On 22 April 2010 04:16, Jon Elson <[email protected]> wrote: > I have 8 "gears", really 4 belt positions and direct-drive or > back-gear. I've been thinking of putting a microswitch on the backgear > handle and some long-distance photo detectors to sense the belt > position. Then this would feed into a HAL mux to select the right > calibration factor for the spindle VFD.
There you are then, running the spindle closed-loop as you can now that you have an encoder makes that unnecessary. Or you could do some clever HAL-maths with window comparators to compare actual speed with VFD drive PWM to infer the current gear. FWIW that is how the manual-box cars that I work on detect which gear they are in, there is no actual gearbox sensor, just road speed and engine speed. All sorts of things are gear-dependent from idle-governor PID parameters to gearbox-protection torque-limits) Thing is, once you are doing that HAL-fiddling you might as well just be running closed loop on the spindle speed which also automatically increases the slip speed as the load increases. -- atp ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
