Grinder plugged into 240V, fixable?

[shoeless]

So I have a a normal 120V grinder that got plugged into a normal outlet that turned out to actually be 240V. Was working in someone else’s shop, honestly not even sure they were aware it was wired this way. The grinder sparked internally when the trigger was pressed and died very shortly. Is there a possibility this is fixable? Any ideas what might need to be replaced?The grinder is a Hitachi G 12SQ. It had effectively zero usage before this happened.
Thanks

 

[shoeless]

I just tried it again. It will spin but is has no power and kind of sputters. Has a little electrical burn smell to it also. Could it just need new brushes?

 

[American Locomotive]

Take it apart and see what's burnt. No point in trying to guess without any diagnosis.

 

[ckeboss]

So someone wired a NEMA 5-15 socket with 2 hot legs?

 

[65ranchero]

I have seen /or heard of this:
pretty sure it was done by accident.
The office where our call center was located had a auto shop attached and some eletrical work was being done and one of the electrical contractor help wired the panel wrong.
The worker in the shop plugged a shop vac. into that outlet and I have never heard a vacuumn spool up so fast.
The contractor bought the shop a new vac.

 

[Kscardsfan]

So someone wired a NEMA 5-15 socket with 2 hot legs?

That’s what I’m wondering.

 

[shoeless]

So someone wired a NEMA 5-15 socket with 2 hot legs?

Yes, it was a 2 gang outlet box and both of the top outlets had 2 hot legs. The bottom two were wired correctly.

 

[rancherbill]

That's too bad, but once you let the smoke out of a grinder it is not cost effective to put it back inside.

Sorry

 

[shoeless]

Went ahead and opened it up. One of the brushes is basically gone and the commutator was all carboned up. I cleaned the commutator up and measured the commutator bars at 180 degrees and all were right around 1 ohm. Then measured between adjacent bars and they all measured around .25 ohms. Then I measured all bars against ground and all showed no continuity.

So I tried running it with the brushes in there and it works but the really worn out brush is sparking like crazy. I found a set of brushes for $7, should have them tomorrow. Will touch up the commutator again and install the new brushes and see how it goes.

 

[ddawg16]

You let the magic smoke out....there is no putting it back in.

 

[rancherbill]

....Will touch up the commutator again and install the new brushes and see how it goes.

Send money to one of those faith healer guys to pray for it.

Hope it works, but, I have never had good luck with this type of thing.

 

[seber]

Don't listen to them. If the commutator is good, new brushes should put it fine. It may spark a bit till they wear in.

 

[BreeStephany]

What brand / model is the grinder? Likely the set(s) of winding the brushes were in contact with when it powered up burned and short circuited to another part of the winding, but did not short out to other windings. You can rewind the damaged windings with enameled copper wire as long as you match the number of factory windings and do so with the same gauge wire as used by the factory, however, this can be quite the process if you've never rewound a field or armature.

The wire is relatively inexpensive, however, depending on the grinder, it may be cheaper to either buy replacement components or just buy a new grinder.

Just my two cents.

 

[tarbellb]

Funny

we just blew 6 cordless battery chargers after a cord was plugged into a 220v unmarked spider box outlet


Should be noted the first time it only blew 4 chargers and the powerstrip....


Then I labeled the outlet "220v", but its been reamed out so hard you can plug a 120v twist-lock into it no problem

End of the week a different crew member did the same thing and zapped the other 2 chargers

 

[Ouarzazate]

Anyone knows if a US-spec 115V Drill Doctor 750X that was accidentally plugged into 230V can be easily repaired? I see there are suppliers of a so-called 230V "filter" for these machines. There was no smoke, only a brief flash from the switch. I am hoping this "filter" has just blown and could be replaced?

 

[seber]

Bypass the switch and see if it runs. If not, it's toast.

 

[pcmeiners]

"I just tried it again. It will spin but is has no power and kind of sputters. Has a little electrical burn smell to it also. Could it just need new brushes?"

Do you actually believe you could win the mega pot lottery? That grinder has about the same chance.