Today's Message Index:
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1. 01:42 AM - ATT Email Errors (danderson1)
2. 07:21 AM - Re: Battery discharge during normal cruise (Paul Zimmer)
3. 09:38 AM - Re: Battery discharge during normal cruise (William Daniell)
Message 1
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| Subject: | ATT Email Errors |
Are you using Att email (http://www.email-customer-care.com/att-support) for sending and receiving mail and other important files? If yes then you are using the best email because Att email is secure paid email as compared with other emails. Like other emails, Att has several important and attractive features that you can get from our At&t email website. We are here for the ATT Mail (http://www.email-customer-care.com/att-support) problems and there are several types of errors we get with ATT email like At&t Email Not Working On My Devices, At&t net email problem, Unable to sign in, and Unable to recover AT&T email (http://www.email-customer-care.com/att-support) account. If you are facing any of these errors with your Att email account that contacts us for help. And visit the given website for more information.
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http://www.email-customer-care.com/att-support
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Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=495162#495162
Message 2
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| Subject: | Re: Battery discharge during normal cruise |
Charlie, I too am beginning to suspect the sensor wiring is the likely
source of the reported current flow. While my sensors do not employ inline
fuses, I chose to use a molex connector forward of the firewall for a
number of engine parameter data leads that feed the EIS, including my two
current sensors. A less than optimal mating of the pins at this connector
could introduce a resistance variation error you describe. Additionally,
there is another point in the data line circuit where excitation voltage
required by the sensor is introduced, which could also be suspect. I will
pursue investigation of both, and update the thread with my findings.
Thanks
Paul
On Wed, Mar 4, 2020 at 11:46 AM Charlie England <ceengland7@gmail.com>
wrote:
> On 3/4/2020 9:23 AM, Robert L. Nuckolls, III wrote:
>
> What doesn't make sense to me is there are periodic and frequent current
> flows to/from the battery (1 to 5 amps) during normal cruise operations,
> this during periods of static and relatively light load (12-15 amps) on t
he
> electrical system, much smaller than the capacity of the 60A Plane Power
> alternator. =C3=82 =C3=82 I would expect all power to be supplied direct
ly from the
> alternator as it is supplying the current at a higher voltage (~14.5v or
> so) than the battery.=C3=82 These periods of flow to/from the battery ar
e short
> in duration normally lasting only a few seconds.
>
> Is this normal and to be expected, or does it suggest a problem with the
> internally regulated alternator, or perhaps with the current sensor itsel
f?
>
>
> It's not 'normal' but it might not be
> significant. Current flows into and out
> of the battery are manifestations of
> and exchange of energy into or out of
> the battery.
>
> The battery's physics tells us that significant
> energy flows out of the battery at sustained
> voltages well below the normal bus voltage . . .
> some value below 13 volts.
>
> Since you're not reporting a commensurate
> drop in bus voltage associated with these transients,
> * I am inclined to consider an anomaly in the*
> * data gathering/interpretation/display for*
> * battery current*.
>
> Has this always existed with this configuration?
> Given the absence of corroborating data I
> think I'd just wait and see what happens. In
> any case, I don't see a cause for concern.
>
> Bob . . .
>
> Bolded segment above reminded me of this:
>
> My Dynon EMS D10 frequently and randomly shows a variable, up to 9A,
> discharge (negative current) with stable voltage. I discovered that the
> current shunt has a couple of inline fuse holders for glass fuses, and
> wiggling the fuse holders will make the negative readings go away. Obviou
s
> takeaway is that excess resistance in the sense lines confuses the curren
t
> measurement, quite badly.
>
> Charlie
>
>
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Message 3
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| Subject: | Re: Battery discharge during normal cruise |
Charlie re DYNON
Interesting. My dynon skyview will run up to 60a before i get the red x
over the read out. It will then return and stabilize to 7-10a depending
on the load - the normal. 60a from a rotax alternator is a little
optimistic so I was not too worried in flight. I installed an separate
hall effect sensor and round gauge on the fat wire to the battery and this
shows no relation to the Dynon read out. My conclusion is that this is
something to with the Dynon shunt and system. I have hunted for the fault
without success.
Will
William Daniell
+1 786 878 0246
On Wed, Mar 4, 2020, 11:46 Charlie England <ceengland7@gmail.com> wrote:
> On 3/4/2020 9:23 AM, Robert L. Nuckolls, III wrote:
>
> What doesn't make sense to me is there are periodic and frequent current
> flows to/from the battery (1 to 5 amps) during normal cruise operations,
> this during periods of static and relatively light load (12-15 amps) on t
he
> electrical system, much smaller than the capacity of the 60A Plane Power
> alternator. =C3=82 =C3=82 I would expect all power to be supplied direct
ly from the
> alternator as it is supplying the current at a higher voltage (~14.5v or
> so) than the battery.=C3=82 These periods of flow to/from the battery ar
e short
> in duration normally lasting only a few seconds.
>
> Is this normal and to be expected, or does it suggest a problem with the
> internally regulated alternator, or perhaps with the current sensor itsel
f?
>
>
> It's not 'normal' but it might not be
> significant. Current flows into and out
> of the battery are manifestations of
> and exchange of energy into or out of
> the battery.
>
> The battery's physics tells us that significant
> energy flows out of the battery at sustained
> voltages well below the normal bus voltage . . .
> some value below 13 volts.
>
> Since you're not reporting a commensurate
> drop in bus voltage associated with these transients,
> * I am inclined to consider an anomaly in the*
> * data gathering/interpretation/display for*
> * battery current*.
>
> Has this always existed with this configuration?
> Given the absence of corroborating data I
> think I'd just wait and see what happens. In
> any case, I don't see a cause for concern.
>
> Bob . . .
>
> Bolded segment above reminded me of this:
>
> My Dynon EMS D10 frequently and randomly shows a variable, up to 9A,
> discharge (negative current) with stable voltage. I discovered that the
> current shunt has a couple of inline fuse holders for glass fuses, and
> wiggling the fuse holders will make the negative readings go away. Obviou
s
> takeaway is that excess resistance in the sense lines confuses the curren
t
> measurement, quite badly.
>
> Charlie
>
>
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