Today's Message Index:
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1. 12:17 AM - Re: Jabiru electric circuit design, your comments?? (jetboy)
2. 12:06 PM - Amp Meter (BobbyPaulk@comcast.net)
3. 12:49 PM - Re: Amp Meter (Mark Hubelbank)
4. 01:01 PM - Re: Amp Meter (Rob Turk)
5. 01:57 PM - Re: Amp Meter (Garth Knowles)
Message 1
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| Subject: | Re: Jabiru electric circuit design, your comments?? |
Rob
your placement of the OVM is not the same as Z20 or Z21 because you have changed
the way S1 (S1 and S2 in your diagram) are wired. I cannot offer a different
method as I don't use the OVM but if you are using one it would be safer to stick
with the proven design as I found in your diagram the alternate path available
through the master contactor coil which does not exist in Bob's designs
and there may be other scenarios I have not noticed.
Note the regulator sense and output wires also tied together, yes I agree Jabiru
airframes disobey their installation instructions for the engine and the airframes
also disregard AC-43 wiring rules such as the use of aluminium bus bars
clamped with AN hardware via fibreglass without spring washers or aluminium packing
washers - this is a problem waiting to happen both from corrosion and joint
loosening point of view so please check this area frequently.
Ralph
--------
Ralph - CH701 / 2200a
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=317557#317557
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List,
While we are on the subject. I have a digital Amp Meter in the Dynon DEK 180. The
output of the Alt. from the Jab. 3300 varies wildly from a minus to plus 15
or 20. It never settles down to a steady rate either with a heavy load, marginal
load or no load. I am using the Kubota regulator ( I think ). Can anyone tell
me if this problem can be rectified : ) pun intended.
Bobby
Jacksonville, Fl.
Message 3
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Bobby,
I have exactly the same combination. I believe what you are seeing
is the combination of the slightly quarky current reading system in the
Dynon combined with the less than smooth regulation mode of the regulator.
That said, my system varies on the order of +/- 5 amps most of the
time with occasional peaks that are greater.
I assume you have verified that there are no bad connections
anywhere in the electrical system.
If the voltage is being held at a fairly constant (I would say
14.0-14.5V) at over 2000 RPM, I would not worry too much. Still these
swings are a bit higher than I see.
The regulator depends on the sampling lead having a noise free
connection to the battery. The wiring from the sampling lead (I believe
it was pin 5 on the connector) needs have a very low resistance path to
the battery.
The other thing is that this type of regulator also assumes that
the battery is well behaved - as in good condition. As the battery ages,
you will probably get larger voltage/current swings than with a
conventional field current type regulator.
On 10/31/2010 3:03 PM, BobbyPaulk@comcast.net wrote:
> List,
> While we are on the subject. I have a digital Amp Meter in the Dynon
> DEK 180. The output of the Alt. from the Jab. 3300 varies wildly from
> a minus to plus 15 or 20. It never settles down to a steady rate
> either with a heavy load, marginal load or no load. I am using the
> Kubota regulator ( I think ). Can anyone tell me if this problem can
> be rectified : ) pun intended.
>
> Bobby
> Jacksonville, Fl.
> *
>
>
> *
--
Mark Hubelbank
NorthEast Monitoring
2 Clock Tower Place
Suite 555
Maynard, MA, 01754 - USA
mhubel@nemon.com
978-443-3955
Message 4
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Bobby,
Where in the circuit do you have the shunt wired in? It should be
somewhere on the DC side of the regulator. If you have the shunt on the
AC side (in series with one of the pale blue wires) then that would
explain your observation.
Rob
On 10/31/2010 8:03 PM, BobbyPaulk@comcast.net wrote:
> List,
> While we are on the subject. I have a digital Amp Meter in the Dynon
> DEK 180. The output of the Alt. from the Jab. 3300 varies wildly from
> a minus to plus 15 or 20. It never settles down to a steady rate
> either with a heavy load, marginal load or no load. I am using the
> Kubota regulator ( I think ). Can anyone tell me if this problem can
> be rectified : ) pun intended.
>
> Bobby
> Jacksonville, Fl.
> *
>
>
> *
Message 5
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Bobby, et al,=0A=0AI have the same issue and about the same swings with my
Dynon 180 and Jab 3300.- =0AI would get high and low alarms, almost no ma
tter where I set them ... very =0Aannoying, especially to a passenger.- A
ll connections were checked and secure. =0A-I concluded the readings were
effectively useless.- There has been some =0Adiscussion on this on the D
ynon Forum as others (but not everyone) are having =0Athis issue as well.
- One possible conclusion was that the issue has something to =0Ado with
how the Dynon processes the small mv readings across the shunt.-As what
=0Ais hopefully a temporary measure until a fix is found or available, I in
stalled =0Aan inexpensive automotive type analog ammeter gauge and disabled
the alarms in =0Athe D180.- The readings with the new meter are very ste
ady and predictable, ie =0Aslightly negative at idle/low rpm and then sligh
tly positive as rpms are =0Aincreased, until the battery is fully recharged
and then it reads very close to =0Azero.- Yet the Dynon readings are bou
ncing wildly.=0A=0AFYI=0A=0AGarth=0A=0A=0A=0A______________________________
__=0AFrom: Mark Hubelbank <mhubel@nemon.com>=0ATo: jabiruengine-list@matron
ics.com=0ASent: Sun, October 31, 2010 3:46:36 PM=0ASubject: Re: JabiruEngin
e-List: Amp Meter=0A=0ABobby,=0A--- I have exactly the same combinati
on. I believe what you are seeing is the =0Acombination of the slightly qua
rky current reading system in the Dynon combined =0Awith the less than smoo
th regulation mode of the regulator.=0A--- That said, my system varie
s on the order of +/- 5 amps most of the time with =0Aoccasional peaks that
are greater.=0A--- I assume you have verified that there are no bad
connections anywhere in the =0Aelectrical system.=0A--- If the voltag
e is being held at a fairly constant (I would say 14.0-14.5V) =0Aat over 20
00 RPM, I would not worry too much. Still these swings are a bit =0Ahigher
than I see.=0A--- The regulator depends on the sampling lead having a
noise free connection to =0Athe battery. The wiring from the sampling lead
(I believe it was pin 5 on the =0Aconnector)- needs have a very low resi
stance path to the battery.=0A--- The other thing is that this type
- of regulator also assumes that the =0Abattery is well behaved - as in g
ood condition. As the battery ages, you will =0Aprobably get larger voltage
/current swings than with a conventional field =0Acurrent type regulator.
=0A=0AOn 10/31/2010 3:03 PM, BobbyPaulk@comcast.net wrote: =0AList,=0A>Whil
e we are on the subject. I have a digital Amp Meter in the Dynon DEK 180.
=0A>The output of the Alt. from the Jab. 3300 varies wildly from a minus to
plus 15 =0A>or 20. It never settles down to a steady rate either with a he
avy load, marginal =0A>load or no load. I am using the Kubota regulator ( I
think ). Can anyone tell me =0A>if this problem can be rectified : ) pun i
ntended.=0A>=0A>Bobby=0A>Jacksonville, Fl. =0A> =0A=0A-- Mark Hubelb
ank NorthEast Monitoring 2 Clock Tower Place Suite 555 =0AMaynard, MA,
01754 - USA mhubel@nemon.com 978-443-3955=0A=0A
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