Rtech P50HF with THCAD-300

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27 Dec 2021 10:35 #230055 by Howlingg
I have the P50HF plasma cutter from Rtech, which is working very well with my DIY table and PlasmaC.  I currently have no THC and wish to use a mesa THCAD to do this.  I know that I cannot connect the THCAD-300 across the output because of the HF / HV start, so I need to work out where inside the machine I might be able to do this.  Attached are the supplied schematic and some photos of the inside of the machine if anyone is able to help - I am sure this might be of use to others as well.  Many thanks in advance.
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27 Dec 2021 11:16 #230058 by tommylight
The circle with V in it, that is where the THCAD should be wired.

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27 Dec 2021 18:06 #230072 by Howlingg
Replied by Howlingg on topic Rtech P50HF with THCAD-300
Many thanks for the quick reply - I should have seen that!!

Just to clarify, I can identify T2 and T3 easily, but not R8, C10 and C11, can I take the connection anywhere between T2 and T3, and then measure to the output line or is it critical exactly where? Thanks again

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27 Dec 2021 19:57 #230081 by tommylight
Yes.
The following user(s) said Thank You: Howlingg

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01 Jan 2022 15:47 #230458 by Howlingg
Replied by Howlingg on topic Rtech P50HF with THCAD-300
I have connected a multimeter between the ground clamp output and the point between T2 and T3 as above (on the right hand end of the yellow coil in photo 4 above, where the nut has been painted with red).

I used a cheap multimeter just in case!

Measuring high range DC (600v) , there is a flash from within the meter as the pilot fires, which I guess implies there is still HV present at this point. I am reluctant to install my THCAD-300 until I am certain I will not fry it.

Are you able to offer any further advice?

Many thanks

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01 Jan 2022 16:07 #230462 by tommylight
Did the multimeter survive ?
Try this.
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07 Feb 2022 19:48 #234279 by Howlingg
Replied by Howlingg on topic Rtech P50HF with THCAD-300
It's been a while until I had time to try this - but it works perfectly, Many thanks
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07 Feb 2022 20:01 #234283 by tommylight
Nice, thank you for reporting back.

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