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Thread: Electrical

  1. #51
    FTC BLOCK PARTY! Game Expert GDC Building Block's Avatar
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    Butt Splice Connectors

    Quote Originally Posted by 2010FTC1000 View Post
    Could a team use butt splice connectors to splice two wires together?
    Yes, butt splice connectors are allowed.

  2. #52
    Game Design Committee Member GDC Snowball Effect's Avatar
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    Quote Originally Posted by 2010FTC3599 View Post
    Our team is using the prototype board with a remote sensor attached to a pivoting arm. To test this arm we used the standard 20 gauge wire and quickly discovered that the wire was broken internally by the flexing of this joint. Would we be allowed to splice stranded heavier gauge (18-16) wire between the 20 gauge used to connect to the prototype board and the wire connecting to the sensor?

    A: Yes, this is allowed.

  3. #53
    FTC BLOCK PARTY! Game Expert GDC Building Block's Avatar
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    Are crimp connect with receptacle and plug allowed?

    Quote Originally Posted by 2010FTC3237 View Post
    Our team is soldering the wires to the motors directly and it's hard to replace bad motors. We're thinking about using plugs like the ones on the 12v battery to the switch to make the process easier. Are crimp connect with receptacle and plug allowed? Here's an example picture: http://cdn.sigma.octopart.com/953432...03-12-1036.jpg

    Thanks!
    The part referenced in the post is not permitted. See post #21 in this forum thread (Robot Electrical) for a similar part that is permitted.

  4. #54
    FTC BLOCK PARTY! Game Expert GDC Building Block's Avatar
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    "Y" cables for power distribution

    Quote Originally Posted by 2010FTC2843 View Post
    In post #36 you allowed splices to make "Y" cables for motors. Are we allowed to create "Y" cables for power distribution to the motor/servo controllers either by soldering or the allowed insulated snap plug connectors (post #21)? This would be similar to the suggested power wiring for the Samantha Unit.

    Thanks,

    Yes, this is permitted.

  5. #55
    FTC BLOCK PARTY! Game Expert GDC Building Block's Avatar
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    Tamiya Connectors

    Quote Originally Posted by 2010FTC3237 View Post
    Are we allowed to use Tamiya connectors on our robot?
    The Tamiya connectors that are used with the TETRIX battery pack are the only allowed Tamiya connectors on the robot. Additional Tamiya connectors are not permitted.

  6. #56
    FTC BLOCK PARTY! Game Expert GDC Building Block's Avatar
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    TETRIX Fuse-Protected Motor Power Cable

    Quote Originally Posted by 2010FTC3785 View Post
    We are using fused wiring for our motors and every once in a while- gremlin like- the motors go on the fritz and it seems that the in line fuse is clicking on and off which makes the robot go crazy- so to speak. Do the fused wires have a limited life? We have 2 robots and -1 robot has 6 motors and has more wiring issues but our other robot is prone to these intermitant electrical problems? Any suggestions?
    The manufacturer does not specify a “lifespan” of the part, nor do they provide an expected number of cycles that the part can reliably be operated.

    The way this part works is that once it goes into a “trip” condition, a self heating property keeps the part open circuit until all current has been removed. In our case, that means bringing the power to the DC motor to zero (0). Once this happens, the part will cool down to the reset condition.

    If a motor is very quickly being brought back to stall level, or continuously operated close to the trip point max, there could be a “chattering” affect because the thermal device is being operated “hot”. So, in the case described in the post, it sounds like it is doing it’s job of protecting the motor.

    In general, if a motor is experiencing this chattering, we suggest allowing time after a trip condition for the thermal stall sensor to cool down before re-applying heavy load conditions to the affected motor. Or, use the stall sensor power cables just for testing and prototyping of the robot during initial design and build. Once the design and software has been worked out, switch to the standard power cables.

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