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

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
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
>>>
>>>
>>>
>>>
>>>
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>>--
>>Ron Kline
>>
>>American Precision Ceramics
>>
>>
>
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>
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[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........

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--
Ron Kline

American Precision Ceramics



[Non-text portions of this message have been removed]



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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.
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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........
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