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-   -   Exploding 884s (http://www.chiefdelphi.com/forums/showthread.php?t=18398)

Al Skierkiewicz 02-03-2003 13:32

You are making some grave assumptions here. The design free speed and the loaded speed (in actual production models) are two different things, not to mention the distinct difference in speed between motor forward and reverse. Added to the fact that the spacing of the commutator and the switching frequency of the speed controllers affect the average power delivered to the motor, etc., etc. When you calibrate a speed controller, you are merely telling it that the maximum value and the minimum value you have sent it are to be interpreted as 255 and 0 respectively and that the position of the joystick at the moment you release the calibrate button is 127. I can see that calibrating both at the same time might be thought of as an ideal situation, I just think it sounds dangerous from a safety and operation standpoint. If you do not test the motors (and calibrate them) independently, how do you know that either of them is functioning properly?

Bduggan04 02-03-2003 15:00

Quote:

Originally posted by Simeon
our victors haven't exploded, but one of our spikes did
something smelled funny
then after like 1/2 an hour we found that the little resistor thing on the side had totally melted...
the fuse was perfectly fine tho.
:confused:

You probably reversed the polarity to the spike. I believe that the "little resistor thing" is actually a diode meant to allow the current to travel one way only. It melting would make sense if you reversed the polarity.


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