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Delta Radial arm saw 33-990 tripping circuit breaker

Hello

I have had this saw for 8 years with no problem. It is on a dedicated 15 amp breaker. It has just started to trip the house breaker after about 1 minute of running. You do not even need to be cutting anything. Just running the motor for 1 minute or less will trip the breaker in the house. I am not sure if it is the motor or possibly a capacitor. A new motor is $680 dollare while a capacitor is $80. A whole new machine is $780.

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I doubt the motor is bad. Try it on another circuit to see if the same problem exists. Due to the inrush current of the motor, the circuit breaker may now be defective after several years of use.

If you have the ability, determine the no load current on the motor, and then try it cutting a piece of wood.to determine the load current. If it is within the rated current of the motor, then it's fine.


Posted on Sep 22, 2009

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More than likely motor but try this , if you have a wrap around amp probe or can borrow one or purchase a cheap one place the amp probe around the positive wire connected to panel breaker ,with meter on proper scale ,start saw and read probe current , if cap bad current will be high and stay until breaker trips , if motor will start high on start ,then low then ,very high and breaker will trip , be careful in panel working around live circuits , the reason it reads this way is because as the motor warms the laminates it the armature separate and cause the increase in current to spike ,if cap bad never gets to speed and has high current draw constantly , to verify cap(1) remove from circuit (2)place a screw driver across terminals to release any charge (3), then take ohm meter on ohms place meter leads on terminals one on each terminal at same time meter will rise and fall back(4) reverse leads and should rise and fall as before if it does this it is more than likely good a lot of electrical reasons for this but this will tell you what you wanted to know , good luck

Posted on Dec 11, 2008

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