SCXI-1001 possible overheating

[Knuckles]

    I'm using an SCXI-1001 chassis to aquire analog signals and provide output for controls.  The system had been working perfectly for weeks until, in a recent test, all the input signals were suddenly recorded as zero.  Here are the exact symptoms of the problem:

-only occurs after at least 24 hours of continuous operation
-all analog input signals are recorded as zero; LabView still recognizes that the device is present so no error is generated
-output (switches in an SCXI-1324) is completely functional
-problem can be corrected temporarily by turning the chassis off and on again, but returns within five minutes (give or take 30 seconds)

I am confident that this is not a software issue.  The long onset leads me to believe that it is an overheating problem, but the chassis does not have any noticeable hot stops. 

Any ideas?

[jaced]

HI,

Based on your post it does sound like it is unlikely that it is a software issue but it would be rule it out completely. I am curious to know the environment that your chassis is in. Mainly is there sufficient airflow around the chassis. Also are the fans in working order and the filters clean? Do you have another chassis that you could use to test if this is a hardware failure of caused by the environment. I hope this helps you troubleshoot a little farther please let us know the results.

[Knuckles]

Actually it seems like this was a fuse problem.  I took off the fan at the back to check the fuses and one of them  was loose; the problem hasn't reappeared since.  I may be totally wrong on this, so expect a post if it comes back...

Anyone else who is having problems like this should check out
http://digital.ni.com/public.nsf/websearch/E8064C591C5FDA1A86256A4D00817C1C?OpenDocument

A notable quote:
"You might mistake a chassis failure as a problem with the chassis, when the problems might actually be due to a bad fuse for the analog supply lines. If a chassis is auto-detected, but the modules do not appear to be responding correctly this is often a problem with the auxiliary backplane fuses."

Happy Fusing