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miox_24



Joined: 07 Jul 2008
Posts: 5
PostPosted: Fri Jul 11, 2008 9:27 am    Post subject: RTU's Reply with quote
Very Happy hi there, me again, does any one have any ideas about remote terminal units? its used to monitor field devices such as pumps, switchgears, motors, etc, i need help in analyzing & fixing a texas instrument rtu here in my worksite, thanks
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vtech



Joined: 08 May 2006
Posts: 1264
Location: USA
PostPosted: Fri Jul 11, 2008 6:37 pm    Post subject: Re: RTU's Reply with quote
miox_24 wrote:
Very Happy hi there, me again, does any one have any ideas about remote terminal units? its used to monitor field devices such as pumps, switchgears, motors, etc, i need help in analyzing & fixing a texas instrument rtu here in my worksite, thanks


Not too familiar with RTU's, but I do know that in industrial applications, the "interface" section tends to be more susceptible due to constant exposure to outside data and possible spikes/surges.
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miox_24



Joined: 07 Jul 2008
Posts: 5
PostPosted: Fri Jul 11, 2008 9:25 pm    Post subject: Re: RTU's Reply with quote
vtech wrote:
miox_24 wrote:
Very Happy hi there, me again, does any one have any ideas about remote terminal units? its used to monitor field devices such as pumps, switchgears, motors, etc, i need help in analyzing & fixing a texas instrument rtu here in my worksite, thanks


Not too familiar with RTU's, but I do know that in industrial applications, the "interface" section tends to be more susceptible due to constant exposure to outside data and possible spikes/surges.


thanks, well in my case the "interface" is my digital input card, i did replaced it with a spare card but its still d same, when i replaced the main rtu board it worked fine, so now i have to find out which part of the main rtu board must be checked, ive noticed 8 optoisolators in the input ckt block of the board, and the outputs of those optoisolators are connected to some digital IC's i need help in analyzing where to start my repair thanks
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vtech



Joined: 08 May 2006
Posts: 1264
Location: USA
PostPosted: Sat Jul 12, 2008 4:39 am    Post subject: Reply with quote
Without documentation or knowing the symptoms I am not aware of any magical way to determine a cause in any feedback loop/control circuit.
Depending on the problem you may have signal or drive issues for a single or multiple devices? Perhaps some voltage readings &/or monitoring communication lines during operation may reveal a clue. You mentioned optoisolators; they are generally reliable but can &will cause problems in any circuit.
While I have always prefered component-level t-shooting and the culprit on the board may be a simple device, unless you are set up with test jigs/prints for simulation, it can be rather unproductive & simply not worth the time. The Dud/exchange program instituted by some brands are the direct result.
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