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Watch in Urdu / Hidi    • #102 Single Board Inverter IGBT Welde...  
in this video in this video i explained the working principle of single phase / 3 phase, Single Board / plate / circuit card Inverter IGBT or MOSFET, Welder Machine mma 200 / 140 ampere. - Function & Troubleshooting, i demonstrated how to troubleshoot, test and repair igbt dc inverter welder / welding machine.

this china MMA Inverter IGBT Welding Machine is single phase 220 VAC operated. it have a bridge rectifier which rectifies the main ac voltage into dc voltage, which are connected to pair of dc capacitors through a relay contacts and in parallel 110 ohms ntc resistor. this nts protects from inrush current and upon receiving relay drive signal it switches the rectified voltage to capacitors so, the ntc is bypassed to get full current to drive igbt.

then these voltage are switched into pulsed dc voltage to drive the primary of the high frequency power transformer, which drives the output schottkey rectifier diodes, which provide the output for welding

all function is controlled by inverter control board, sg3525 is used to control the pulse width for current mode circuit, low voltage power supply is used to power up the circuit
after watching this video you will learn:-
how to #repair #inverter #igbt #welding machine or welder
2. functional description of inverter igbt welder machine
3. how to troubleshoot arc welding machine
4. how to understand mma-200 circuit diagram and how it works
5. if welding machine does not work, how you will repair
6. if main circuit breaker trips off when power switch is turned on
7. over current OC LED light turns on




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