Soviet VD-402 welder (ВД-402)

[Kenterfur]

Hello, recently got this old welder basically for nothing, trying to fix her up. If someone has the electrical schematics for it or any information it would really help me out.
And does anyone know how the current adjuster in the last two images works? The main way to adjust the current is by lowering or highering the primary winding with a screw, however there is this second adjuster with two options right or left and I'm unsure how it works. It's not a tap to the windings since there are only 6 terminals on the primary and secondary (2 for each phase), could it be a rheostat? It seams like the current would be too high? It has 6 inputs(3 phases from the mains and 3 high amperage from secondary) and 6 outputs.

Thanks in advance for any input!

 

[Mark 2]

That would have worked with Ukrainian rods back in the day.

 

[voipio]

Try and work out which contacts open and close as the second adjuster is moved from the I to II positions, and work out where the wires go.

 

[Sergei Slovenija]

The electrical diagram for the ВД-402 welding machine is available for download in PDF format. You can find it on the WordPress site, where the diagram of this device is posted[5].

This welding rectifier VD-402 is designed to be used as a power source for one welding station for manual arc welding and cutting[3]. If you need more detailed information about the operation or technical characteristics, it may be worth referring to specialized resources or technical documentation available from manufacturers or equipment suppliers.

Citations: [1] https://weldstar.narod.ru/Professional.htm [2] http://lmk-lipetsk.ru/org_pit/ОПОП-П 15.pdf [3] http://www.secoin.ru/bd/svarka/vipriam.html [4] https://td-mso.ru/katalog /svarochnoe-oborudovanie/svarochnye-vypryamiteli-i-transformatory/svarochnyj-vypryamitel-vd-402-master [5] https://filestpuq.files.wordpress.com/2015/04/el-shemu-svarochnogo-apparata-vd-402.pdf [6] http://www.vikservice.ru/downloads/shemy-invertornyh-svarochnikov/vd_2/ [7] https://www.vikservice.ru/news/nashi-novosti/dobavleny-novye-shemy-

 

[eddie49]

Since it only has two positions, it is not an adjuster. It is not a rheostat, it is a switch. The presence of those 6 fat diodes on their fir-cone heatsinks means this arc welder is DC-capable, so maybe the two-position control selects AC or DC output.