On Tuesday 05 August 2014 19:56:05 andy pugh did opine And Gene did reply: > On 6 August 2014 00:47, Gene Heskett <[email protected]> wrote: > >> Three-phase PWM. > > > > Something I am not familiar with. 3 phase power, yes, but not pwm. > > There is a three-phase PWM generator in your VFD.
I do not have a VFD. The mill still has the OEM controller (repaired once by moi) and motor, controlled by a PMDX-106. Uses dynamic brakes to stop the quill in quite short order as there are not any great shakes for flywheels in the mill. The lathe has a 1hp treadmill motor and a single quadrant 0-10 volt drive, 10 CCW, 25 surge amps, controller made by a small outfit in WIS IIRC. I synthesize the reverse quadrant and dynamic braking with hal modules and relays for the power routing. Makes it look like a slow VFD I guess since that motor has a huge flywheel/fan, but didn't cost me $400 either. :) It does a G33.1 (rigid tapping) fairly well though. > It drives the 6 > individual gates that make up the three-phase bridge. > The Mesa 3pwm has 6 (or three) phase-locked PWM channels with a > settable dead-time to ensure no shoot-through. 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 ------------------------------------------------------------------------------ Infragistics Professional Build stunning WinForms apps today! Reboot your WinForms applications with our WinForms controls. Build a bridge from your legacy apps to the future. http://pubads.g.doubleclick.net/gampad/clk?id=153845071&iu=/4140/ostg.clktrk _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
