Esab Ultrarex UXD-P2000 Upgrade Project

This is all good. We keep the existing z axis.
So I need help with the shopping list please:
- PC and monitor => Ready.
- Mesa 7i77 => I see two versions on eusurplus site:
- MESA 7i77 Analog servo interface plus I/O daughtercard - sourcing output version
- MESA 7i77D Analog servo interface plus I/O daughtercard - Sinking output version
- THCAD => I see 3 models on eusurplus.com => THCAD-5, THCAD-10,THCAD-300.
Which one is ok for me?
From eusurplus site:
The THCAD is available in two voltage ranges, 0-10V and 0-300V. When used for plasma voltage monitoring, the 10V version requires an external high voltage resistor. The advantage of the 10V THCAD and external resistor is that the resistor can be selected to work with high-frequency start torches. The 300V version of the THCAD has all input divider resistor on board and can connect directly to the plasma voltage of touch start type torches only
- 2X small 24V relays => I will look them up but if you have a link would be great if that's not too much asking
- Sensor => Any additional info? Link please
- 1 Encoder => Any additional info? Link please
- 1 Drive => Link please. I see what that is now. What are you using on your machines.
- CAT6 cable
- DVM => available

My friend will keep the max200 because he is not sure his small plasma will handle the esab machine once he starts using it. He will start with his small cutter and see if that work out well.
My friend would also like to upgrade the plasma 'head' as esab told him there are no spare parts available for this part. What do you think? Did you keep that part?

List without text:

- PC and monitor
- Mesa 7i77
- THCAD
- 2X small 24V relays
- Sensor
- Encoder
- Drive
- CAT6 cable
- DVM

This is the small plasma cutter he has wired to the esab but not yet used.

Great. We are getting there. Let me update the list and see if I have all the components.

- PC and monitor => OK
- Mesa 7i77 => OK
MESA 7i77 Analog servo interface plus I/O daughtercard - sourcing output version
eusurplus.com/index.php?route=product/pr...ct_id=51&search=7i77
- THCAD => OK
THCAD+300
eusurplus.com/index.php?route=product/pr...=53&search=THCAD+300
- 2X small 24V relays
24v-DC-Coil-General-purpose-Relays-8-Pin-with-DIN-Sockets-DPDT-5A-MY2NJ
www.ebay.co.uk/itm/24v-DC-Coil-General-p...A-MY2NJ/163150100577
- Sensor: Missing
- Encoder => OK
Rotary-Encoder-400P-R-6mm-Incremental-Optical-Shaft-Working-Measurement-5-24V-S2
www.ebay.co.uk/itm/Rotary-Encoder-400P-R...-24V-S2/233439617211
- Drive: missing
- CAT6 cable => OK
- DVM = > OK

I'm still missing two items from the list, the sensor you mentioned in your initial list and the drive part.
I picked a random encoder from your list. Items are not expensive so once we get the machine running I can upgrade or replace if needed. Am I ok or do I have to mach the encoder specs with the epcs of the esab machine?
I also picked a random relay.
I understood I need a single encoder, right?

So I'm keeping the original drive and putting the encoder on top of it. I'm still doing some reading
And I don't need the sensor.

I see in your UXD-P2500 retrofit thread that you used this config:

I used the old servo motors and drives, limit switches, E-stop loop, most of the wiring

added
a 6i25 and 7i77, new PC with monitor, power supplies, added a stepper motor and drive to one of the Z axis ( has 2 Z axis ), a Proma THC150.

Do I need one or two Mesa cards for the P-2000.
I'm adding the schematics so you see what I'm sealing with.

Files were sent by my friend over whatsapp so quality is not that good. I'll do a proper scan later.
There are the schematics he has of the UXD-P2000.

And this one is for the HyperTherm Max200.