3 CIM Drive Train Battery Draw

[JamesCH95]

Originally Posted by kevin.li.rit

Hmmm, wasn't the breaker that year at 80A? I suspect the RC or radio was losing power as the battery was drawn down. No dedicated supply for the radio or backup battery for the RC to prevent it from resetting.

It was a 60A main breaker. Like the current 120A main breaker it was tolerant of large over-currents for prolonged periods of time. I don't recall that robot ever blowing a main breaker.

Don't get me wrong, resetting also happened (at around 6V IIRC). More than once. The next year we got back-up batteries... and not long after that we got 120A main breakers too.

As a student on the pit crew for that robot I distinctly recall checking battery voltages after matches (where the robot was driven a lot) and reading 9-10V floating on the battery.

The big SNAFU with that robot is that we used worm gears to get lots of gear reduction in the small space on our swerve modules, and if anything was a tiny bit out of alignment the drag from those gear-sets could cause ~40-60A no-load draw, and it could be more if the steering motors were active.