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| Mini Lathe Electrikery....... |
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| Stilldrillin:
Thanks for your thoughts, Chaps! :thumbup: Working downwards, from my last pic..... Dave. Motor is 400 watts. 5A machine fuse, (which didn't blow). 13A plug fuse, as delivered, (which did blow)....... Will swap the plug fuse for 5A, when sorted...... Ade. Neutral wire undamaged, except where all wires have been screwed up, to fit in the nil available space at each end..... I've cleaned out the motor, (lot of oily brush powder), and fine emeried the dirty commutator. New brushes...... The belt is not fitted yet. Should ease test start up...... Stuart. No swarf, as such. Just oily film..... Jim. Thanks Mate! While I'm here..... I need the correct brushes. The new ones are only 8mm wide, need 10mm x 4.5mm, with eared brasses. Saw an addy, some time ago with pics & sizes of the various types available..... Anyone else know what I'm on about? :scratch: David D |
| andyf:
David, there's a troubleshooting guide at http://littlemachineshop.com/Reference/DriveTroubleshooting.pdf , from which it looks likely that the mosfets on the speed control board are prime suspects. If the suppressor is on the input side of the speed contro board, it is hard to imagine that a suppressor fault could cause the motor to run flat out. In any case, the nature of a suppressor is such that a fault on it would be unlikely to increase motor speed. Odd, though, that it ran at full speed in reverse, when the switch iwas set to forward. Andy |
| Bluechip:
Dave Brushes ?? Are the brushes in that Warco motor I gave you the same size ???? BC |
| lordedmond:
David If the machine fuse did not blow but the 13 a plug top one did , then I would plump for the board that you have shown and not the control pcb as I said ditch it and join the wires up and try , it don't go now so you cannot make it wosera :) I have spent the greater part of my working life refilling electrical with magic smoke ( not done so for 15 years but spent 37 years at it ) my guess as to the reversal is that it faulted to earth and applied a voltage across the controller Stuart |
| John Swift:
Hi David the damaged PCB is a mains filter and you should be able to test the speed control board without the filter first test it without the motor connected and a 60W to 100W GLS bulb in series with the live supply to limit any possible fault current the bulb needs to be a have a tungstan filament (eco bulbs don't work for this test) if the bulb only glows dimly and not full brightness retest without the bulb ,but now with the motor connected as I can't download the manual for your machine what speed control pcb do you have ??? John |
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