Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: golash on February 21, 2008, 06:37:08 PM
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Hi
I started mach3 and the machine. As soon as the power was on to the system. All axes took off on their own. I just did
a mach3 driver test and it seems to be fine. How to I fix this problem. I`ve been using the machine with no problems for a long time
without problems.I`m using machh3 version 2.6. I`m also using the sound logic encdoer interface for servos on my machine. Also, no
changes have been to the xml config files or any modifications to the wiring of the system. It would be great if I could troubleshoot
the control panel with system powered up. That`s a bit difficult to do when the power is applied and all axes want to crash into the
machine frame. Sometimes this DIY stuff is a big pain in the ass.
Barry
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remove the motors from the machine then you can power up and trouble shoot.
What type of testing gear do you have? ie do you have a scope? a voltmeter?
Hood
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Hi Hood
That`s a very intelligent answer. This problem made me so mad I can`t think straight.
I have both testing devices. Problems are the biggest pitfall with DIY CNC . There
are limited troubleshoot tips from some of the retailers of these products. I do have a difficult time
troubleshooting circuits that I have no idea how they work. Am I wrong here.
Some of the people that sell their boards have great troubleshooting help. And other
retailer have no troubleshooting information. It seems everyone`s lives would be easier if
thses products have more info provided at the site from which these products are sold.
Thanks alot
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first thing I would check is that the paralell port isnt putting out a constant stream to all axis. That will eliminate either your control harware or your computer from the fault finding depending on the results.
You can use a scope or the voltmeter for that, scope being the best.
Hood
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if you have servos, and your encouder feed backs may make your motors fly off.
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Hi, Barry
Sounds like you've lost the 5 volts to your encoders, If you haven't changed any thing, That's the first place to look.
Disconnect the pos. leads to ro your servos or uncouple them from driving your axises.
Some servo controls will runaway without the A/B encoder feedback.
Its smiler to having the polarity backwards on a servomotor in relationship to the encoder feedback, The more the motor/encoder turns the more the feedback/error it gets and the faster the motor turns, But in this case the encoder count limit will usually trip the servo control.
Hope this Helps, Chip
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I'm interested in seeing which one of you get's the $$ first! ;D
Never had servo's but my immediate thought when I read the description was no encoder feedback.
Mike
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Hi, Barry
You never!! responded to the help "start" hear, Starting a new Post isn't going to fix it !!
Sounds like you've lost the 5 volts to your encoders, If you haven't changed any thing, That's the first place to look.
Disconnect the pos. leads to your servo motors.
On your Gecko's, Check from Gnd to Encoder + terminal for 5 volt's, If you don't have power to the encoder's it's not going to work.
If the encoder's have power, Check the A & B encoder terminals on the Gecko's, Gnd to A & Gnd to B for 5 volt's then 0 volt's by turning the servo shaft
slowly, If thy are both good, Swap the A, B, encoder wires around, Reconnect the pos. lead to the servo motor and re-set it, Should lock-up and hold
position. Turn the power off when connecting or disconnecting wire's.
Thanks, Chip
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The offer of a "million" sure did the trick !!!
I've never seen as many orange and red flashes on a post in such a short time - or were we all having a weekend on the computer.
As long as this post isn't a reply to "prices for one on one technical support" :D :D :-\
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Hi
DC was working after I found a connection I must have bumped. I now have 54 VDC to the geckos.
I did a test of the encoder A and B referecing from the - encoder on the G320. I see a reading of 5.2 volts
I checked the Ground to 5 volt on the plug end at the encoder I see 4.9 volts
Note: Removed encoder interface card`s parallel cable from the machine. And the result
was the X axis does not runaway and I have a normal servo noise. If I attach both encoder
and breakout parallel cables I have a runaway.
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Hi, Barry
Give us a list of the boards/cards your using.
Thanks, Chip
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Hi
The breakout board is bob campbells version 1.8 ...I believe. And also a sound logic
encoder interface board sold by rogers machine. Both boards require a parallel port
cable. The Geckos are G320 and they run on a 53 volt supply. The encoders are E2
250 line US Digital devices.
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Hi, Barry
May have a bad xml file.
Look in C:\Mach3\xmlbackups folder, It has backup xml's, Sort it by Date, Make a copy of the one that is just before the date you started having trouble.
Past it in C:\Mach3\ folder, Then re name it th Mach3Test.xml and load it, Give it a try.
With the boards your using there are a lot of special settings, It's probably the encoder interface board's settings your missing.
Thanks, Chip
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Are you using 2 parallel ports, if so, is the second one configured for just inputs?
Graham.
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One parallel port controls the breakout board and the other controls the encoder interface card
Barry
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I tried a older xml . I still have the same runaway condition.
Hi, Barry
May have a bad xml file.
Look in C:\Mach3\xmlbackups folder, It has backup xml's, Sort it by Date, Make a copy of the one that is just before the date you started having trouble.
Past it in C:\Mach3\ folder, Then re name it th Mach3Test.xml and load it, Give it a try.
With the boards your using there are a lot of special settings, It's probably the encoder interface board's settings your missing.
Thanks, Chip