mlas(at)cox.net
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 Posted: Sun Feb 01, 2009 8:28 am Post subject: Bob Nuckolls's Z-14 with dual Lightspeed iii and SD-8 |
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Bob,
I have had to do one inflight reset on the Plasma III on one system
once. The reset was successful and power was restored to the unit. I
removed the unit and sent it back to Klaus for inspection. The fault
was determined to be an overheat situation. That unit was located in
an area without any real ventilation and without an form of cooling
while operation in Arizona during the summer. the compartment temp
was estimated to have exceeded 200 deg. F. The unit was modified to
the latest version (lower heat output components and a ventilation
port. The aircraft was modified to provide air circulation in that
compartment. After 300+ hours on that unit no faults noted. The
point, when the unit faulted it tripped the CB and was then reset and
provided service throughout the remainder of that flight.
Mike Larkin
On Jan 31, 2009, at 2:28 PM, bcondrey wrote:
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>
Food for thought for those with dual LSE ignitions (like me). I was
talking with Klaus about his CB recommendation vs fuses and he said
that the ignitions (at least the Plasma IIIs that I have) have an
internal crowbar circuit to protect the ignition from an overvoltage
event. Reason for the CB recommendation was so that in the unlikely
case of an OV event the pilot could pull the alternator CBs, reset
the ignition CBs and continue flight.
This was the first time I'd ever heard this and it scared me A LOT
because I've got mine wired through my battery buss fuse blocks
(Z-14). While I've never had a problem and haven't heard of anybody
else having a problem, I plan to redo the ignition power wiring and
switch to CBs.
Bob
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 27907#227907
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