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Messages - mwchildress

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Technical support / Re:f2424 stepper motor problem
« on: December 19, 2010, 08:46:01 AM »
That may be true however,  This motor was running through a driver UDK2120a at 3800 pps full steps for several weeks.  The driver went bad and we chose to upgrade to the f2424 from the 888 for about the same price as the driver. Now I have a machine down and it only rotates at a fraction of what it was before.Its current RPM at 450 PPS is 135.  This motor was spinnig at 1140 rpm before the change well within what vexta states this motor is capable of.  I need to get this motor spinning to the level it was.  

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Technical support / f2424 stepper motor problem
« on: December 18, 2010, 03:09:18 PM »
I just purchased the F2424 board and we are trying to run a stepper motor (vexta PK268) directly from the board.  At stepspeed 50-450 the motor sounds an rotates smoothly.  Over 450 - 800 pps the motor sounds dirty.  Over 800 pps the motor will no longer rotate. We have tried just about every combination of ramp speed with no change in motor rotation over 800 PPS. We need this motor spinning at 4000 pps .  We have unhooked the motor from the rotary table and hooked the wires directly to the board.  We have verified the correct wiring of the motor several times.   We have moved to a simple program that only moves the motor  and we have installed the diodes as dictated by the manual.  The motor is powered by the same 24 volts as the board.  Any suggestions you might have would be greatly appreciated.
 
 
Michael

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Technical support / Stepper picks it own directtion
« on: November 11, 2009, 06:22:29 PM »
I am using t100md888 to control a stepper drive on an index table.  In my program I need to home the unit first. To do this I tell the drive to make on revolution about 36000 steps to find the home sensor. The problem is the drive seems to choose its own direction to get to home sometimes it rotates clockwise and sometimes counterclockwise.  In simulation mode it always works correctly.  Depending on which direction the motor comes from the point it shuts off at can be 1/8" different.  When I index the drive it always travels the right direction regardless of which direction the drive tried to find home with.

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