CAD CAM EDM DRO - Yahoo Group Archive

Re: L298 goes boom on my camtronics :(

Posted by kooloosj
on 2002-08-07 02:10:28 UTC
Hi all,
Firstly, great list! this is my first message after many months of
silent participation.
I played around with l297 / l298 combination a few years back and
after much smoke and lots of research became very suspicious of the
role the l297 plays in these failures. One of the members here
mentioned main power supply glitches while running were enough to
ping his drives. I can confirm I experienced similar behaviour in a
prototype situation, if the L297 was handling pulse and direction
signals and power removed from it the next power up would smoke the
L298 even with no load attached! I found a number of notes at the
time which mentioned there was an inherent latch-up problem with the
l297 / L298 combination if they were not left in a certain state
prior to power down, which caused problems on next power up. I knew
this didn't make good electrical sense at all, the L297 is simply the
driver but it most certainly did seem to happen.
I then reverted to running my l298's directly from an embedded
microprocessor with L298 signals controlled in software and well, as
long as I disabled all drives to the l298 prior to power down no
problems. But if I did not, next power up, smoke. So maybe it was
really the l298 that had the latch problem?
I never conclusively solved this, but it motivated me to start
building my own discrete drives with a good degree of success.
In concluding I think there are two issues which seem to be
affecting the reliability of this combination, both snubber problems
and some type of latch up issue in the 298. Cause or effect? I still
do not know!
Kind Regards, John Kooloos

Discussion Thread

tauscnc 2002-08-03 21:01:34 UTC L298 goes boom on my camtronics :( afogassa 2002-08-03 21:18:57 UTC Re: L298 goes boom on my camtronics :( RichD 2002-08-03 21:19:09 UTC Re: [CAD_CAM_EDM_DRO] L298 goes boom on my camtronics :( Carol & Jerry Jankura 2002-08-03 22:02:40 UTC RE: [CAD_CAM_EDM_DRO] Re: L298 goes boom on my camtronics :( tauscnc 2002-08-03 22:05:32 UTC Re: L298 goes boom on my camtronics :( RichD 2002-08-03 22:21:32 UTC Re: [CAD_CAM_EDM_DRO] Re: L298 goes boom on my camtronics :( tauscnc 2002-08-03 22:41:37 UTC Re: L298 goes boom on my camtronics :( Randy Gordon-Gilmore 2002-08-03 23:10:38 UTC Re: [CAD_CAM_EDM_DRO] Re: L298 goes boom on my camtronics :( tauscnc 2002-08-03 23:25:40 UTC Re: L298 goes boom on my camtronics :( alenz2002 2002-08-03 23:59:12 UTC Re: L298 goes boom on my camtronics :( bjammin@i... 2002-08-04 05:16:27 UTC Re: [CAD_CAM_EDM_DRO] L298 goes boom on my camtronics :( RichD 2002-08-04 07:57:43 UTC Re: [CAD_CAM_EDM_DRO] L298 goes boom on my camtronics :( tauscnc 2002-08-04 08:08:09 UTC Re: L298 goes boom on my camtronics :( bjammin@i... 2002-08-04 08:39:46 UTC L298 goes boom exeric1 2002-08-04 08:45:23 UTC Re: L298 goes boom on my camtronics :( exeric1 2002-08-04 09:09:31 UTC Re: L298 goes boom tauscnc 2002-08-04 09:53:57 UTC Re: L298 goes boom mayfieldtm 2002-08-04 10:22:36 UTC Re: L298 goes boom RichD 2002-08-04 12:25:20 UTC Re: [CAD_CAM_EDM_DRO] Re: L298 goes boom tauscnc 2002-08-04 12:49:53 UTC Re: L298 goes boom Alan Marconett KM6VV 2002-08-04 14:49:46 UTC Re: L298 goes boom on my camtronics :( Alan Marconett KM6VV 2002-08-04 15:17:14 UTC Re: L298 goes boom on my camtronics :( turbulatordude 2002-08-04 15:20:27 UTC Novice question about - Re: L298 goes boom studleylee 2002-08-04 16:37:48 UTC Re: L298 goes boom Alan Marconett KM6VV 2002-08-04 16:50:24 UTC Re: L298 goes boom studleylee 2002-08-04 17:29:10 UTC Re: L298 goes boom Alan Marconett KM6VV 2002-08-05 10:55:57 UTC Re: L298 goes boom bjammin@i... 2002-08-05 12:39:57 UTC boom mayfieldtm 2002-08-05 12:53:15 UTC Re: boom Bevan Weiss 2002-08-05 18:10:17 UTC re: boom tauscnc 2002-08-05 18:41:05 UTC Re: L298 goes boom - AWO? mayfieldtm 2002-08-05 23:05:54 UTC Re: boom bjammin@i... 2002-08-06 03:57:52 UTC Re: [CAD_CAM_EDM_DRO] re: boom Carol & Jerry Jankura 2002-08-06 05:46:35 UTC RE: [CAD_CAM_EDM_DRO] re: boom mayfieldtm 2002-08-06 08:44:56 UTC Re: boom kooloosj 2002-08-07 02:10:28 UTC Re: L298 goes boom on my camtronics :( Ian W. Wright 2002-08-07 10:25:15 UTC Re: [CAD_CAM_EDM_DRO] Re: L298 goes boom on my camtronics :( tauscnc 2002-08-08 18:48:21 UTC Re: L298 goes boom ( It's Fixed!- Yeah! ) afogassa 2002-08-08 20:51:42 UTC Re: L298 goes boom ( It's Fixed!- Yeah! ) Dave Hylands 2002-08-08 20:57:06 UTC RE: [CAD_CAM_EDM_DRO] Re: L298 goes boom ( It's Fixed!- Yeah! ) tauscnc 2002-08-08 21:06:06 UTC Re: L298 goes boom ( It's Fixed!- Yeah! ) tauscnc 2002-08-08 21:10:41 UTC Re: L298 goes boom ( It's Fixed!- Yeah! ) jeffgnu 2002-08-08 21:42:45 UTC Re: L298 goes boom ( It's Fixed!- Yeah! ) RichD 2002-08-08 21:51:40 UTC Re: [CAD_CAM_EDM_DRO] Re: L298 goes boom ( It's Fixed!- Yeah! ) RichD 2002-08-08 21:55:41 UTC Re: [CAD_CAM_EDM_DRO] Re: L298 goes boom ( It's Fixed!- Yeah! ) jeffgnu 2002-08-08 22:33:46 UTC Re: L298 goes boom ( It's Fixed!- Yeah! ) Ian W. Wright 2002-08-09 00:59:59 UTC Re: [CAD_CAM_EDM_DRO] Re: L298 goes boom ( It's Fixed!- Yeah! ) cadcambee 2002-08-09 01:10:02 UTC Re: L298 goes boom ( It's Fixed!- Yeah! ) caudlet 2002-08-09 08:00:15 UTC Re: L298 goes boom ( It's Fixed!- Yeah! ) cadcambee 2002-08-09 11:51:28 UTC Re: L298 goes boom (AWO) JJ 2002-08-11 11:37:48 UTC RE: [CAD_CAM_EDM_DRO] Re: L298 goes boom ( It's Fixed!- Yeah! )