Hello
I have a power supply in a small welding machine rated at 110v input 100A output at around 20vdc.
I have drawn out the supply and see an obvious short when the thyristor is pulled in.
The breaker trips out when the machine is triggered (thyristor triggered) i have checked the gate to the thyristor and the pulses are 1.2usec and duty cycle of around 5% for the start current.
if i remove the fuse (which is causing the trip to trip out) then the trip will stay in but no output, i am taking it that the inductor and 20A fuse creates some sort of limited circuit but just cant see how this would work.
Anyone with power supply knowledge willing to help.
PS This machine could be connected wrong in the past (it is an option !!)
Nb the coil is inside the heatsing which is the transformer and the inductor at the side of the fan is the L=391
Come on you inverter experts !!!!
Thankyou
Mark.
I have a power supply in a small welding machine rated at 110v input 100A output at around 20vdc.
I have drawn out the supply and see an obvious short when the thyristor is pulled in.
The breaker trips out when the machine is triggered (thyristor triggered) i have checked the gate to the thyristor and the pulses are 1.2usec and duty cycle of around 5% for the start current.
if i remove the fuse (which is causing the trip to trip out) then the trip will stay in but no output, i am taking it that the inductor and 20A fuse creates some sort of limited circuit but just cant see how this would work.
Anyone with power supply knowledge willing to help.
PS This machine could be connected wrong in the past (it is an option !!)
Nb the coil is inside the heatsing which is the transformer and the inductor at the side of the fan is the L=391
Come on you inverter experts !!!!
Thankyou
Mark.