Nan - voltage

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6 years 1 month ago #183108 by rodw
Replied by rodw on topic Nan - voltage
The plasmac version of lowpass is configured quite differently to the genuine component. Take care if you do it externally.
I'm going to check my config tomorrow. It was drummed into me by Dewey Garrett not to filter a process control variable.
Something I see here tonight indicates I have something set here. If thats the case it must have been set by a plasmac default.

I don't know enough about electronics but i kinda agree with snowgoer something is not right. But remember we usually use the 1/32 of the thcad frequency. But then plasmac filters the voltage, not the frequency so there is another conversion.

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6 years 1 month ago - 6 years 1 month ago #183109 by Tesremos
Replied by Tesremos on topic Nan - voltage
see i interpretered it as, it will only read the voltage 25 times / second

oppopsed to 1.4million times...

ill swap out the low pass for the lowpass, and see if that makes a difference.

im wondering wat what stage it starts checking for voltage.

if on load it starts the "check voltage" loop, at the same time the lowpass has chosen Not to check voltage, there for resulting in a ... voltage is a non-value..

but,, this is way over my head/paygrade.

brings me to the .. if i load lowpass after plasmac...i wonder what happens.

ill poke the bear more tommorrow :)
Last edit: 6 years 1 month ago by Tesremos.

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6 years 1 month ago #183110 by phillc54
Replied by phillc54 on topic Nan - voltage
Lowpass after PlasmaC would affect only the displaying of the voltage.
I have another idea for you to try tomorrow.

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6 years 1 month ago #183111 by rodw
Replied by rodw on topic Nan - voltage

Tesremos wrote: see i interpretered it as, it will only read the voltage 25 times / second

:)


No the low pass filtered result will still be processed 1000 times per second as per the servo thread.

Be sure to read the docs and calculate the load to achieve your desired corner frequency.

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6 years 1 month ago - 6 years 1 month ago #183113 by snowgoer540
Replied by snowgoer540 on topic Nan - voltage

rodw wrote: I don't know enough about electronics but i kinda agree with snowgoer something is not right. But remember we usually use the 1/32 of the thcad frequency. But then plasmac filters the voltage, not the frequency so there is another conversion.


Sleepy Greg hadn't considered the 1/32 hardware divider. But that said, the frequency then would be 4375Hz to 31250Hz.

I thought we are filtering plasmac.arc-voltage, which is fed by the encoder.00.velocity pin?

EDIT: Fixed frequencies.
Last edit: 6 years 1 month ago by snowgoer540.

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6 years 1 month ago #183114 by phillc54
Replied by phillc54 on topic Nan - voltage

rodw wrote: Something I see here tonight indicates I have something set here. If thats the case it must have been set by a plasmac default.

The default is no lowpass filtering.

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