pic: Did Somebody Say Defense Game?

[magnets]

Originally Posted by wilsonmw04

yep, still broken for me. the 40 amp resetting fuses are what scare me. I have never seen a main blow, but the quick resetting 40's popping = a bad day with robots.

I agree on the 40 amp breakers. Once those things heat up, they're really prone to tripping.

With 6 full size CIMs on drive, you can trip the main doing full forward to full reverse. It's scary to think it could happen in a competition. Also, once you've driven for a minute or so, you can get the battery voltage low enough to cause the radio to drop out. Those CIMs can draw 100 amps at stall. It'll take a few seconds for the 40 amps to start tripping, but the 120 amp breaker trips quickly when you try to put 600 amps through it....

[MichaelBick]

Originally Posted by magnets

I agree on the 40 amp breakers. Once those things heat up, they're really prone to tripping.

With 6 full size CIMs on drive, you can trip the main doing full forward to full reverse. It's scary to think it could happen in a competition. Also, once you've driven for a minute or so, you can get the battery voltage low enough to cause the radio to drop out. Those CIMs can draw 100 amps at stall. It'll take a few seconds for the 40 amps to start tripping, but the 120 amp breaker trips quickly when you try to put 600 amps through it....

We ran a 6 motor, 2" wide wheel 6WD last year. We had troubles popping the main breaker but not the 40A breakers. Because your motors are sharing the load the current is actually LESS per motor. Therefor it is actually HARDER to trip the 40A breakers.

[Deke]

Originally Posted by MichaelBick

We had troubles popping the main breaker but not the 40A breakers.

What do you think the root cause of the high current load was from? Pushing, turning, hard accels?

[MichaelBick]

Originally Posted by Infinity2718

What do you think the root cause of the high current load was from? Pushing, turning, hard accels?

The only time we experienced the main breaker popping was when we went from full speed forward to full speed backwards. Adding in a small ramp prevented us from tripping the main again.

[cbale2000]

Originally Posted by magnets

What you said in your previous post was correct, you need proper gearing to take advantage of your motors.

Hence our use of a 24:1 Low Gear + 4in wheels on this design.

Originally Posted by MichaelBick

The only time we experienced the main breaker popping was when we went from full speed forward to full speed backwards. Adding in a small ramp prevented us from tripping the main again.

We've already got our programmers working on this exact thing, we've shredded far too many AM toughbox gears in the past to not know better.



Oh, and for those of you that might not have noticed, I did update the OP with some specs.

[dellagd]

Originally Posted by magnets

Those CIMs can draw 100 amps at stall. It'll take a few seconds for the 40 amps to start tripping, but the 120 amp breaker trips quickly when you try to put 600 amps through it....

Tripping the 120 amp? Never had that happen... Anyone who has, what caused it (that wasn't a short )? Your drivetrain?

Popping that is quite a scary thought...