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This is a problem with the High gear on the drill motors. The same thing happens to us, but not in low gear.
Try setting your drill motor tranny to the low gear setting. Im not sure if its up or down, but there is a ring which slides on the drill motor transmission. Try adjusting that (not while moving!!!) it either has to be all the way up, or all the way down. if its in the middle, the motor will just spin.
When the motor is in high gear, it probably doesnt have enough torque to get the whole bot moving, so it is running at stall current (it draws the most current). This makes the breakers trip, and eventually, if you keep trying to move the motors, they will burn out.
You can verify this by listening for a clicking noise when this happens. That is the auto-resetting breakers tripping, then resetting.
The 40a breakers will help a bit, but im not sure because we havent gotten ours yet. Try some cooling spray if you really want to get that 29 ft/sec from the high gear setting! (but be carefull, the drill motors get REALLY hot, you may get a nasty burn)
TenkaI
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