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« 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
Error: FTDI USB DRIVER ERROR
ERROR = FT_IO_ERROR
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.
Thanks