Mark;
Yes; been there, done that. Seems
unlikely to me that it is caused by the solid state relay, but . .. . I have a
standard relay for staging, and have always had seamless staging and no issues
with that; but I had serious issues with corruption of settings – MAP table,
pulse setting, staging point all corrupted at various times. Wiring
changes to eliminate possible noise pickup from other leads seemed to help, but
didn’t solve it.
Finally added the following changes to
the board:
1000pf capacitors were added to:
All fuel injector signals
All ignition control signals
RX input
TX output
47uf, 16V tantalum were added to
each processor
Pin 8 of connector is now
grounded.
Pin 28 of connector is now
grounded.
That
solved the problem for me. As we were making these changes and analyzing
causes, both my son (my expert) and Tracy began to think that that isolation
diodes I have in the power circuits, to the EC2 and the injectors and coils, to
maintain independent power redundancy; likely exaggerated the problem by not
letting noise travel back to the battery (the big filter). We never
confirmed this; but likely you would not have to go to the same lengths in filtering
if you did not have diode isolation of the circuits.
Four
more hours of flight time this week – just past 75 hours. Real
happy with my cruise at 200 mph (TAS) and 22 mpg.
Al (Velocity RG 20B)
To refresh your memory, I recently installed the solid state
staging relay on my 20B Lancair ES. When doing the install, I didn't
reinstall the diode (to ground). During a short test flight after
installing the solid state relay, the map table got corrupted. I wrote
for your advice and you instructed me to connect the diode. I reinstalled
the diode to the staging relay and went for a short 30 minute flight
today. The "A" map table again got corrupted. Switching
to the "B" controller resulted in a smooth running engine.
After landing, I entered the EM-2 tracking mode and it was obvious that the
"A" map table was again corrupted. I have not reloaded
the default map, in case you would like to take a picture of the EM-2 display
of the map table.
These are the only two instances of this happening that I can recall, both
cases happened after I installed the solid state injector staging relay.
Could the relay possibly be related?
Also, I understand that others with composite a/c have had problems similar to
this (sporatic corruption of the MAP table). Have you been able to
determine a common cause? Any suggestions?
I am posting this to the fly rotary group in hopes that someone on the list may
have already "been there, done that".
Thanks,
Mark S.