On Sunday 13 March 2016 09:30:30 John Thornton wrote: > I just used the the one for by the drive. I "think" not all drives > would use the same resistor. Just looking at the GS2 and there are 12 > different braking resistors. > All of which are $435 a copy & still need some sort of an extra, external controller. AD thinks we are growing our own money on a tree in the back yard?
I'll look at the controller I have first. I should be able to do it for under a $100 Ben Franklin picture. > http://www.automationdirect.com/adc/Shopping/Catalog/Drives/GS2_%28115 >_-z-_230_-z-_460_-z-_575_VAC_V-z-Hz_Control%29/GS2_Drive_Units_%28115_- >z-_230_-z-_460_-z-_575_VAC%29/GS2-23P0 > > http://www.automationdirect.com/adc/Shopping/Catalog/Drives/AC_Drive_( >VFD)_Spare_Parts_-a-_Accessories/GS_Braking_Options_(Braking_Units_-a-_ >Resistors)/Braking_Options_(All_GS_Drives)/GS-23P0-BR > > JT > > On 3/13/2016 8:03 AM, Gene Heskett wrote: > > On Sunday 13 March 2016 07:40:25 John Thornton wrote: > >> On my GS-2 with the braking resistor I go from 1800 fwd to 1800 rev > >> in 1 second. I have both acceleration and deceleration set to 1/2 > >> second. > >> > >> JT > > > > That would be considerably more usefull than the controllers default > > of 30 seconds. Do you recall the specs of the resistor you used? > > > > Thanks John. > > > >> On 3/12/2016 10:12 PM, Gene Heskett wrote: > >>> Greetings everybody; > >>> > >>> Given that I note the vfd's seem to have an adjustable > >>> accelleration control, and that my couple of hours playing with it > >>> from its own front panel, I am led at ask the question of just how > >>> fast can one of these things be reversed from say 1000 rpm at the > >>> motor spindle? > >>> > >>> I ask because my present setup, using the OEM PM DC motor which is > >>> all gear drive to the spindle, one of Jons pwm servo amplifiers > >>> and a 125 volt dc supply, reversals at the turn around depth of > >>> this cycle of a peck tapping operation, with the spindle doing 300 > >>> rpms, is a very small fraction of a second, far less than 30 > >>> degrees of rotation. Based on its reversal performance at 2500 > >>> rpms being a slim second, I am concerned that the vfd may not be > >>> able to reverse so quickly, and will impact my use of G33.1 > >>> because of the turnaround over shoots. On my lathe, with its > >>> fragile drive train and a 5" chuck, this overshoot is between 2 > >>> and 3 turns at 250 running rpms. Usable, but if I don't stop it > >>> soon enough, the tap may bottom out and break. > >>> > >>> What has been the experience of others using smaller vfd's and > >>> motors? > >>> > >>> Can you still do rigid tapping safely? > >>> > >>> Thanks all. > >>> > >>> Cheers, Gene Heskett > >> > >> ------------------------------------------------------------------- > >>--- -------- Transform Data into Opportunity. > >> Accelerate data analysis in your applications with > >> Intel Data Analytics Acceleration Library. > >> Click to learn more. > >> http://pubads.g.doubleclick.net/gampad/clk?id=278785111&iu=/4140 > >> _______________________________________________ > >> Emc-users mailing list > >> Emc-users@lists.sourceforge.net > >> https://lists.sourceforge.net/lists/listinfo/emc-users > > > > Cheers, Gene Heskett > > ---------------------------------------------------------------------- >-------- Transform Data into Opportunity. > Accelerate data analysis in your applications with > Intel Data Analytics Acceleration Library. > Click to learn more. > http://pubads.g.doubleclick.net/gampad/clk?id=278785111&iu=/4140 > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users 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> ------------------------------------------------------------------------------ Transform Data into Opportunity. Accelerate data analysis in your applications with Intel Data Analytics Acceleration Library. Click to learn more. http://pubads.g.doubleclick.net/gampad/clk?id=278785111&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
