Probe Basic spindle load bar off by a decimal

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06 Sep 2022 23:01 #251364 by masterjuggler
I've got my spindle VFD controlled by an rs485 usb dongle. Looking at halshow, I get the correct current draw reported, and Probe Basic's load bar seem to properly reflect the current draw as a proportion of the max current I have set with the qtpyvcp.spindle-load-indicator.max-val signal. For some reason though, the percent shown seems to be off by a factor of 10. When at about 50% load it shows me 5%. Is this something I have misconfigured?

 

I attached my custom_postgui.hal showing how I have that configured. I'm using the latest master branch, compiled from source, and LinuxCNC 2.9 master.
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07 Sep 2022 00:43 #251371 by Lcvette
Looks like you set max value to 9, that should be the max value percentage you are going to use. 

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07 Sep 2022 01:20 #251375 by masterjuggler
I set it to 9 because I have the VFD set to max out at 9 amps. Changing the value to 100 doesn't change the displayed percentage at all, but it does change the bar's scale. So now when the FVD pulls 6 amps, Probe Basic shows me 6% and the bar barely moves.

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07 Sep 2022 01:26 - 07 Sep 2022 22:14 #251376 by Lcvette
You need to add a scale for the vfd output. And translate it to the range you want to use. The max value your changing is for the max percentage display range of the bar, most will run 150-200% to allow for short term over loading which many drives allow for. You need to scale the analog to match that percentage your drive allows for.
Last edit: 07 Sep 2022 22:14 by Lcvette.

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07 Sep 2022 01:35 #251377 by masterjuggler
OK, I see what you mean. Could I ask for either an example or a link to one so I can see how it needs to be set up? I'm unsure how to go about scaling the analog.

When I was running LinuxCNC 2.8 and Probe Basic from the installer, I had it set up with the Hal I attached above with the value set to 9 and it figured out the scale. I guess the behavior changed somewhere along the line.

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07 Sep 2022 01:49 - 07 Sep 2022 01:50 #251378 by Lcvette
setp hm2_7i76e.0.7i76.0.0.analogin0-scalemax 363

Taken from here:

forum.linuxcnc.org/22-pyvcp/39322-scaling-an-analog-value
Last edit: 07 Sep 2022 01:50 by Lcvette.

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07 Sep 2022 02:12 #251382 by masterjuggler
Maybe I'm misunderstanding, but that seems to only work for an analog signal. As mentioned, this current draw signal is from the rs485 interface. Trying to use the -scalemax suffix on spindle-current just causes linuxcnc to error on launch due to not recognizing that pin.

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07 Sep 2022 02:58 - 07 Sep 2022 22:15 #251385 by Lcvette
ive never done it that way, so am not of much help, but i would imagine there has to be some method to scale that input in a similar fashion.  what does your rs485 file output look like? perhaps either in that or if you have it in your hal somewhere you could scale where it is pulled in?
Last edit: 07 Sep 2022 22:15 by Lcvette.

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07 Sep 2022 03:24 - 07 Sep 2022 21:19 #251386 by TurBoss
hello,

to convert AMPS to load percent we have this halc-omponent (attached)

to install it, just run

halcompile --install load_conv.comp


then in the hal file


loadrt load_conv

addf load-conv.0 servo-thread

net spindle-current => load_conv.0.amps
net spindle-load qtpyvcp.spindle-load-indicator.in-f <= load_conv.0.percent

I'm writing this form memory i don't have the config that uses it arround
please post any issue

Thanks

edited: many many typos and erros thanks masterjuggler
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Last edit: 07 Sep 2022 21:19 by TurBoss.
The following user(s) said Thank You: Lcvette, masterjuggler

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07 Sep 2022 20:28 - 07 Sep 2022 20:34 #251436 by masterjuggler
Perfect, I got it working. Thanks so much @TurBoss, and I appreciate the help @Lcvette.

Few things to note to help anyone else who may stumble on this info:

1) The compiled file saved to /usr/lib/linuxcnc/modules is named load_conv.so, and it must be loaded into the hal as load_conv. However, the pin added with addf must be load-conv, with a hyphen instead of an underscore.

2) The resulting pins are load-conv.0.amps and load-conv.0.percent, as I discovered in halrun by loading load_conv and showing the available pins.

3) Before compiling, I first changed the denominator to 0.09, since I have the VFD set to a maximum of 9 amps.

I also attached my working custom_postgui.hal.
Attachments:
Last edit: 07 Sep 2022 20:34 by masterjuggler.
The following user(s) said Thank You: TurBoss, Lcvette

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