THCAD 10 to Herocut 55i (1:1)

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01 Jan 2022 22:33 #230493 by Ekholm
Hi! I have bought a THCAD 10 to use and now have a new plasma Herocut 55i (1:1)
how can I connect it? Can I build a voltage divider or can I somehow rebuild to a THCAD 300? I guess that I can’t calibrate with that high voltage? (I have a oscilloscope with insulated probes With max 1300v )
thanks /Andreas

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01 Jan 2022 23:54 #230505 by tommylight
You can use two 1MOhm/2W resistors, one on each wire to THCAD.
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08 Jan 2022 15:02 #231127 by Ekholm
Hi! I have now connected the resistors. Does this look right? I only ordered 1w resistors, because I couldn’t find 2w high voltage ones…
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08 Jan 2022 17:29 #231140 by Clive S
Personally I would put the resistors inside the plasma as then you would get better protection re the current
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08 Jan 2022 18:10 #231146 by tommylight
Two things:
1. It is never a good idea to use the same connectors for input and output, that is just fire waiting to happen.
2. Metal connector on the high voltage side, again fire.
Use normal home power sockets if you have nothing else, if you are in Europe they are rated for 250V, if in US = you're out of luck as the 220V stuff there is big ! :)

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08 Jan 2022 19:06 - 08 Jan 2022 19:09 #231152 by robertspark
you could use IEC connectors or figure of 8

I would put the divider in the machine. I would not export raw arc very far...... when I had an old Powermax 350, and used a raw arc voltage output into a Proma THC 150 (I knew nothing then and only know a little more now), I bolted the enclosure to the side of the plasma cutter and within it I located the PromaTHC 150, and just had 1 connector on the side of it with those circular connectors.

I have since used them extensively, but I use all sorts of pin connections (2, 4, 5, 6, 7, 8,9 and 10 pin connectors so that there cannot be a mix up on wiring or voltages etc)
Last edit: 08 Jan 2022 19:09 by robertspark.

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08 Jan 2022 20:01 #231156 by Ekholm
Thanks! I will move the resistors inside the machine. My Herocut plasma has these metallic connector (but smaller), but I share your thoughts but didn’t want to tamper with warranty. But I will move the resistors as I share your consern. 

But Shall the resistors only be in series? That’s not what I imagined a voltage divider? Can someone please make a picture how I should connect the resistors.

the connectors is 7 and 4 pin so I can’t mix them up.

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08 Jan 2022 20:17 #231163 by Ekholm
 

this is how I think a voltage divider looks like?! Is this how I should connect it? :)
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08 Jan 2022 20:47 #231167 by billykid
not so ... simply in series. the divider is in the thcad board. one in series to pin 1 and one in series to pin 2
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08 Jan 2022 20:53 #231170 by Ekholm
Thanks!

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