Hypersensing with THCAD - better way to do ohmic sensing

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5 years 10 months ago #193075 by Creative25
Great info.
I downloaded the firmware for the 7i76e from Mesa. There are mani filed.
The info I am missing is the File name of the firmware. I searched this forum but did not find anything. Which file do I need to load onto the Mesa board?

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5 years 10 months ago #193077 by rodw

Creative25 wrote: Great info.
I downloaded the firmware for the 7i76e from Mesa. There are mani filed.
The info I am missing is the File name of the firmware. I searched this forum but did not find anything. Which file do I need to load onto the Mesa board?


Use the file ending in pl.bit that suits the 7i76e

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5 years 10 months ago - 5 years 10 months ago #193081 by Creative25
Thanks I somehow do not fully understand.

On the Mesa webpage i downloaded the following file.
7i76e.zip

It contains a folder called Config
Inside there is a folder called hotmot2

This folder does not contain a file ending pl.bit

The closest I can find is

7i76e_7i76x1_Dpl.bit

Is this the file I should flash on my mesa card.

Or has the correct file a new name?
Last edit: 5 years 10 months ago by Creative25.

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5 years 10 months ago #193116 by PCW
That is the file for a 7I76E for plasma with 3 'A' encoder inputs
to support up 3 THCADs
The following user(s) said Thank You: rodw

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4 years 5 months ago #243608 by Marçal
Hi! I believe this is the proper thread to post this. As I said in previous posts I don't know much from electronics, so, sorry about that in advance. I am trying to implement a ohmic sensing system and a THC in a 3 axis plasma cutter machine. Before wiring the THCADs everything worked fine. In another thread I created Peter told me it looks like I have a power problem. However, I don't know how to find it. I draw a scheme. I tried to follow the PlasmaC guide, the forum and the Mesa manuals.
I have attached the wiring scheme from the last part, when everything started to fail, plus the report, the ini and hal files. 
I checked the hal code I copied from the plasmaC guide and there are some measurement that I am not sure how to find. They are in bold text:
setp ohmicsense.thcad-0-volt-freq    140200
setp ohmicsense.thcad-max-volt-freq  988300
setp ohmicsense.ohmic-threshold      22.0
setp ohmicsense.ohmic-low            1.0

Can someone help me to find what I am doing wrong, please?
Thank you

 

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4 years 5 months ago #243634 by rodw
The frequencies come from the sticker on the THCAD x 1000 (convert kHz to Hz)
The voltages thresholds are where the probe signal turns on (at 22 volts) and off (at 1 volt) in your example
You can watch a probing event in halshow (or use the probe test) to see the maximum voltage in your setup on the ohmicsense.ohmic-volts pin.
The ohmic-threshold needs to be a couple of volts below that voltage.
If your frequencies were wrong and the calculated voltage was below the threshold of 22 volts it will never trigger.

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