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Unread 14-03-2011, 23:05
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DonRotolo DonRotolo is offline
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Join Date: Jan 2005
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Re: Unexplained intermittent CAN / 2CAN Jaguar problems at GSR

Quote:
Originally Posted by techhelpbb View Post
If it were a breaker issue, I would expect it to trip and stay that way.
You'd be wrong. They trip for anywhere from a fraction of a second to a second or two. Self-resetting.
Quote:
Originally Posted by techhelpbb View Post
multimeter for resistance from the lugs that would go on the Jaguar back to the power board.

A multimeter was applied to the Jaguar input power while it was run off the ground no major issues were noted (but multimeters are fairly slow to measure).
Nyet. Measure voltage drop along the wire - from power board to input screw, and output screw to motor connector - while passing high current. Only way to spot a bad wire (in this case) is under load. An Ohmmeter will steer you wrong.
Quote:
Originally Posted by techhelpbb View Post
When the robot was misbehaving I did put an oscilloscope one the power supply once it was stationary and I saw no major issues that would account for the fact that the Jaguars at that time were basically locked up.
When they are 'locked up' there's no current draw, you won't see anything of interest - too late in the process.

I think 1676 will be visiting 11 soon, we'll look at the practice bot with you then.

Back to basics. Maybe build a test platform without external influences - just the bare basics - and see if you can reproduce it on the bench. Time-consuming, yes, but ultimately can be valuable. And it'll keep the students involved.
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