Re: [CAD_CAM_EDM_DRO] Weird VFD behavior - the THUNK?

My transformer for my control was doing that one day and it turned out to be line spikes from the utility company. It had to have been because it hasnt done it since. It fried the the big cap in one of the Geckos which I replaced for $2 and it works fine again. The machine was at idle when it happened. Same as your saying, about every 15 minutes or so..boomp! I didnt have the 100v 1000uf caps at each drive to protect. I do now.

Ron

washcomp <jeff@...> wrote:


I've just finished wiring up a 3HP variable frequency drive
(Omron/Yaskawa G5+) to my 1.5 HP Bridgeport. Feed to VFD is 3 phase.

I go from the line to a Corcom line filter to a line reactor to a
wrap around a ferrite core (one wrap) to the VFD to a load reactor to
the BP. There is a braking resistor (ferrite core on brake wires).

Motor is not running in this case (no load condition)

Problem:

Every 15 minutes or so, a sound like a gunshot comes out of the
setup. No smoke, no sparks, LED's on VFD do not even blink - seems
like no harm is being done. This sounds like hitting a garbage can
cover with a baseball bat (or like a VERY large contactor thunking
in).

Since it happens so intermittantly, I haven't been able to pin down
what item is making the noise, but it's scary as hell.

Maybe the line ferrite core should come before the reactor? Could it
be that it's becoming magnitized and thumping against the metal
housing? I'm really confused ;-o

Anyone have a clue?

Jeff







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

Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@..., 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









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