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Re: Two Roboclaw 2x200A show no status LEDs, do not enumerate on USB bus

Posted: Tue Mar 12, 2019 10:23 am
by Basicmicro Support
Just to confirm, these were working ok initially and then stopped?

I will try contacting you directly using the information in the invoice. If you dont hear from me by the end of the day please call 800-535-9161.

If they just stopped working there are couple things that can damage controllers that are non-obvious. For example, if you disconnect power and then start pushing wheeled vehicles around you dcan cause enough regeneration that it will ramp up voltage on the controllers to dangerous levels. To prevent this problem you need to make sure you have a diode to bypass your power contactor which will provide a path back to the battery when the battery is otherwise disconnected.

Alternatively a volce clamp can be added which will disipate the regen energy(even when not powered from the battery if regen raises the voltage too high.

Since no lights are coming up I suspect the high voltage logic switching regulator may have been damaged(also a symptom of regen induced over voltage though there are other possibilities).

I'll go over this and any possible other causes when I call.