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Sherlock Ohms

No Pressure on the Pressure Gauge

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Nancy Golden
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Re: Error Codes
Nancy Golden   9/24/2013 1:05:34 PM
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That was my first thought too, OLD_CURMUDGEON = WISDOM_FROM_EXPERIENCE about it being both a cost-saving move and also to reduce redundancy...

As a test engineer, one of my tasks when building a test set for the production floor in Mexico was to try to envision possible failure modes (both hardware and software) and come up with a reasonable way to flag them, without being "overzealous." Often, a strategic LED indicator or software error code had much the same job and we would have to depend on reasonable troubleshooting expertise when an unusual failure occured. Visual confirmation of pressure is not a stretch, but depending on how complex the system is, it can take awhile to find - such is the nature, and challenge, and fun, (if a million dollar dealine is not involved) of electronics...

We usually get to a point where those are bells and whistles and while they can be fun to add in - budgetary constraints limit them to the ones deemed most necessary.

OLD_CURMUDGEON
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Platinum
Re: Error Codes
OLD_CURMUDGEON   9/24/2013 9:22:22 AM
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Nancy, I hate to sound like the OLD_CURMUDGEON that I really am, but I suspect that the lack of additional feedback via a pressure sensor was a cost-saving move.  No doubt the unloader valve design had proven itself to be extremely reliable & durable, so a decision was made to use ONLY the LED to indicate that an electric signal was present, and let it go at that.  There comes a time in the design cycle when you can add so much redundancy or observation implements that the machine becomes a monster of its own.  I've seen examples of that in the past where a basic machine concept grew to almost unlimited bounds because of overzealous thinking, sort of on the lines of, "since we can, LET'S......!"  and that ain't gudd engineering......

ADIOS!

Nancy Golden
User Rank
Platinum
Error Codes
Nancy Golden   9/23/2013 12:13:44 PM
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"While the machine ran production, I was watching the pressure gauges for a couple of hours. I happened to notice the unloading valve LED come on to indicate it was energized, but the pressure gauge still showed no pressure. That's when the machine failed on the oscillation encoder error." Great job finding the root cause. I guess it would have been nice to have an error code for "no pressure detected when unloading valve is energized" rather than an LED indicating the valve had been energized when in reality it was defective. Of course it is often difficult to know what the failure modes will be and how many sensors are needed and where...

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