Thank you for your support to SteelTailor, the reasons that THC goes up is the THC can’t receive the right arc voltage signal, you should check as below:

1. Check if you connect the DIV ARC+&DIV ARC- in wrong direction, so you can exchange the two wires to test, if this doesn’t work, see the step 2.

2. Do you connect the raw arc voltage signal to DIV ARC+&DIV ARC-? It should be between 50v-300v, some plasma give out divided arc voltage, if you connect this to our machine, the THC will always go up.

3. I the two steps above can’t resolve your problem, you should test if the terminals which you connect the DIV ARC+&DIV ARC- are right. The terminal which you connect to the DIV ARC+ should be conductive with the electrode, and the terminal which you connect to the DIV ARC- should be conductive with the metal plate that you want to cut, you can use a multimeter to test, if not thus, please check if you connect to the wrong terminals.

If your problem persists after you do all the steps above, please give more detailed information to us, we will help to find out the reason.