On Friday 25 May 2018 01:04:36 jeremy youngs wrote: > On Thu, May 24, 2018, 23:45 Gene Heskett <[email protected]> wrote: > > On Thursday 24 May 2018 21:58:31 jeremy youngs wrote: > > > Sorry, autocorrect, > > > > > > Heds 8950 encoder > > > > Its not an Omron then? I have used one before, in a project for the > > tv station, never gave a hint of trouble. But I know nothing about a > > HED 8950. I'll see if I can find something about it on the web. > > > > Looks like it may be an obsoleted model. Or, less of a chance, too > > new for their catalog. It is not listed on the makers site. So my > > best idea is to get an Omron from Ebay. A dollar or so more than a > > $20 bill, maybe $25 with shipping from someplace in the USA. > > Obsolete for sure, these are ametek tape drive motors , had a friend > in Syracuse that had a 40000 square foot electronics recycling center > I got these from . Probably twenty to thirty years old. I'm searching > for a 5/8 hole replacement now, I found some cui at mouser but we have > had weather and my internet here in the Ozarks is almost non existent. > > > > > The 7i42TA's are that. Limiting the current to a value below > > > > the failure of the gates in the fpga on the 7i90HD. IF you are > > > > feeding them 5 volts. > > > > > > > > What diode are you referring to? > > > > > > The led that drives the optical encoder. It does not pass a diode > > > check and > > > > > > > I am no longer able to see voltage changes on the a and b > > > > encoder wires. So I figure I over currented the led . > > > > Thats what warranties are for. If you only fed it 5 volts on the red > > wire, and it has now failed, its duff, send it back. > > I'm sure there is no warranty on these freebies. > > > OTOH, if its NOS and died, its a good chance the next one will be > > the same age and well up the far end of the famous bathtub curve. > > I'd vote with my card, and get the Omron. > > > > Mounting is my biggest issue with this, and if I do I may as well > > get six as that's eventually what will be needed. The good news is > > my shop is about to be overloaded with Broken cars and we'll off > > customers, the bad , once it starts next week I won't look up for a > > month, then some concrete to pour and machine parts to buy, yep time > > and money, the two are mutually exclusive to the working stiff. > > > > Oh, and if somebody is taking up a collection to round up this > > Murphy guy... It sucks just when progress was being made. > > Was able to verify pwm output with my radio shack multi meter with > frequency counter, so while Murphy has stopped one thing , now it is > to build an isolation supply and put these 28 volt 28 amp DC DC > converters together and make the generic h bridge run these motors, > and outfit all of the control works to an atx case I have laying > around and gut the nema case that formerly housed stepper drives and > control system. > > How long is tool long for this 50 pin cables? I understand the > shortest the better but 2 foot would be great or would it be better to > extend the db25 cable? Probably that one as it's only one cable. > I have 2 db25's on the g0704, so I can say that 4 feet doesn't seem to be a problem. On the sheldon, the 50 pin cabless are about 4" long, with the 7i42TA's mounted on top of the 7i90 and the spi adapter and buss to the 7i90 is about an inch long. That bus runs at a 42 megabaud write, and a 25 megabaud read, so long cables aren't something I allowed to happen. But the short cable demanded the pi be heat sinked, with an old video card fan under it blowing up into the heat sinks. Zero stability problems. With no ups, uptime is usually from power failure to power failure, 65 days once.
> > Take care, Jeremy. > > Always, and you too Gene. -- Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
