On Thu, 25 Sep 2014, John Alexander Stewart wrote: > Date: Thu, 25 Sep 2014 20:56:33 -0400 > From: John Alexander Stewart <ivatt...@gmail.com> > Reply-To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Subject: [Emc-users] 7i76 and spindle control > > I have a G0704 mill (known "up here" as a King Canada KC20-VS) that is > being CNC'd, with only one real issue cropping up. > > The spindle speed control - original is a 4.7k pot, the spindle circuit > board is a "copy" of a KBIC 120 style board. > > With the 4.7K pot in place, I measure 4.14v across the outer leads. With it > removed, the circuit board shows about 11.9v. When I connect up to the > 7i76, the voltage drops to 1.89v. No matter what I do (not that I'm an > expert in this config) I can't get anything other than 0.0v out of the 7i76 > spindle out. > > Does the 7i76 draw more current (twice as much, approx) as a 4.7k > potentiometer? > > If so, I might have an "out": > > The KBIC board allows for "voltage following" with an external 0-7v supply > leading to one of the leads for the potentiometer, and one of the field > wiring connections; maybe this board will act the same. > > Anyone know if what the 7i76 is doing is correct? > > Thanks - JohnS.
The 7I76 spindle analog out circuitry expects a regulated 5V to 12V supply, your supply has about 10K Ohms of series resistance so is not a suitable voltage source. You can use an isolated external supply of 5 to 12V > ------------------------------------------------------------------------------ > Meet PCI DSS 3.0 Compliance Requirements with EventLog Analyzer > Achieve PCI DSS 3.0 Compliant Status with Out-of-the-box PCI DSS Reports > Are you Audit-Ready for PCI DSS 3.0 Compliance? Download White paper > Comply to PCI DSS 3.0 Requirement 10 and 11.5 with EventLog Analyzer > http://pubads.g.doubleclick.net/gampad/clk?id=154622311&iu=/4140/ostg.clktrk > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > Peter Wallace Mesa Electronics (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination. ------------------------------------------------------------------------------ Meet PCI DSS 3.0 Compliance Requirements with EventLog Analyzer Achieve PCI DSS 3.0 Compliant Status with Out-of-the-box PCI DSS Reports Are you Audit-Ready for PCI DSS 3.0 Compliance? Download White paper Comply to PCI DSS 3.0 Requirement 10 and 11.5 with EventLog Analyzer http://pubads.g.doubleclick.net/gampad/clk?id=154622311&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users