Advanced Search

It looks like 7I76E+7I77 firmware, but would need to see the pinout section to be sure

   
that pulled up everything about it, but I didn't see the firmware version
See pic.

A CNC4PC C10 (that the OP used) is probably a good choice as its an all 5V BOB.

Now it's working and stable!
Thank you for your work, it's awesome that we can use this cheap controller, we had a lot of problems with Mach3.

Hi,

Made a even bigger example how linuxcnc primairely works with rtapi and hal.

Why do we made this example?
Primairely to get more insight's how rtapi loads rt modules, how hal is used and how to setup hal environment.
How to connect hal pin's to each other, and how they are updated.

Specs:

- loading multiple linuxcnc instances. (function loader instances)
- Choose the cpu's to clamp on.
- Set prioriy
- Create multiple shared memory regions.
- Update hal pins over different shared memory regions.
- Create and update hal connection's like "net", but then also connect structure types.

example

Then i looked into the hal ethercat component code, and indeed, above code could implement
a edited version of the hal ethercat code.

You need to provide the cards IP address:

mesaflash --device 7i76e --addr 10.10.10.10 --readhmid
or
mesaflash --device 7i76e --addr 192.168.1.121 --readhmid

7i76EU would be fine too. ok, in this case i can wait and order if they are back in stock

I put in
mesaflash --device 7i76e --readhmid

it said 'no 7i76e board found
I just got called out on a service call, so have to go, unfortunately.

should i get another bob? and if so what would you recommend?

Unfortunately it would be pretty awkward with those breakouts as the inputs
are slow 12V signals. Even with level shifting I don't know if they could deal
with the ~8KHz signals from the THCAD using the highest divider ratio (128)

The breakout board inputs are activated by grounding so you could try adding
a NPN transistor/small MOSFET to do the level translation from the THCADs ~5V signals
to the 12V required but no guarantees...

A better solution might be to drive the appropriate 7I92 line directly (with maybe a 100 ohm
series resistor for safety)

Problem solved.
The original display card is VisionTek Radeon 5450 2GB DDR3 (DVI-I, HDMI, VGA) (fanless) $63, bought in Aug 2023. I used a dedicated Noctua 92mm fan to cool it.
Today I buy a new no brand HD7000 display card (HDMI, VGA) (with fan cooling) $13 to replace the old one, no error message when running LinuxCNC now.
Thanks for tommylight much.

try mesaflash --help
 

If you are going to do this (I wouldn't) Make sure your divider resistors are rated for the voltage
and the power. This is difficult as 25KV times 5 mA = 125 W! (this is assuming a THCAD2 jumpered for
5V input and an external 5M resistor)

You can get away with a smaller watt rating because of the "peaky" nature of the HF signal
and it's short duration, but I would not skimp on the voltage rating. I would use  (5x) of
something like this as a minimum:

www.digikey.com/en/products/detail/visha...0001004FAC00/1994729

Because the voltage spikes are mainly in the negative lead,, I would put 4 resistors in the negative lead
and 1 in the positive lead. This combination will (with THCAD2 set for 5V) give a full scale voltage of 255V
 

Ok. I put man mesaflash in terminal and it came back with 'no manual entry for mesaflash.
I believe there is a sudo command to ask what the board information is, but I can't remember what it is.

The proper way would be to wire it to the rectifier output, and use 2 of 1.5Mohm resistors on each wire.
To answer your question, yes HF start can kill the THCAD, but... i have a THCAD10 wired through 2 of 1Mohm resistors at the plasma plugs, plasma is China made Kzubr 60A, it is HF start, it is in use for over 6 months i think, it did not die, yet.
Do this at your own risk, it is not recommended but it works.
Use 2 resistors, 1 on each wire, this is very important, short wires from plasma to resistors, no more than 20-30cm, keep those wires and resistors at least 10cm appart or mount the THCAD close to the source.
And, torch is not positive on plasma, it is negative, the clamp is positive.