No experience with your cheap Chinese VFDs but all the VFDs I've worked with used 12v (or higher) for the logic.
----- Original Message ----- From: "Gene Heskett" <[email protected]> To: "Enhanced Machine Controller (EMC)" <[email protected]> Sent: Friday, October 21, 2016 6:27:33 PM Subject: [Emc-users] One of those $16 dollar questions... Greetings all; Hooking up this phony vfd, I had run into a problem. Has anyone else come to the conclusion that these things need a 12 volt logic level? Currently I am feeding it a 10 kilohertz pwm, a rail to rail signal at about 4.95 volts swing, for the speed signal, and that works, running it from the minimum of 19.75 hz at the low end, and 120 hz at the high end. But a 5 volt drive on either the fwd or the rev terminals is always fwd. No reverse. The hookup diagram, such as it is, shows a row of external pushbuttons that only the fwd and d2/jog lines are fed 12 volts, so I am thinking that while they do not show a connection to the other 4 pushbuttons. If thats the case, I should see 12 volts on all those terminals as a ground connection is the active state of the switches. And I hope I haven't blown the bob. Sigh.. I've one spare conductor in the control cable, and a 4 channel opto-isolater that I can make look like the pushbuttons, so I am wondering if others have had to resort to high voltage logic to run one of these things? I'll find out I guess, I'm just in to sit and rest my back and talk to anyone that will listen. Thanks for reading, I'll report later so its part of the archive. 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 ------------------------------------------------------------------------------ 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
