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Watch in English Language    • #293  Inverter IGBT Welder (Part -7) ...  
Download circuit diagram https://drive.google.com/file/d/1SXRY...
https://drive.google.com/file/d/1rz0R...
Control Board of Inverter IGBT Welder Machine Manual Metal Arc (MMA) is explained in urdu hindi language (Circuit Description & Working Principle)
this control board is incorporated to manage safeties and and adjust the duty cycle to produce a current control function. the maximum peak current is detected by current transducer (peak current detect transformer) which is installed in the input DC port entering to IGBT power section. output load current is monitored a current sense shunt resistance connected in -ve output terminal. the dropped voltage on this shunt resistor are equal to its resistance value and the load current. a reference required current is fed by using front panel current setting potentiometer. a short circuit detection circuit is used to monitor the short circuit conditions at load end
control board compares all values and calculates and provides a corrective error signal to adjust the output duty cycle of sg3525 or UC3845 or TL494 or A7500 or microcontroller (whatever is used)
LM339 or TSM102 operational amplifier opamp & comparator are used to calculate the inputs. temperature protection circuit is used to protect the circuit in case of over temperature of igbt modules

To watch Part 1    • #90 Inverter IGBT Welder Machine (Par...  
Part 2    • #91 Inverter IGBT Welder Machine (Par...  
Part 3    • #92 Inverter IGBT Welder Machine (Par...  
Part 4    • #93 Inverter IGBT Welder Machine (Par...  
Part 5    • #98 Inverter IGBT Welder Machine (Par...  

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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