Fronius Magic wave 2000 Fuzzy failure

[Jan-DIY]

Diodes arranged on the right side of the machine.
Easy to test with Multimeter in diode mode.
Unfortunately these diodes are not easy to acquire.
Some sort of ultrafast is needed like STTH20003tv1.

 

[Seadog]

Easily acquired, but not cheap

https://uk.farnell.com/stmicroelectronics/stth20003tv1/diode-module-300v-200a-1-2v/dp/2629707

Mouser are a little cheaper - https://www.mouser.co.uk/ProductDetail/STMicroelectronics/STTH20003TV1

 

[Jan-DIY]

Good practice to change them all.
But first of all try to find out if one of them is short.
If so you can cut out one leg of the broken one and test the machine function. But not in full throttle.

 

[boky043]

Thank you for pictures, Jan and thank you for links, Seadog.
I will test them all today.

 

[Seadog]

There are plenty of Chinese offerings on eBay at around half the price.

 

[boky043]

I've tested diodes today and one diode was short. Then I cut the leg and tested welder.
It was working again. Must order new diodes asap.
Thank you guys for help! I appreciate it!

 

[Jan-DIY]

You’re welcome.
What type of diodes are installed?

 

[boky043]

C614E ST FRO178

 

[Jan-DIY]

Fronius marking.
Afaik stth2004 or 2003.
You need to get the mating ones.
Otherwise they go up in smoke early.

Fronius magic Wave 2000 zündet nicht - Seite 5 - Zerspanungsbude

German Website

 

[boky043]

Hi Jan,
Will these work (STTH20003tv1) if matched?
What does it mean?

Afaik stth2004 or 2003.

 

[Jan-DIY]

If you change all diodes they will do the job.

 

[boky043]

If you change all diodes they will do the job.

Thats good news since I've ordered all four diodes already.
Thanks Jan.