Greetings Peter; The new vfd materialized here today, and I see it actually has what it calls an RS485 interface, a teeny little white 3 pin socket on its motherboard.
And I have one or two 422 to 485 translators, the $2 variety, that I believe are duplex capable as I had to wire them to a solid logic level on the 5i25 end of them before they would take the balanced signals from the encoder I put on the spindle motor of my G0704, and make nice 5 volt rail to rail square waves to feed the 5i25. If I jury rig the separate 422 lines end of that to the 422 terminals on that 7i76D, can I talk to a huan yueng lookalike? That is what I supposedly bought but the instruction booklet makes no brand claims. It is a YL-620-A, and it also has the usual analog interface too. It claims no ascii, but supports the modbus RTU protocol, and mentions modbus several times.. Am I better off useing the analog, or is the RS-485 the better control? I also see an AO output, but its reads like 0-5 volts, which doesn't sound like it would work to indicate the achieved speed via one of the A/D's on the 7i76D when the 7i76 goes to about 38 volts full scale. This is the first vfd I've had that actually has braking R terminals, and says optional, but if used s/b 100 ohms, 100 watt. What advantage would hooking one of those up amount to? Thanks for any advice Peter. 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> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
