| Author |
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| vtech |
 Posted: Sat Jul 12, 2008 4:39 am Post subject: |
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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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| miox_24 |
| Posted: Fri Jul 11, 2008 9:25 pm Post subject: Re: RTU's |
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| vtech wrote: |
| miox_24 wrote: |
 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 |
| Posted: Fri Jul 11, 2008 6:37 pm Post subject: Re: RTU's |
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| miox_24 wrote: |
| 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 |
| Posted: Fri Jul 11, 2008 9:27 am Post subject: RTU's |
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| 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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