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.
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
