Dynomotion

Group: DynoMotion Message: 10986 From: melling_paul Date: 2/2/2015
Subject: Kanalog/Gecko/Glass Scale Noise
I am hoping I might get a suggestion on how to fix a problem I've been having.  My kflop/kanalog is working great with gecko drives.  However I am trying to configure the closed loop function with glass scales.  I am getting a good signal from the scale, when I move the axis by hand the numbers change like they should, see the pictures.  When I plug in the motor, and try to run the step response, the numbers go crazy.  I am assuming this is electrical noise, so I rewired everything, moving the driver, power supply and vfd farther away form the kflop box and replaced unsheilded cables with shielded ones.  Is this what the IIR filters would be used for?  They don't seem to make any difference.  Has anyone run into this problem, I can't seem to find much information it.  Any help would be great.  Thanks, Paul
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Group: DynoMotion Message: 10989 From: Tom Kerekes Date: 2/2/2015
Subject: Re: Kanalog/Gecko/Glass Scale Noise [2 Attachments]
Hi Paul,

What kind of encoders do you have and how/where are they wired?  A common User mistake is to wire single ended encoders to differential encoder inputs.  See:


Regards
TK

Group: DynoMotion Message: 10993 From: melling_paul Date: 2/2/2015
Subject: Re: Kanalog/Gecko/Glass Scale Noise [2 Attachments]
That's it!  Thank you, thank you, thank you!
Group: DynoMotion Message: 10994 From: ricochetproducts Date: 2/2/2015
Subject: Re: Kanalog/Gecko/Glass Scale Noise
What was it?  How did you fix it?
Group: DynoMotion Message: 11001 From: melling_paul Date: 2/2/2015
Subject: Re: Kanalog/Gecko/Glass Scale Noise
turns out my scales are single ended, I thought they were, but then I read they are differential.  I installed the line drivers I got when I thought they were single ended and that fix it. 
Group: DynoMotion Message: 11002 From: melling_paul Date: 2/2/2015
Subject: Re: Kanalog/Gecko/Glass Scale Noise
I first thought my scales were single ended and purchased some line drivers, then I read online that my scales were differential, so I connected them without the drivers.  Today I called dro pros to make sure I knew what kind they were, turns out they are single ended, hooked up the line drivers and it works great.
Group: DynoMotion Message: 11010 From: Steve Klemp Date: 2/3/2015
Subject: Re: Kanalog/Gecko/Glass Scale Noise
What kind of glass scales do you have?  Do you have a link for them, How about the line drivers, Any info on them?  I have been trying to use glass scales in my application and cannot get them to work properly. They are single ended and I have tried to use line drivers purchased from CNC4PC CNCdrive - motion controls
 
 For now I am using USDigital encoders mounted to the back of my servos.  They work good but I would like to use the Glass Scales. I have a Bridgeport Mill. Encoders are on the X - Y Axis & Quill. I want to be able to monitor the knee position (Glass Scale) on the KMotion screen. 
Sorry for all the questions,  There just isn't to much info out for this. (that I can find)
.....Steve
            
 

From: "melling_paul@... [DynoMotion]" <DynoMotion@yahoogroups.com>
To: DynoMotion@yahoogroups.com
Sent: Monday, February 2, 2015 8:16 PM
Subject: [DynoMotion] Re: Kanalog/Gecko/Glass Scale Noise

 
turns out my scales are single ended, I thought they were, but then I read they are differential.  I installed the line drivers I got when I thought they were single ended and that fix it.