HELP! X just died and I don't know why.
- bottleworks
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12 Feb 2014 11:15 #43788
by bottleworks
HELP! X just died and I don't know why. was created by bottleworks
This is a manual mill which got converted to CNC and powered by LinuxCNC. Everything was fine until just an hour ago. It finished a part and when it homed back to X0Y6 for me to swap in the next item, I noticed it was ~0.020" off on X. I have an independent DRO on this machine which allows me to keep watch for any abnormalities. I went to jog it back to X0 and it started jumping around as seen in the video linked. I have connected the Y motor to the X motors harness and the results are the same (the video shown here is of the Y motor temporary connected to the X motor harness). I've attached a screen shot of the scope. I'm using a Leadshine driver for X. I suspect all these Chinese drivers are junk. Ive check the direction signal to the driver with a meter. In one direction, it's a constant 4.2V and in the other, it's a consistent 0V. Any thoughts and help?
The Youtube video is at:
The Youtube video is at:
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12 Feb 2014 17:15 #43797
by ArcEye
Replied by ArcEye on topic HELP! X just died and I don't know why.
Hi
All that remains is to swap the X motor across to the Y driver and wiring and for it to work properly and you have it conclusively.
I specify wiring, because it is just possible the problem is a connector or wire. Have a really careful look and put a meter on the lines whilst wiggling about.
I have never found a problem with Leadshine drivers, they are 'fit and forget'.
However there are genuine Leadshine, good copies and black boxes with similar writing on.
regards
All that remains is to swap the X motor across to the Y driver and wiring and for it to work properly and you have it conclusively.
I specify wiring, because it is just possible the problem is a connector or wire. Have a really careful look and put a meter on the lines whilst wiggling about.
I have never found a problem with Leadshine drivers, they are 'fit and forget'.
However there are genuine Leadshine, good copies and black boxes with similar writing on.
regards
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- bottleworks
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12 Feb 2014 17:46 #43800
by bottleworks
Replied by bottleworks on topic HELP! X just died and I don't know why.
This one is a genuine Leadshine. I had a Chinese copy (Longs Motors) originally on X, but one of the connectors started melting....In a way that you might first think it was due to a loose connection at the screw terminal. After further examination, the pin fit of the green connector was loose and caused excessive resistance, heat, then melting. So, I bought a brand-name Leadshine M860 from leadshineusa.com. That's the driver that appears to be having issues.
In the scope, doesn't the on-time seems really short?
One thing I can say for sure, I'm not cheaping out on the next conversion. I've got a BP Series 1 CNC that I'm next bring back to life. Just ordered a 7I76-5I25 PLUG-N-GO KIT an hour ago. I'm doing Gecko G203V drivers. (please let me know if you think I should choose different drivers). I'll be ordering those this afternoon. The chinese VFD has done well on the other, so I will reorder the same unit for this machine.
In the scope, doesn't the on-time seems really short?
One thing I can say for sure, I'm not cheaping out on the next conversion. I've got a BP Series 1 CNC that I'm next bring back to life. Just ordered a 7I76-5I25 PLUG-N-GO KIT an hour ago. I'm doing Gecko G203V drivers. (please let me know if you think I should choose different drivers). I'll be ordering those this afternoon. The chinese VFD has done well on the other, so I will reorder the same unit for this machine.
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12 Feb 2014 18:41 - 12 Feb 2014 18:42 #43801
by ArcEye
I couldn't really tell from that, I assume I am looking at X step?
I have always found it far more fruitfull to carry out thorough elimination tests using known good axes. In a few tests you can narrow down to the individual component if you are thorough and do not make any assumptions.
Connect the X output from the BOB to Y input. Y axis moves OK - eliminates any problem with X step generation and wiring to the driver. .. and so forth.
As far as Gecko's go, I have never used them, too expensive here, but they have a good name and you should get good after sales service if necessary.
Interesting desktop! Trying to work out if it is something real or a still from a game.
regards
Replied by ArcEye on topic HELP! X just died and I don't know why.
In the scope, doesn't the on-time seems really short?
I couldn't really tell from that, I assume I am looking at X step?
I have always found it far more fruitfull to carry out thorough elimination tests using known good axes. In a few tests you can narrow down to the individual component if you are thorough and do not make any assumptions.
Connect the X output from the BOB to Y input. Y axis moves OK - eliminates any problem with X step generation and wiring to the driver. .. and so forth.
As far as Gecko's go, I have never used them, too expensive here, but they have a good name and you should get good after sales service if necessary.
Interesting desktop! Trying to work out if it is something real or a still from a game.
regards
Last edit: 12 Feb 2014 18:42 by ArcEye.
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- bottleworks
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13 Feb 2014 02:50 - 13 Feb 2014 02:55 #43809
by bottleworks
That is the space shuttle discovery being taken to launchpad. I've attached.
Yes, that is my X step.
Replied by bottleworks on topic HELP! X just died and I don't know why.
Interesting desktop! Trying to work out if it is something real or a still from a game.
That is the space shuttle discovery being taken to launchpad. I've attached.
I couldn't really tell from that, I assume I am looking at X step?
Yes, that is my X step.
Last edit: 13 Feb 2014 02:55 by bottleworks.
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- Mike_Eitel
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14 Feb 2014 14:01 #43847
by Mike_Eitel
Replied by Mike_Eitel on topic HELP! X just died and I don't know why.
Hi
Fix direction pin to ground.
Still same problem.... Driver.
Regard ground cabling...
Mike
Fix direction pin to ground.
Still same problem.... Driver.
Regard ground cabling...
Mike
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14 Feb 2014 21:03 #43859
by andypugh
Replied by andypugh on topic HELP! X just died and I don't know why.
If one phase of the motor is burned out then I would expect it to just wobble in place, but it is just possible it might behave like that.
Have you checked the motor phase resistance?
Have you checked the motor phase resistance?
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15 Feb 2014 16:31 #43876
by bottleworks
Replied by bottleworks on topic HELP! X just died and I don't know why.
I'm back up! The machine went down just before all the snow, so I didn't touch it until a couple hours ago. I turned the machine back on and the driver faulted a couple times, but sometimes the motor would operate. Turned out to be a bad connection at a large Deutsch connector that interconnects signal & motors between the control cabinet and the mill. One of the phases was intermittently going open. When I checked resistance, it was making a good enough connection to not show trouble.
Thanks for everyone's help.
Thanks for everyone's help.
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