hdwysong(at)gmail.com
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 Posted: Tue Jul 17, 2007 1:36 am Post subject: best contactor reliability -- mechanical, solid,state, or ma |
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The system is 25 ADC (worst case) at 28 VDC with a nominal
load of about 17 ADC.
The spec environment (vibe, temp) is similar to the Summer
cockpit of my C150 with a prop that needs to be dynamically
balanced. Worse than a lab bench but better than under the
hood of a Hummer. All components are rated for -40 C to +85
C (operating) thus far.
Unfortunately, there are no "non-critical" components in the
system so ANY power loss is bad news.
Again, I'm trying to weigh the pros/cons of mechanical,
solid-state, or manual master battery contactors for this
application. I considered using parallel contactors (as
suggested here) to avoid the single point contactor failure
but found myself staring down the slippery slope of
increased parts count and complexity.
Perhaps the "best" answer is a manual contactor with dual
contacts (one of those big 1/2/Both switches). ???
Any guidance (including "shut up, quit worrying, and use the
darn can!") will be appreciated. 
D
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| Quote: | >> I have a remotely operated application where the loss of the master
>> battery contactor will result in the loss of data/money/time (...
>> and dignity!). My baseline design resembles a "Z" diagram (thanks
>> Bob!) and I planned to use a mechanical, continuous duty contactor
>> like the S-701 from B&C. However, a buddy of mine recently
>> experienced a contactor failure in flight and it caused me to
>> experience a few "What If!?" nightmares. I'm back to reconsidering
>> my original decision...
Help us with a bit more information about your application.
What kind of vehicle? What kind of environment? What's the
energy requirement to maintain data in vulnerable systems.
It's often much easier to arrange for brownout and/or momentary
power loss for a few items than to back-up the whole system.
Finally, it's almost always better to have a plan-a/plan-b
modus operandi than to scratch around for "more reliable"
hardware. EVERYTHING will break at some point in time.
Give us a rundown of your equipment that must stay awake
and what the power requirements are.
Bob . . .
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