Personally I would like to come up with a simple test cycle to verify that the machine has been manually set in the correct gear without any switches. Having a Bridgeport type machine I can adjust speed manually assuming the machine is in the right High/Low range.
Simply command the VFD to start and run for 3-5 seconds at the minimum functional no load speed say 3-10Hz and read in the tach ( index ) signal and with a lookup table identify the current gear. If the gear verifies the M3/M4 then accelerates the spindle to the S#### value. This would error if machine is out of range 60-500 for low, 500-4000rpm in high. It could also be used if spindle is in correct gear range for me to adjust the RPM and hold motion until the tach reads Spindle-At-Speed. Look up table works well for geared lathes and step puley type machines as well. While the paranoid engineer in me says hard wired fall backs are always the best choice I also know that as people reach a point in the build they want to use the machine for real work - often before all limits and other wiring is complete. I admit I am in this group as I will need to use my mill to complete part of the final control chassis. As is it is mounted via wood supports and is free standing. Greg ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
