Analog Servo runs at maximum speed at start

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27 Oct 2020 18:26 #187451 by tommylight

honestly it looks a bit like Coca-Cola...

Bumped into that issue back in 1991 !

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27 Oct 2020 18:58 - 27 Oct 2020 19:00 #187454 by aleksamc
So I need to try to wash that by water? I will try it tomorrow.
If it will be clean than it will work fine or I need to renew with new solder?
As for me I didn't have Coca Cola in the house for a year at least, so it's not me. Board was in packet from time I received it to be installed.

As for me, it's look like it was resoldered manualy.
Last edit: 27 Oct 2020 19:00 by aleksamc.

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27 Oct 2020 19:08 #187456 by PCW
I would try washing with water, if it washes off in water, its some kind of water
based material which will cause leakage and eventually corrosion. In this case
it would be best to wash the entire board and brush the contaminated
area with something like a toothbrush. If its an oily material, I would use
some detergent in the water. and the rinse many times until the detergent
is gone. When clean I would dry in a 65C oven for a few hours.

If its flux (which would be odd since I have never seen card from out assembly
house with a large amount of flux residue) that should not be harmful but can be
cleaned with isopropyl alcohol
The following user(s) said Thank You: aleksamc

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29 Oct 2020 18:28 #187707 by aleksamc
I washed it with vodka (40% alcohol, 60% water).It washed nice but one capasitor came off (second from left).I saw that there very-very small pad, like dot. I have soldering station so I soldered it back. I cleaned flux as best as I could.After washing: After resoldering one cap



Not the best resault. I checked if capsitor have electrical contact and assembled it back on machine.Now chanel works very nice. It tried run on cold, it works very good. I will try after few days one more time to start on cold if it doesn't change it's quality.
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29 Oct 2020 18:40 #187708 by Mike_Eitel
Good proof that russian vodka is a versatile tool. ;-)

Not only when it's freezing cold....
Like it was when we have been scubadiving in Petropawlowsk.
Mike

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29 Oct 2020 19:04 #187711 by aleksamc
Currently, this was german shnaps)))
But they are the same.

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10 Dec 2020 09:09 - 10 Dec 2020 09:45 #191573 by aleksamc
OK, I found That 24V Power Supply is not worken

I have some brake in working with cnc machine.It was stopped and turned off.Today I turn it on and get errorERROR: Pin 'hm2_5i25.0.7i77.0.0.output-01' doesn't existWhat problem could be in?I tried to set it tighter bot same resault.Supply is added t0 7i77 board.Log of error when I start linuxcnc

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File Name: linuxcnc.txt
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Information from MesaFlash

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File Name: pinout.txt
File Size:5 KB
PSCable connected to Mesa, not to Parallel Port.

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Last edit: 10 Dec 2020 09:45 by aleksamc.

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06 Feb 2021 07:47 - 06 Feb 2021 07:56 #197811 by aleksamc
It seems that I have one more problem that I can't solve with configuring my axis.

Previously I had problem with chanel.0 in this topic.

Now I have problem with chanel 1 (axis Y).
I add transitional process graphs.
I must say that I decreesed P-gain to very slow value.
Also previously I supposed that mechanic is problematic, because belts are move this axis And I supposed that it's very springin. I add one more mechanical joint to stabilize it. But it doesn't solved my problem complitly.

What do you think about this transitional process, PCW?
Other axis X also has belt joints but it's fine now.

I change analog chanel to another to check if problem not in MESA, but it doesn't changed anything, so MESA chanel is good
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Last edit: 06 Feb 2021 07:56 by aleksamc.

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06 Feb 2021 15:27 - 06 Feb 2021 15:27 #197836 by PCW
Are the encoders on the motors or the ballscrews?
If you get oscillations with very low (or even 0) P gain,
you probably need to tune the velocity loop on the drive

With halscope pictures, can you take a screen shot rather than a picture
and include the halscope settingspart of the image so that the oscillation
frequency can be determined.

It would also be helpful for diagnosis if you showed the current PID parameters
associated with halscope images
Last edit: 06 Feb 2021 15:27 by PCW.

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06 Feb 2021 18:21 #197859 by aleksamc
Thanks, PCW for your answer.
With changing of servodrives I defined that this one was bad.
Also I saw that P=0.003 for another servodrive give much better results (previous value was P=0.08)
I think this problem is solwed.

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