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Author Topic: Help setting up my electronics - noise problems - SOS!  (Read 2662 times)

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Help setting up my electronics - noise problems - SOS!
« on: January 28, 2012, 08:51:57 AM »
 Hey guys,

I'm having some problems setting up my electronics. The configuration is: SS, C11G,  G320X, KL2200 spindle, keling VFD22, 72V 20amp power supply.
I've pre assembled everything on a MDF sheet, just for testing the motors, drivers, bob and VFD. Everything seemed to be fine on these tests.  I could even  calibrate the spindle and the VFD  didn' t cause any interference that I could notice. 
Now my machine is assembled and I started to wire limit switches and everything else for testing. I could tune motors and put the limit switches to work, but when I tried to run the spindle the system crashed. As soon as I gave a M3S*********x command I got the following message:

Error returned from USB function FT_write


Bytes requested: 192
Bytes written: 0

I couldn't run the spindle for 1 second cause in the moment the CW relay turned on, the SS crashed. When this occurs the red led on the SS stops to blink and I need to switch it off and restart Mach3.
I unpluged the spindle cable and gave the M3S*********x command again and got no problem, so the VFD itself is not causing the noise to SS board. I figured out that the spindle is causing the noise, somehow it is throwing interference through its cable.
I'm powering the analog 0-10v spindle speed control with an ATX power supply that I took from an old computer. The C11G was being powered with a 5v regulated power supply, so I tried using the 5v output from the ATX instead and got the spindle to run, but still crashing after a while. 
After all the testings I presume it is a grounding problem and need help solving this. 

Does anyone experienced this ?
I've read somethings about ground loop but I don't know much of electrical theory. Can someone explain me what it is, how it occurs and what should I do to avoid it?
Which is the best way to ground everything?
I've disabled the mechanical limit switches because I think they were making things worse. Is there a way to ground or shield them against noise?
Does anyone know if a wrong wiring of the UVW inputs on the VFD could cause noise issues?

Please someone help me! I really need to get my machine to work. 

Re: Help setting up my electronics - noise problems - SOS!
« Reply #1 on: January 28, 2012, 03:26:27 PM »
You should check index debounce setting in the general config (set to 1000) try that.
Re: Help setting up my electronics - noise problems - SOS!
« Reply #2 on: January 28, 2012, 08:45:02 PM »
Hi Billbob,

Thank you for your answer. I'm using a smooth stepper board combined with a C11G. There are some settings for debounce on the smooth stepper plugin control, but can you tell if it works together with mach's debounce settings or does the SS ignore it?
Re: Help setting up my electronics - noise problems - SOS!
« Reply #3 on: January 29, 2012, 10:06:15 AM »
Hi Murilana
I think it has to do with Mach3, on my lathe I had to have a setting of 1000 on Debounce Interval and on my Mill I used 100 on each setting.
With out any setting as soon as the spindle would turn on Mach3 would reset.