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Just wondering - are the ECU and EM2 designed to run at 14.7V? Or is there some sort of internal regulator that drops it down to the actual operating voltage? If the latter is so, one might [partially?] bypass the regulator. Sort of like the automotive ignition systems that were designed to run at 9-10V and had a ballast resistor to drop charging voltage to operating voltage which was bypassed during engine cranking.
Just a brain fart as I don't know ANY internal details of EM2 ... Jim S.
Alex Madsen wrote:
It seems to me a good solution to this would be to add a voltage regulator
that can run the ECU and EM2 at a lower voltage (say 6V). This would avoid
some frustration with low batteries on the ground and I think add safety
allowing longer flight times with a dead alternator.
Alex Madsen
-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Todd Bartrim
Sent: Tuesday, January 18, 2005 1:31 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: New discovery...
I believe that the EM2 is set to give this alarm. My bottom line on
the
screen will flash "BATTERY VOLTAGE TOO LOW" at ~9 volts, IIRC. When I'm
cranking it when it's too darn cold to start, I can hear it trying to fire
but as soon as the voltage drops far enough that the warning appears, it
will no longer try to fire. Then out come the jumper cables :-(
When Tracy finishes vacationing or building Rusty's parts or trouble
shooting for John or Bernie, maybe he'll come back to us lost souls and
clarify this for us.
Cheers...
Todd.
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