The HP_UHU uses an 8 bit ATMEL processor and discrete transistors. There's an upgraded dsPIC module that plugs in place of it to handle higher res encoders and higher step rates but otherwise works pretty well the same. I have those on the XY axis with 90V DC brushed servos.
The US Digital encoders tended to have noise that resulted in the motors returning to home plus a bit, or minus a bit. The processor reported encoder pulse discrepancies. The dsPIC module handles the encoder in hardware and appears to work better but still had issues with the 10 year old US Digital. Changing to CUI encoders and programming them for the same 250 PPR to match the US Digital has made the two axis very reliable and because they are servos, very quiet. The down side of all this automation is that over the years now I have a spare 2HP single phase motor from the broken compressor. A 1HP single phase (really big) motor from the South Bend Heavy 10L that was replaced with a 3 phase 220 VAC 1HP motor with VFD. And now I have this heavy cast iron 2HP single phase motor that used to sit on top of the mill now sporting a Bergerda 1.8kW AC Servo. The small home made Gingery Lathe has a 1HP sealed motor I bought since the induction fan motors I bought didn't work that well. I have a few of those too. Not sure what to do with them. And there are some DC Treadmill motors that just need encoders. Although the brush configuration is for single direction. Maybe I should build the Gingery Mill and Shaper so I have somewhere to use those motors. John > -----Original Message----- > From: N [mailto:nicklas.karlsso...@gmail.com] > Sent: July-17-20 12:15 AM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Retrofit Candidate? --> Standard components > > Made a few inverter cards myself and chose standard TO220/TO247 instead of > some kind of module. There are thousands to > choose from in different kind of voltages up to 1.2kV and currents up to > around 100A, also different kinds MOSFET/IGBT/SiC/GaN > there choice to some degree depend on voltage. > > > That's a point in favor for discreet components and standard ICs over > > special/custom ICs. Very little worry about having to alter a > design or things becoming unfixable due to a fancy chip being discontinued. > > I forget how many $K I was quoted from a manufacturer to pop out one new > > late 90's vintage 120VDC servo amp, but still > amazing that every component (or close enough) was still available. But it > was less expensive to buy three big steppers more > powerful than the old servos, and the drivers and power supplies for less > than the cost of one vintage servo amp copy. > > > > On Thursday, July 16, 2020, 12:21:52 AM MDT, John Dammeyer > > <jo...@autoartisans.com> wrote: > > > -----Original Message----- > > > From: andrew beck [mailto:andrewbeck0...@gmail.com] > > > Sent: July-15-20 10:03 PM > > > To: Enhanced Machine Controller (EMC) > > > Subject: Re: [Emc-users] Retrofit Candidate? > > > > > > John do you have any details on the new stumble drives? > > > > > As far as I know they are still testing with now discrete transistors > > instead of the driver pack that was discontinued shortly after > they produced it. I have 3 of the STMBL drives and a couple of spare part > drivers. One STMBL on the spindle and I was thinking > replacing the HP_UHUs for the two brushed DC Servos. However, couldn't get > rid of the whine so went back to the HP_UHU. > > > > But then I've also got 2 extra HP_UHU drives that are partially assembled. > > And now a two US Digital encoders that were replaced > with CUI that work better. > > And then there's the extra Shumatech DRO-350 kit still in the box and the > > two DRO-550 of which I only assembled one but > haven't used yet. > > > > Oh and the 400W Bergerda AC servo. Ran the X axis really nice but nowhere > > to mount the drive in the present cabinet. > > > > Oh the list goes on.... > > > > Cheers > > John > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
