davida1949
New Member
- Messages
- 22
HI DID YOU MANAGE TO FIND OUT WHAT IS RUNG I HAVE SAME WELDER DOING SAME BOW THE FUSE PLEASE LET ME KNOW THANKS
DAVID
DAVID
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an alternative browser.
You should upgrade or use an alternative browser.
Thermal arc 175te PTC/NTC
- Thread starter charlton1706
- Start date
The OP has not been online here for over 4 years.
The soft-start thermistor being burnt, and/or the supply fuse or circuit breaker tripping is usually caused by excessive input current due to a shorted component in the inverter power section. This is often one or more of the MOSFET or IGBT power transistors.
In a half-bridge inverter the smoothing capacitors are in series across the rectified mains, and a shorted transistor will put full voltage across one capacitor, and if rated at only 200v it will blow.
When a power transistor shorts it can feed the high supply voltage into the gate driver circuits and damage them, and unless corrected this in turn will destroy a replacement transistor.
At the last posting the OP had replaced capacitors and a shorted IGBT, and his welder was powering up without blowing any further components, but would not arc. I would suggest you start by removing all the IGBTs and testing them for short-circuits.
The soft-start thermistor being burnt, and/or the supply fuse or circuit breaker tripping is usually caused by excessive input current due to a shorted component in the inverter power section. This is often one or more of the MOSFET or IGBT power transistors.
In a half-bridge inverter the smoothing capacitors are in series across the rectified mains, and a shorted transistor will put full voltage across one capacitor, and if rated at only 200v it will blow.
When a power transistor shorts it can feed the high supply voltage into the gate driver circuits and damage them, and unless corrected this in turn will destroy a replacement transistor.
At the last posting the OP had replaced capacitors and a shorted IGBT, and his welder was powering up without blowing any further components, but would not arc. I would suggest you start by removing all the IGBTs and testing them for short-circuits.
