I screwed up and cooked something on the chuck power supply of my Blanchard 18. I was surfacing a weldment to become a machine base and had a low spot. I made the poor decision to weld up the low spot with the part on the machine (I know...). I used a Miller XMT 350 and suitcase feeder to make the weld. I had the ground sitting directly on the part. It was done with the main chuck power contactor off. After I went back to grinding and found the magnet wasn't holding. The magnet ON light is illuminating and the Neutrol is working as before, but there's no magnetic force.
The machine has a motorgenerator feeding to a variable resistor, then to the Neutrol. I have 172V coming from the vari-resistor and cannot turn it up any further. The chuck has a tag that states 220V rated, so I am outside of the ±10% voltage window. I do not know if the voltage was full 200+ prior to this. I believe the genset and control are operating correctly.
The issue I have found is across the "CHUCK" poles in the Neutrol box, I have 2.7 K-ohms resistance. The manual says my 30" chuck should have 86 ohms. I lifted the chuck to inspect the brushes and slip rings. With the chuck lifted, I have the same high resistance across the poles. I am in the process of cribbing the chuck so I can get underneath and check continuity from the brushes to the control box.
My main question is, where is the 2-wire supply cord to the chuck carriage from the Neutrol located? I see the leads go into the side of the base, but have no access to track them further. There is nothing going from the chuck control switches by the operator in toward the chuck ways.
EDIT: I confirmed a broken or burned wire between one chuck brush and the Neutrol
Any other ideas or jabs at my stupidity are welcome.
Thanks.
The machine has a motorgenerator feeding to a variable resistor, then to the Neutrol. I have 172V coming from the vari-resistor and cannot turn it up any further. The chuck has a tag that states 220V rated, so I am outside of the ±10% voltage window. I do not know if the voltage was full 200+ prior to this. I believe the genset and control are operating correctly.
The issue I have found is across the "CHUCK" poles in the Neutrol box, I have 2.7 K-ohms resistance. The manual says my 30" chuck should have 86 ohms. I lifted the chuck to inspect the brushes and slip rings. With the chuck lifted, I have the same high resistance across the poles. I am in the process of cribbing the chuck so I can get underneath and check continuity from the brushes to the control box.
My main question is, where is the 2-wire supply cord to the chuck carriage from the Neutrol located? I see the leads go into the side of the base, but have no access to track them further. There is nothing going from the chuck control switches by the operator in toward the chuck ways.
EDIT: I confirmed a broken or burned wire between one chuck brush and the Neutrol
Any other ideas or jabs at my stupidity are welcome.
Thanks.