Thread: BACKDRIVE PLEASE HELP!!!!!
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Unread 23-06-2002, 21:58
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#0047 (ChiefDelphi)
  
Join Date: May 2001
Location: Pontiac, MI
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One man's experience
Posted by Joe Johnson.   [PICTURE: SAME | NEW | HELP]


Engineer on team #47, Chief Delphi, from Pontiac Central High School and Delphi Automotive Systems.

Posted on 2/23/2000 3:30 PM MST


In Reply to: Re: Dynamic Braking has limits... posted by Thomas A. Frank on 2/23/2000 3:02 PM MST:



Tom,

I could be mistaken, but I think you are not wholly correct regarding when the Victors dynamically brake their outputs.

If you UNPLUG the robot from power, then there is no dynamic breaking, but if the Victor looses signal and it has the jumper in the dynamic braking mode (pins C & B shorted), then the internal CPU on the Victor continues to short the motor leads to each other (a.k.a. dynamically brake the motor). When power is lost to the Victor, then the CPU can no longer do the job of turning on the correct FET's which short the leads, so dynamic braking is not possible.

I have not actually read the manual on this one, but I know from much experience that the battery must be unplugged to turn off the dynamic braking. It is not enough to just disable the Basic Stamp 2 CPU, or even to unplug the PWM signal wire.

Can anyone dramatically break the tie on this dynamic braking issue?

If so, please do.

Joe J.


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