nuckolls.bob(at)aeroelect
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 Posted: Sat Jun 21, 2014 6:31 pm Post subject: fuse link to replace fuse in low current applications? |
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The case I'm aware of involves a glass-cockpit display and a
points-and-coil ignition, which when connected to the ignition lead
caused missing, and would sometimes cut out entirely at higher rpm. I
do not know what the failure mode was, but the makers of this device
didn't seem to understand that the spikes on the line could easily
exceed 200 volts. It was rumored that the bypass capacitors on the
input lines were rated at 50 volts, although I have not confirmed
that (which is also why I am not identifying the device.) You can see
what would happen if the spikes caused arcing in a bypass cap, which
then failed. The point is, an external resistor would both provide
the attenuation needed and prevent a failure. You could test it by
grounding the instrument end, or connecting it to +12, and confirming
the engine would still run properly no matter what happened.
Clearly, any supplier is remiss in their
duty when offering an accessory designed to get
rpm data from the ignition system without
vetting failure modes effects. If
ANYONE becomes aware of a same or similar
case, pleased let me know about it.
The work-arounds are simple and safe . . .
it's been done with reliability for
decades. I'd be pleased to get in touch
with designers to see if a fix can be
implemented.
It borders on foolish to spend a bucket
load of $time$ on the development and
marketing of otherwise useful product
with easily cured nasty habits.
Bob . . .
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