stevieturbo
Member
- Messages
- 90
- Location
- Norn Iron
I've had the machine from new, a longgg time ago.
But intermittently, wire speed just doesnt play ball. It can run correctly for a few seconds, then slow down for a couple, then back to normal again. All at random.
With no load, no weld....motor speed seems steady for as long as I hold the trigger though.
However...with a scope on the motor ( 0-50v scale as attenuated 10:1 )
Left side is a single trigger pull at a low wire speed. Right side is a single trigger pull with middle wire speed of the dial. No load, no weld test.
Voltages are almost stable for a short while...then all over the place, then stable for a bit...then all over the place.
For comparison I tried the motor off a small 12v battery just to confirm scope operation etc.
Board PCB
Machine
Likely something on the PCB at fault ? Or the motor itself ?
Repair options ?
I did replace the little rotary pot a few years back and the problem seemed to go away after that. But it's been doing it for a while now ( infrequent DIY use ). I tried another pot but it didnt seem to make a difference.
Thanks
Stevie
But intermittently, wire speed just doesnt play ball. It can run correctly for a few seconds, then slow down for a couple, then back to normal again. All at random.
With no load, no weld....motor speed seems steady for as long as I hold the trigger though.
However...with a scope on the motor ( 0-50v scale as attenuated 10:1 )
Left side is a single trigger pull at a low wire speed. Right side is a single trigger pull with middle wire speed of the dial. No load, no weld test.
Voltages are almost stable for a short while...then all over the place, then stable for a bit...then all over the place.
For comparison I tried the motor off a small 12v battery just to confirm scope operation etc.
Board PCB
Machine
Likely something on the PCB at fault ? Or the motor itself ?
Repair options ?
I did replace the little rotary pot a few years back and the problem seemed to go away after that. But it's been doing it for a while now ( infrequent DIY use ). I tried another pot but it didnt seem to make a difference.
Thanks
Stevie