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If the voltage is steady at 13.8 while the amperage is fluctuating from
plus 15 amps to minus 50 amps, then either the voltmeter is broken or the
amperage reading is incorrect. My guess is the amperage reading is
wrong. Is there some kind of electromagnetic interference that is causing
the amp reading and the fuel gauges to go haywire at the same time? Is the
hydraulic pump cycling every five minutes and doing this? I don't think
hydraulic pumps are common antagonists, but I can't think of anything else that
might cycle every five minutes. It's always a good idea to check grounds,
but my guess is EMI.
Interesting problem!
Dennis
----- Original Message -----
Sent: Tuesday, October 25, 2011 6:00
PM
Subject: [LML] Re: Problem with
Fluctuating Amperage
Voltage reads steady at 13.8
volts. Amp drop is on the EIS unit, so the EFIS unit is not the
cause. Good idea on downloading data.
Dave T.
From: Lancair Mailing
List [mailto:lml@lancaironline.net] On Behalf Of Dennis
Johnson
Sent: 10-25-11-Tue 14:01
To: lml@lancaironline.net
Subject:
[LML] Re: Problem with Fluctuating Amperage
What is the
voltage reading during this time? Does the Grand Rapids EFIS Sport
record data that you can download and study after a flight?
----- Original
Message -----
Sent: Tuesday, October
25, 2011 4:50 AM
Subject: [LML] Problem
with Fluctuating Amperage
Any ideas about what would cause my amperage to start
fluctuating wildly about 5 minutes into a flight?
It starts out fine
after takeoff at 15 amps and then goes to -50 amps for 30 seconds, and then
gyrates between 5 amps and -50 amps for a minute and then goes back to
normal. It repeats this sequence every 5 minutes.
My fuel gages also
go down to zero during this episode and then back to normal.
Is my
B&C LR3C Linear Regulator going bad?
(I'm getting these readings
from my Grand Rapids EIS engine monitor. It's hooked up to a Grand Rapids
EFIS Sport.)
Thanks for the help!
David T.
Legacy
RG
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