On Thursday 11 April 2019 18:30:12 Peter C. Wallace wrote: > On Thu, 11 Apr 2019, Gene Heskett wrote: > > Date: Thu, 11 Apr 2019 17:56:45 -0400 > > From: Gene Heskett <[email protected]> > > Reply-To: "Enhanced Machine Controller (EMC)" > > <[email protected]> > > To: "Enhanced Machine Controller (EMC)" > > <[email protected]> Subject: [Emc-users] For PCW > > > > 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? > > Unfortunately you cannot do this currently since MODBUS is not > supported by the Hostmot2 UART driver. > That settles that then, thank you Peter. > > Analog control may be better for things like rigid tapping since the > normal MODBUS driver is a userland task (and I'm not sure how real > time the MODBUS implementation in the VFD is.
Rigid tapping takes 2 things, an encoder, and 40x the torque. > > 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. > > If you have a spindle encoder, that a better way to get speed feedback That would take something there's no room for. ER20 collet. What little room may get used by a hack-a-day pattern of tool changer because it will need a solenoid driven wrench to lock the spindle. > > 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? > > Faster slow-down and faster reversals if tapping. which I won't be doing. > > Thanks for any advice Peter. Thank you 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
