On 20 Jan 2008 at 0:43, [EMAIL PROTECTED] wrote: On my BP I use a phase converter for the spindle. To provide an inerlock I use a potential relay to drop out the servos if I loose voltage at the spindle.
John > Like taking a cut that is heavy enough that the VFD trips on overload, > and the machine keeps driving the no-longer-spinning cutter through > the workpiece. SNAP! > > My Van Norman mill had the feedmotor interlocked to the spindle motor > to avoid exactly that issue (designed in about 1939). When I replaced > the motor starters with VFDs I did the same, and I'm glad I did. That > little machine is very rigid - enough so that it can take a 1-1/2HP > cut that will trip the spindle drive with no audible sign of > struggling. ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
