Yes, the DCM terminal is the digital common for FWD and REV. That works fine on my system (that I'm working on as I write). What did not work for me was the UPF and DRV outputs that also use the DCM common. Those are supposed to be open collector outputs that can be used for spindle-at-speed, spindle- stopped, or running indications. Neither output works on my system at all. I gave up and did a sets spindle-at-speed 1.
-- Ralph ________________________________________ From: Gene Heskett [ghesk...@shentel.net] Sent: Tuesday, December 22, 2020 3:23 PM To: Enhanced Machine Controller (EMC) Subject: [Emc-users] Checking vfd hookup question? CAUTION: This email originated from outside the Walla Walla University email system. Greetings all; Swapping a 110 volt vfd, for a 250 volt vfd, one of the terminals is labeled differently, the common point of the fwd/rev/spd1-2-3-4-5 terminals on the 110 volter is labeled XGND But the common point terminal on the higher voltage unit is labeled DCM but the diagram of how to hook up external controls is identical. Is there any good reason to treat it differently in hooking it to a 7i76D? It should all be equ as its the presence of continuity from the fwd/rev terminals to this XDNG/DCM common point that determines the command. There is no terminal labeled neutral on this controller, only a marked static ground which I ran back to the services static bar, not to the neutral bar. But my copy of the NEC is now 24 years old, so I'm asking, hopefully, someone with a more recent copy. This is also the first vfd I've had that actually has hookups for a dump resistor. 2.2 kw vfd & motor, running on 250 volt single phase, what is good value and wattage for this resistor? Thanks folks. 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) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <https://nam12.safelinks.protection.outlook.com/?url=http%3A%2F%2Fgeneslinuxbox.net%3A6309%2Fgene&data=04%7C01%7Cralph.stirling%40wallawalla.edu%7C54f6924228d0410e642f08d8a6d09edb%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637442762249729745%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=04nRbfqvir2AIh7e15HIRDgKdY1OLfCMxVVUOWkwtGU%3D&reserved=0> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=04%7C01%7Cralph.stirling%40wallawalla.edu%7C54f6924228d0410e642f08d8a6d09edb%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637442762249729745%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=7XL53bo0SdWDR88cjShS%2FqaRjr4DX9P73Qu5HY1rqzM%3D&reserved=0 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
