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18 Aug 2019 09:03 #142423 by tecno
THCAD was created by tecno
Having issues to understand (english not my native language) this for connecting THCAD to the plasma cutter.
Pins 3 and 4 SHIELD, is this to be for a shielded cables for the Analog IN+ and - or what to connect here?

Cheers
Bengt

P2 ANALOG IN
Connector P2 on the right side of the THCAD card is the analog input connector.
P2 is a six pin 3.5 MM right angle header with pins 2 and 5 removed to allow a long
creepage path for high voltage. A matching plug-in screw terminal block issupplied with
THCAD). P2 pinout is as follows:
PIN SIGNAL FUNCTION
1 IN+ Analog in +
2 XX Not used
3 SHIELD Shield gnd
4 SHIELD Shield gnd

5 XX Not used
6 IN- Analog in -

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18 Aug 2019 10:24 #142426 by rodw
Replied by rodw on topic THCAD
In my setup, the THCAD is in the control box so the shield on the interconnect cable is attached to one of those terminals and the other one is attach to a ground point in the control box.

I think in your situation, you would connect it to the plasma case or ground.

It would be interesting to dig up the photos Islander261 has posted of his setup with the THCAD mounted external to the plasma cutter.

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18 Aug 2019 10:46 #142428 by tecno
Replied by tecno on topic THCAD

I think in your situation, you would connect it to the plasma case or ground.


That is what I was tinkering around too but for me the text is a bit 'how do the say clear as mud' ;)

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18 Aug 2019 22:07 #142460 by robertspark
Replied by robertspark on topic THCAD
the shield connections are for the cable shield

analog- goes to the torch

analog+ goes to the work clamp

the shield allows for a noise screened cable to be used

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19 Aug 2019 10:03 #142481 by tecno
Replied by tecno on topic THCAD
OK.
Do you have any recommendation as regards a suitable shielded cable?

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19 Aug 2019 22:37 #142525 by tommylight
Replied by tommylight on topic THCAD
If the cable is short, you can make do without shielding.
In case you do need shielding, try to find STP CAT 5 or CAT 6 cable, used for ethernet networks, it is cheap and easy to find.
Not the UTP one, that is Unshielded.

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20 Aug 2019 10:21 #142570 by robertspark
Replied by robertspark on topic THCAD

tecno wrote: OK.
Do you have any recommendation as regards a suitable shielded cable?


it depends which THCAD you are using..... more importantly what voltage you are feeding it

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20 Aug 2019 10:29 #142572 by tecno
Replied by tecno on topic THCAD
300 and directly from outputs.

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20 Aug 2019 10:39 #142574 by robertspark
Replied by robertspark on topic THCAD

tecno wrote: 300 and directly from outputs.


I would be reluctant to use ethernet cable as it's voltage insulation rating is about 300v

www.google.com/search?safe=strict&client...0j0i8i30.h9cLZ5PPLJk

I have what we call SY and CY cable which is a braided cable like a steel wire armour cable but without the heavy guage shielding which is actually for mechanical protection.... I normally use 1mm2 or 1.5mm2 cable as the runs are not very long and the current is minimal for what I use it for VFD drives etc..... I just use an offcut

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20 Aug 2019 10:41 #142575 by robertspark
Replied by robertspark on topic THCAD
you could use two pieces of Ethernet cable as the voltage rating is core to core not cable to cable....

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