Why does my dw831 grinder keep tripping circuit breakers?
When you plug in the dw831 grinder, and then pull the trigger, the grinder runs for maybe five seconds, makes a terrible noise in the process, almost like a three phase motor that is single phasing, then the circuit breaker will trip. what is up?
Re: why does my dw831 grinder keep tripping circuit...
Try checking the brushes.
to do this: remove the 2 small covers on the left and right side of the tool and push aside the coil spring holding in the brush. the brush should freely pull out of the holder.
when you have the covers off, look for charring or melting. and after the brushes are out, rotate the arbor to move the armature inside and look to make sure it's not charred.
if that doesnt help, take apart the handle and look for melted or exposed wire. dewalt likes to pack the wires in tight among the screws and sometimes the normal vibration of the tool will cause a screw to cut into a wire and short the wire.
new brushes and holders (if melted) are usually around 20 dollars US
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The magnetron probably has a partial short pulling more current than normal as it runs, the other two items that give trouble is the high voltage diode, "sometimes cracks" to the high voltage capacitor, "usually shorts"
Please don't give me a bad rating for this. Its just a little extra info. you didn't mention that may help you find the problem. Depending on your specific model, there should be 1 or 2 breakers on the unit it self. If there is only 1, it will shut down the entire machine when tripped. If there are 2, the top one is for the whole unit and the lower one is for the wire feeder motor only. There is also a thermal overload that will shut down everything except the cooling fan. Secure the trigger closed and let the fan run for a while to see if it re-starts when cooled. If the depth of the weld was stable before the problem occurred, I would suspect a short in the motor and not the rectifier. That is not a sure bet though. If the transformer does not start when it cools, UNPLUG the welder and short the transformer to ground to be sure the capacitor is discharged. Then isolate the feed motor and transformer and use an OHM meter to test them individually to ground for a short. With a little luck, it will be the feed motor. Please let me know if this helped at all. I am new and still learning how to explain what I am thinking. Thanks for writing us. Roger
Assuming your local tech confirms that your bench grinder tests ok. The problem is probably that the grinder draws too much current for the RCD and is therefore detected as an earth leakage. High amperage devices often do that. Your best bet would be to plug it in to a socket which is on a non-rcd circuit. Maybe you have an RCD on the whole house though?
I would start with returning the grinder and trying a different brand with a lower amperage/wattage rating. If that doesnt work, I would call an electrician to discuss installing a different RCD or running a separate circuit for your power tools.
If it is tripping the breaker, stop plugging it in. The breaker is tripping because something is wrong, and continually resetting the circuit WILL cause a fire. Either return the unit, or have an electrician look at it. You can also try plugging it into another circuit in your house to isolate the problem, but please don't repeatedly reset the breaker, there IS a problem somewhere.
get an inexpensive clamp amp meter (Harbor Freight has them). Turn off power to the plug. Remove plug from wall but do not disconnet wires. turn fridge OFF. plug the unit in the recept. turn on the power. set the meter for the higest reading (amps) & clamp it around the black wire. turn the fridge ON & observe start up current & the "run" current. If the fridge is within limits on the data plate the problem is in the wiring circuit, maybe a loose connection either @ the plug or the breaker. if there are several plugs in the circuit, the problem could be in one of them. In addition, if there is a gfi plug in this circuit, it could be faulty also.