On Thursday 15 June 2017 19:33:38 Sebastian Kuzminsky wrote: > On 06/15/2017 05:13 PM, andy pugh wrote: > > A user on the forum is wondering why the base frequency (P04) > > disappeared: > > https://github.com/LinuxCNC/linuxcnc/commit/b392fde59b7b7b781f0f183d > >b165113a054a9a23 > > > > The commit says that it is never used, but he seems to think that it > > needs to be changed when he swaps between spindle motors: > > https://forum.linuxcnc.org/38-general-linuxcnc-questions/32903-huany > >ang-vfd-inverter-modbus-base-frequency#94557 > > > > Was the parameter removed because the VFD does not use it for > > anything? > > I might have goofed there. > > I'm used to setting VFD parameters via the VFD face plate, not via > HAL, but clearly that's not the only way to do it. > > I also found I had to set the max frequency (PD005), but did not have > to set the base frequency (PD004), whatever that is. I noted this in > the manpage. > > If there's a good reason to use the base freq i'm open to reverting > the commit that removes it.
Is the base frequency not supposed to be set at the motors nameplate line frequency, usually 50 or 60 Hz? I think that gives the vfd a basis to calculate the expected current vs frequency on a curve that fairly well approximates a constant torque. OTOH... 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> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
