Re: [CAD_CAM_EDM_DRO] Re: BP retrofit yaxis drive burnup- follow-up

Jeff Goldberg wrote:

>Guys,
>
>There are a few things which might be causing this. Somehow, you seem to be
>sending too much current through the drive. I think that if the problem was
>on the power supply side, you'd blow the fuse, but I suspect that it would
>be hard to damage the drive. Also, it's unlikely that both of you have
>identicle motor problems.
>
>I think that this points towards either of two things. First, if the motor
>is somehow turning into a generator and back-feeding into the drive in a way
>that it's not protected and causing a failure which looks like a short to
>

No , because both of us have found the drive dead when the machine was
first started not while running .

>the input. This in turn causes the input side fuse to blow. The second
>possiblity is something fluky with the grounding which is throwing things
>out of wack. While the blowing of the fuse is a current actuated event, an
>over-voltage somewhere may be what's responsible for blowing the device,
>which in turn is causing the short allowing too much current to flow.
>
>These are idle speculations by a guy who knows little. You might want to
>ask Marris what he thinks before you spend a lot of time and effort "curing"
>the wrong problem.
>
>Hope the above helps you locate the issue. I'd be curious what you find
>out.
>
>Jeff
>
>
>
>-----Original Message-----
>From: Ron Kline [mailto:godsone@...]
>Sent: Friday, April 08, 2005 6:01 PM
>To: CAD_CAM_EDM_DRO@yahoogroups.com
>Subject: Re: [CAD_CAM_EDM_DRO] Re: BP retrofit yaxis drive burnup- follow-up
>
>
>
>
>Keith Clark wrote:
>
>
>
>>Ron, we need to compare notes to see if there is a common pattern.
>>Mine takes some time to burn also, but I hope my problem was having
>>the relay to turn off and on the power supply on the DC side instead
>>of the AC side.
>>
>>
>>
>
>Mine was wired just like the schematics show with a very normal low tech
>power supply and all wiring in flexible conduit .
>I'm hoping that my motor was the problem .
>Mauriss is coming out this month with "unkillable" drives that he calls
>Vampires (note the connection ) and I will get one of them for this
>motor as soon as his production drives come in..
>This will solve this problem of the big 42 size motors killing the drives
>
>
>
>
>>Now I can't get the x axis to move properly... I
>>am going to drop to half winding
>>
>>
>>
>
>I'm also running the windings in series ,wonder if that is a
>contributing factor ??
>
>
>
>
>>mode and lower current to see if
>>that helps in the long run.
>>
>>Keith
>>
>>--- In CAD_CAM_EDM_DRO@yahoogroups.com, Ron Kline <godsone@e...>
>>wrote:
>>
>>
>>
>>
>>>Hi
>>>Be sure to let us know how it holds up later , I chickened out and
>>>replaced my motor and the burnt out Gecko hoping that it was the
>>>
>>>
>>>
>>>
>>motor
>>
>>
>>
>>
>>>that has been burning out my 201s . The scary part is there is no
>>>
>>>
>>>
>>>
>>way to
>>
>>
>>
>>
>>>know and the drives get expensive .
>>>I have been running it for 2 days with no problem but in the past
>>>
>>>
>>>
>>>
>>it has
>>
>>
>>
>>
>>>taken several months for it to blow .
>>>
>>>Keith Clark wrote:
>>>
>>>
>>>
>>>
>>>
>>>>I'd like to give some follow-up on the complete reworking of my
>>>>
>>>>
>>>>
>>>>
>>BP
>>
>>
>>
>>
>>>>retrofit. I was burning up Geckos on the y axis. The installer
>>>>originally put in everything on top of all the original BP CNC
>>>>equipment. I gutted the cabinets and rewired everything. Just
>>>>
>>>>
>>>>
>>>>
>>tried
>>
>>
>>
>>
>>>>out the machine and everything works almost. The relay for the DC
>>>>powersupply that had been on the DC side got switched to the AC
>>>>side. With switching on the DC side there was always a "bump" of
>>>>the motors and the backup powersupply for the computer sensed a
>>>>spike and briefly shutdown. Now with the AC side switched there
>>>>
>>>>
>>>>
>>>>
>>is
>>
>>
>>
>>
>>>>no bump. Hopefully the electrical problems are behind me except
>>>>
>>>>
>>>>
>>>>
>>for
>>
>>
>>
>>
>>>>the fact that the x axis will not run smoothly. It stalls unless
>>>>tuned for very slow speed. The y and z axes run at top speed and
>>>>acceleration in Mach2, much better than before. It looks like
>>>>
>>>>
>>>>
>>>>
>>the
>>
>>
>>
>>
>>>>wires are all connected properly but I will recheck everything
>>>>tomorrow. In the old configuration the x axis always ran fine.
>>>>
>>>>If the wiring is fine and the capacitor across the power on the
>>>>Geckos is not bad, what next?
>>>>
>>>>Thanks for any suggestions.
>>>>
>>>>Keith Clark
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>Addresses:
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>>>>
>>>>
>>>>
>>>>
>>wanliker@a..., timg@k...
>>
>>
>>
>>
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>>>>
>>>>
>>>>
>>>>
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>>
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>>
>>
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>>
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>>>>
>>>>http://groups.yahoo.com/group/jobshophomeshop I consider this
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>>>>
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>>>>
>>>--
>>>Ron Kline
>>>
>>>American Precision Ceramics
>>>
>>>
>>>
>>>
>>
>>
>>
>>Addresses:
>>FAQ: http://www.ktmarketing.com/faq.html
>>FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>>Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
>>
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>timg@...
>
>
>>Moderator: pentam@... indigo_red@... davemucha@...
>>
>>
>[Moderators]
>
>
>>URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>>
>>OFF Topic POSTS: General Machining
>>If you wish to post on unlimited OT subjects goto:
>>
>>
>aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if
>you have trouble.
>
>
>>http://www.metalworking.com/news_servers.html
>>
>>http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
>>
>>
>sister site to the CCED group, as many of the same members are there, for OT
>subjects, that are not allowed on the CCED list.
>
>
>>NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
>>
>>
>DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
>
>
>>bill
>>List Mom
>>List Owner
>>
>>
>>Yahoo! Groups Links
>>
>>
>>
>>
>>
>>
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>>
>
>
>

--
Ron Kline

American Precision Ceramics



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