Can anyone help?
Hi - I am a relative newbie to CNC. I have a good solid quality mill that I bought about 5 yrs ago to make model aircraft moulds. It has a UCCNC ETH-300 motion controller, CNC4PC C23 breakout board, G320X Gecko drives, Fuling dzb200b002.2l2dk VFD inverter, servo drives and ball screws on linear rails.
This problem happened a couple of times and was rectified with a restart, but yesterday I was jogging it around preparing for a job and seems to now be permanent.
The problem is that the servos won't stay on at all. When I start the machine and then press the servo start button, you can hear the servos chatter while I'm pressing the button but they shut off immediately I let go of the button.
Looking at the Gecko drives, the power and fault lights are lit on all 3 drives. "In Pos" and “Warn" lights are not lit. I can't see any other errors anywhere.
Normally I'd contact Justin at Vermec, where I bought the machine and he'd probably diagnose it in a few minutes, but he's away and uncontactable.
Any tips on where to start?
Thanks,
Andrew
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Can anyone help?
There may be a fault on one drive, and they are wired so that the one is faulting all of them. It's going to take some troubleshooting, with detailed knowledge of how it's setup.
Gerry
UCCNC 2017 Screenset
[URL]http://www.thecncwoodworker.com/2017.html[/URL]
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JointCAM - CNC Dovetails & Box Joints
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(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
Hey Gerry, thanks. I have been busy but got time to have a look at it again this afternoon. I disconnected the Z gecko drive, and the X and Y drives fired up normally so I thought yay, it’s all due to a dud drive - expensive but at least an easy diagnosis. I shut it down again and plugged the Z gecko drive back together and restarted it all to verify that it caused it to all fault out, but it didn’t! It all works fine. So it’s an intermittent fault. That’s consistent with the recent history … it actually shut the drives off a couple of times in the previous week, and it came good with a bit of fiddling. This last time it seemed permanent but now it’s back to working. So I'm none the wiser really.
A
The problem sounds like it may be an encoder issue. If you remove a motor from the machine and bench test it does it continue to show a FAULT state at all times? You will need to reset the drives on power up by connecting terminals 5 and 7 for five seconds. Did you tune the PID trimpots when you first set the drives up?
Marcus Freimanis
www.geckodrive.com