Re: [CAD_CAM_EDM_DRO] Re: loking for help with power supply for rutex drives...

HI Dave - List;

Proper filtering on your AC lines is a worthwhile endeavor as a number
of problems can be eliminated. Motor drives can generate much in the
way of interference with other hardware, interference which is often
dififcult to track down. In some situations, on commercial work, I've
had to resort to tracking filters and other techniques. So I wouldn't
look at AC filters as a blet and braces approach, it is more of a sound
engineering approach. Just as snubbing diodes across DC relays should
always be considered the norm. along with RC networks for AC relays.

Little inexpensive details like these, implemented up front, can
elimiante alot of debugging down the road.

Dave


Dave Fisher wrote:

>----- Original Message -----
>From: "ckhaun2000" <ckhaun@...>
>To: <CAD_CAM_EDM_DRO@yahoogroups.com>
>Sent: Thursday, December 11, 2003 10:43 PM
>Subject: [CAD_CAM_EDM_DRO] Re: loking for help with power supply for rutex drives...
>
>
>
>
>>>Couple of other comments, you may want to include a mains filter on
>>>
>>>
>>the input side of the transformer - this would protect against any short
>>spikes etc on the mains.
>>
>>
>>>Use good quality caps with a high ripple current ripple rateing
>>>
>>>You may get away with a single mains transformer to drive all 3
>>>
>>>
>>amps - as long as you
>>
>>
>>>allow for a good current rateing, which should probably be rated at
>>>
>>>
>>20 Amps.
>>
>>
>>>Good luck
>>>
>>>Dave Fisher
>>>
>>>
>>>
>>>
>>I am also a newbie here (long time lurker). My question is about the
>>mains filter mentioned above. Are we talking a capacitor, or is it an
>>actual item that can be bought. How would I determine the size I
>>needed? Any other info about this would be great. I thought I was all
>>ready to start building my supply. DOH! I am also retrofitting a
>>Bridgeport clone (Tree).
>>
>>
>
>The mains filter type I refer to can be bought as a sealed unit - normally
>contains an RC network internally with ferrite cores etc, They are normally
>between $10 to $25. They are nearly always rated at line voltage and get
>larger depending on the amps (load) they can carrry. I suggested the use
>to the previous poster as a belt and braces method, bit out of habit !!
>
>They would not be a major benefit on a power supply that was JUST powering
>servo motors - but would be more beneficial to 'clean up' AC line supplies that
>end up powering DC supplies that power any kind of logic / computer circuitry.
>In fact with our Rutex amps we use a totaly seperate PSU to operate the logic.
>
>For the record, this type of low cost filter will not protect against ' Brown Outs'
>or varying line voltages or high voltage transients.
>
>Rgds
>
>Dave Fisher
>
>
>
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>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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