learningtoweld
Member
- Messages
- 95
- Location
- Cheshire
I didn't hear any cracking or smoke. Do you think I could of damage it ?
Great, thank you and will try that, thanks again for sticking with it.Ignoring the "24v transformer" paradox and looking at the actual wirefeed issue:
In post #60 you got 19.5v DC at the torch tip at voltage/power setting 1. Stay on setting 1 - the higher settings may be too high for the motor without thyristor control.
With your meter black wire clipped to the negative output bolt of the main rectifier, and the torch trigger pressed, the positive rectifier output should be slightly higher than that ( due to the voltage dropped across the inductor ). This 20-odd volts should also be present at pin 2 of CN1, pin 3 of CN2, and both ends of the on-board fuse.
Power-off and put the short-circuit back across the BT151 thyristor, linking Cathode to Anode by joining the left to the middle pin.
Power on, press the torch trigger. The motor should run full-speed. Using the probe on the red lead of your meter, recheck the voltage at the fuse, at the bottom end of the large rectangular white 15W 4.7 Ohm resistor, at the top end of that resistor, at pin 2 of connector CN2, and on the black wire at the back of the motor. All these points should be about 20 volts with respect to the negative of the rectifier - but if they were, the motor would be spinning! Somewhere, that voltage is going missing.
After the rectifier, so all DC.In post #60 you got 19.5v DC at the torch tip at voltage/power setting 1. Stay on setting 1 - the higher settings may be too high for the motor without thyristor control.
With your meter black wire clipped to the negative output bolt of the main rectifier
The 35.8v AC from the "24v" output is too high!!