Chief Delphi - Blown up electrical board

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- Electrical (http://www.chiefdelphi.com/forums/forumdisplay.php?f=53)

- - Blown up electrical board (http://www.chiefdelphi.com/forums/showthread.php?t=74891)

crake

19-02-2009 10:59

Re: Blown up electrical board

Quote:

Originally Posted by Alan Anderson (Post 824544)

What post said that? I'd like to know which connector it was talking about.

Either way, the cRIO has reverse voltage protection up to +/- 35V, so it is hard to imagine damaging a cRIO by connecting up any of the power system voltages in any particular order.

Mike AA

19-02-2009 15:46

Re: Blown up electrical board

Quote:

Originally Posted by RyanN (Post 824523)

A = W / V

So 20W at 24V = 20W/24V = 10W/12V = 5W/6V = .83A Max

So if you measure the current from the Power Distribution Board to the cRIO, it should not go past .83A. If it does, then it's the cRIO, if not, it's the PDB.

Actually, the wattage of the cRIO would stay the same at 20 watts and the current would INCREASE with a lower voltage, so if the main battery starts running really low and the converter isn't running as efficiently and not outputting 24 volts, perhaps 22volts or 20volts the current would increase proportionally. so the cRIO could possibly draw more than .83A.

-Mike

crake

19-02-2009 16:51

Re: Blown up electrical board

Except the cRIO is no where near fully loaded, so actual consumption is less than the 20W listed. But yes, current will go up as voltage goes down, until shutdown at ~15V (or so) when current will drop, along with power to the processor, FPGA, and I/O.

RyanN

19-02-2009 17:12

Re: Blown up electrical board

Quote:

Originally Posted by Mike AA (Post 824929)

True, that's why I put in all the math. :D

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