I know a number of people are using my PWM servo amps with Mesa controller boards. A feature of the dumb control logic on the servo amp is that it needs a short pulse in each direction to clear the shutdown latches on the FET driver chips. I built a little state machine into the driver to accomplish this, it is called the "bootstrap" parameter. It gives 5% duty cycle pulses in each direction on consecutive servo cycles, then goes to normal operation as commanded by the PWM input. If you don't do this, the drive can act like it is disabled until you attempt to move it both directions, then it will suddenly come "live".
So, has anyone written up a couple lines of HAL to do this, or how else do you solve the problem? (This applies only to the brush version of the servo amp, the brushless amp has a CPLD that manages this function.) Thanks, Jon ------------------------------------------------------------------------------ The Palm PDK Hot Apps Program offers developers who use the Plug-In Development Kit to bring their C/C++ apps to Palm for a share of $1 Million in cash or HP Products. Visit us here for more details: http://p.sf.net/sfu/dev2dev-palm _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
