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AMT103 encoder ground *WARNING*
The AMT103 encoder from CUI has a metal body. It is electrically connected to the ground pin on the connector. If the encoder is physically in contact with metal mounting hardware that connects to the robot frame, then there is continuity from the frame through the encoder to the negative terminal of the battery. If battery voltage is accidentally applied to the frame, something is probably going to burn.
In our case, that "something" was the ground wire in the ribbon cable between a Talon SRX and an encoder breakout board.
We have metal 10-32 bolts holding the am-0208 encoder mounts to the gearbox. We are currently in the process of replacing them with nylon bolts.
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If it is good enough for Paul and JVN it's good enough for me. - Vikesrock [more] 
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