Re: [Emc-users] 7i76 and spindle control
On 26 September 2014 04:28, Peter C. Wallace p...@mesanet.com wrote: 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 It might be important to stress isolated there. The KBIC controller float the pot at +100 volts or so. One solution is probably a small 12V - 12V isolated DC-DC converter connected to the normal 12V DC. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- 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=154622311iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] 7i76 and spindle control
On Friday 26 September 2014 05:58:37 andy pugh did opine And Gene did reply: On 26 September 2014 04:28, Peter C. Wallace p...@mesanet.com wrote: 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 It might be important to stress isolated there. The KBIC controller float the pot at +100 volts or so. I'll add even more emphasis to this warning. We tend to forget that which Just Works(TM) One solution is probably a small 12V - 12V isolated DC-DC converter connected to the normal 12V DC. That is another avenue, and a actually a good suggestion as those are generally less costly than a line transformer powered solution and considerably smaller physically. Since this circuit generally needs less than 20 milliamps, if no 12 volts is available but 5 volts is, there are 5 to 12 converters available too. But they MUST BE TRANSFORMER ISOLATED, the charge pump designs have way too much leakage coupling due to the use of capacitance for the power transfer method. Leakage that can destroy circuitry if accidentally grounded, and kill you if you are the grounding medium. :( Good advice Andy, thanks. 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 US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS -- 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=154622311iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] 7i76 and spindle control
Andy, Gene - I do have a spare 12v linear regulated supply and a nice small 5v switching sitting by my new mill, was going to prototype with the 5v first. (KBIC says 0-7v input in voltage follower mode - 0-5v will get me going) Interesting about the dc-dc converters; on reading, as Gene says, some are isolated, some are not. The local store does have lots of switching power supplies of varying voltages, and I do have a large metal box for all of this to go into, but I dislike clutter. So, I'll see if the local store has a 12v 12v dc isolated converter that is small and compact. I appreciate the isolation warnings; while I do realize that I'm playing with 110v, 15A here, but it is nice to have the reminder, and also, for others who may stumble across this thread. Thank you! JohnS -- 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=154622311iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] 7i76 and spindle control
On Friday 26 September 2014 10:24:09 John Alexander Stewart did opine And Gene did reply: Andy, Gene - I do have a spare 12v linear regulated supply and a nice small 5v switching sitting by my new mill, was going to prototype with the 5v first. (KBIC says 0-7v input in voltage follower mode - 0-5v will get me going) Interesting about the dc-dc converters; on reading, as Gene says, some are isolated, some are not. The local store does have lots of switching power supplies of varying voltages, and I do have a large metal box for all of this to go into, but I dislike clutter. That is why you put the clutter in a swarf proof box. ;-) And while I am at it, some of our servo controllers will, when slowing to stop or reverse, dump the motors energy back into the the psu, raising its output voltage significantly. Very few switchers are capable of dealing with that and will go into over voltage protection shutdowns. So anytime I'm not pure steppers, I use a simple transformer and cap supply, it doesn't bither them a bot. :) The fact that it needs a 2 wheel hand cart to move it any great distance is beside the point. What I finally wound up with here, to run a 1 HP rated escapee from a treadmill, has a 2500va transformer and a need for a strong back to move it. Parts cabbaged from an old Phase Linear dual 750 rms watts a channel amplifier, and caps from an IBM printer that was about the same size as a 17 cu ft chest freezer when it was alive. The Phase Linears caps were only surge rated to about 125 volts. But I have 150 volts for a surge margin using 2 of the IBM caps with a 5k equalizer bleeder across each, wired in series. I think I can weld stuff with it. Evidence of that is a nice steel cookie socket in the side of a wrench that shorted them a day after it had been turned off before I added a 7 watt xmas tree lamp to the output for a bleedoff. Takes several minutes at that, big caps, 3 in diameter 7.5 tall. 19,000 uf IIRC. So, I'll see if the local store has a 12v 12v dc isolated converter that is small and compact. I appreciate the isolation warnings; while I do realize that I'm playing with 110v, 15A here, but it is nice to have the reminder, and also, for others who may stumble across this thread. Thank you! JohnS NP John 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 US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS -- 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=154622311iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[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. -- 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=154622311iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] 7i76 and spindle control
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=154622311iu=/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=154622311iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] 7i76 and spindle control
Hi Peter; Thanks for the response - I'll try that tomorrow. My first mill (different manufacturer) was an easy replacement - no external power required - so my mind was set in just do it the same mode. So far, Chris Morley's pncconf is working well with your products - having fun with this build. John A. Stewart. -- 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=154622311iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
