Stahlwerk Plasma Cutters THC Interface

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23 Oct 2025 05:50 #336936 by Nilres
Hi,I'm currently on my journey to build a CNC Plasma Cutter. For the plasma source I'm looking into the Stahlwerk Line-Up of Plasma Cutters (Cut70 or Cut100). All Stahlwerk Cutters have a build in THC Connector. What I can't figure out is if this connector is already divided. Or if an external divider circuit is needed. The Manual just says that it is used to connect the cutter to a CNC controller. Does anyone have detailed information? Or own such a device at has already checked the voltage levels? Greetings
Nils  

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23 Oct 2025 06:55 #336939 by Hakan
Replied by Hakan on topic Stahlwerk Plasma Cutters THC Interface
If it's this one www.stahlwerk-schweissgeraete.de/plasmas...t70-pilotzuendung-en 
I would look at one that doesn't use HF start. You don't want HF start in cnc table.
Generally, blowback start is what you want.

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23 Oct 2025 10:44 #336950 by rodw
Replied by rodw on topic Stahlwerk Plasma Cutters THC Interface
The THC voltage is raw cutting voltage. a THCAD can use this with the right scaling resistors. I would expect there are some resistors between these terminals and the cutting terminals to avoid lethal current! Check with a multimeter.

here the thcad manual is your friend. 200 V full scale will be best but 300v is also Ok

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23 Oct 2025 13:52 #336958 by tommylight
Replied by tommylight on topic Stahlwerk Plasma Cutters THC Interface

All Stahlwerk Cutters have a build in THC Connector.

Black ones, maybe, the white ones not all for sure.
They are good and have a few years warranty, but aim for 70A at least, the exact one that Hakan proposed.

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23 Oct 2025 14:21 #336961 by Hakan
Replied by Hakan on topic Stahlwerk Plasma Cutters THC Interface
Are you sure, Tommy? It got HF start.

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