15 hp dust collector 480v problem
If the starter is in good shape with no unused holes then locate the auxilliary contacts. Locate the coil, one wire from the coil usually connects to the overload relay which is usually below the main contactor. You want the other wire from the coil. Typically this side of the coil will have one wire to the Start Button that you have been pushing and another wire will go to the auilliary contacts. If there are any numbers on the auxilliary contact they will typically be 2 and 3 not L2, not T2,just 2 and 3. If you find the numbers great, if not just follow the wires.
I'm sure someone will jump in and give you the European numbering in case you have a European starter. Find the wire from the coil to the Start Button and look for another wire from the same terminal to another device on the main contactor. This is the device that you want to check. The wire from the other terminal on this device will usually connect to the other side of the Start Push Button.
RE: 15 hp dust collector 480v problem
Dust collectors are notorious for exploding into flames. They are perfectly designed for mixing air with combustionable dust. They normally have lots of fire systems incorporated with them.
There could be some keep alive signal missing now.
RE: 15 hp dust collector 480v problem
Methinks the OP was a one-shot wonder who really had no business wiring up a motor starter to begin with because he had no clue about 3 wire control. He probably replaced the start button with a light switch. Then he'll be upset that the motor comes on all by itself after a power failure! Don't laugh, I have seen it a lot.
Eng-Tips: Help for your job, not for your homework Read FAQ731-376
RE: 15 hp dust collector 480v problem
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!!
RE: 15 hp dust collector 480v problem
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
RE: 15 hp dust collector 480v problem
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.
RE: 15 hp dust collector 480v problem
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
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RE: 15 hp dust collector 480v problem
http://www.epsilon-ltd.com/Dust.html
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