Today's Message Index:
----------------------
1. 12:56 AM - Re: Rotax 912 Battery Discharging Problem (joeing701@simnet.is)
2. 04:55 AM - Re: Rotax 912 Battery Discharging Problem (FLYaDIVE)
3. 05:07 AM - Re: Rotax 912 Battery Discharging Problem (FLYaDIVE)
4. 06:38 AM - Re: Rotax 912 Battery Discharging Problem (Catz631@aol.com)
5. 07:42 AM - Re: Rotax 912 Charging Problem (Roger Lee)
6. 08:55 AM - Re: Rotax 912 Battery Discharging Problem (Noel Loveys)
Message 1
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| Subject: | Re: Rotax 912 Battery Discharging Problem |
Hello Rotax owners Bill and Hugh.
One question about the connection of the Regulator/rectifier.
Do you have the C wire connected directly to the battery? If so, it will drain
the battery. Connect it to the battery relay.
Best regards,
Johann G.
Rotax 912 UL
Zenith 701
----- Upprunalegt skeyti -----
Fr: "bnelson79" <bnelson79@embarqmail.com>
Til: rotaxengines-list@matronics.com
Sent: Sunnudagur, 20. mars, 2011 01:37:06 GMT +00:00 Monrovia
Efni: RotaxEngines-List: Rotax 912 Battery Discharging Problem
I am having a similar problem to the one Hugh McKay had a few years ago. My problem
though is simply that the battery is not being charged. The voltmeter show
12 volts at startup and slowly drains down from there (faster if I turn accessories
on). Noticed this while flying yesterday when the voltmeter was pegged
on the high end. Landed and suddenly started getting a lot of static in headset.
Turned off heater and static disappeared, but voltmeter dropped to zero. Noticed
landing light had been accidentally turned on - turned off and volt needle
swung to high side again. As I turned switches off the needle would swing
from high to low. Finally shut down. But when I tried to restart volt meter read
only around 9 volts and engine wouldn't turn over at all. Recharged battery
today and engine started with 12 volts showing and none of the other switching
problems. But juice continued to dribble away.
Any suggestions??? Bad ground??? Bad regulator???
Bill Nelson
Prosser, WA
N6576E
[quote="hgmckay"]
Quote:
I have a Rotax 912 UL engine on an Allegro 2000 LSA. Recently I have had to replace
my battery (12V 18Ah) because of it's inability to crank the engine. Prior
to replacing the battery I noticed my combination Volt/Amp meter showed only
12 volts while flying. Usually the voltmeter shows about 13.5 volts at start-up
while the engine is running on the ground and while flying. After replacing
the battery, and starting the engine the voltmeter returned to 13.5 volts. However,
when I began to close certain circuit breakers engaging the front landing
light, the two wing tip landing lights, the two wing tip strobes, and the nav.
lights I noticed the volt meter dropping back each time I engaged one of the
breakers until finally the volt meter again was indicating only about 12 volts
just as before. I have a "no charge" red light in the battery charging circuit
that comes on if the battery is not being charged while the engine is running.
This light normally does not come on unless th!
e engine is at very low rpm ( aprx.1400 rpm). This is not normal for my engine
for my idle speed is set at 1800 rpm.
I do not know why the voltage is dropping each time I close the breaker for lights
described above, or what may be causing the voltage drop. I know I have a
good battery, but I don't know if my regulator is going bad, or if there may be
aground some where, or somthing else. Can anyone shed any light on what may
be causing this? The engine has only 255 hours on it and I have not had any other
problems with the engine. Any help would be greatly appreciated.
Hugh G. McKay III
Allegro 2000
Rotax 912 UL
N661WW
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=334471#334471
Message 2
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| Subject: | Re: Rotax 912 Battery Discharging Problem |
Bill & Hugh:
You both identified your problem... One same problem.
The charging circuit is NOT working.
Why is it not working?
Well there you will have to pull out the VOM and start taking readings...
Voltage and Resistance.
1 - Start with removing and cleaning ALL connections in the circuit...
Battery, Voltage Regulator (VR), Circuit Breakers , etc.
2 - REPLACE all lock washers.
3 - CHARGE the battery off a battery charger to verify the battery is:
a> Good
b> Can hold a charge
c> Has power to excite the VR - No Excite No charge.
4 - If you have one of those solid magnetic alternators... SORRY! But check
for loose & broken magnetics.
For a battery to charge you NEED 13.8 to 14.2 VDC. Any less than that and
you will CONSTANTLY be draining from the battery until... YOU HAVE WHAT YOU
HAVE NOW!
Barry
On Sat, Mar 19, 2011 at 9:37 PM, bnelson79 <bnelson79@embarqmail.com> wrote:
> bnelson79@embarqmail.com>
>
> I am having a similar problem to the one Hugh McKay had a few years ago. My
> problem though is simply that the battery is not being charged. The
> voltmeter show 12 volts at startup and slowly drains down from there (faster
> if I turn accessories on). Noticed this while flying yesterday when the
> voltmeter was pegged on the high end. Landed and suddenly started getting a
> lot of static in headset. Turned off heater and static disappeared, but
> voltmeter dropped to zero. Noticed landing light had been accidentally
> turned on - turned off and volt needle swung to high side again. As I turned
> switches off the needle would swing from high to low. Finally shut down. But
> when I tried to restart volt meter read only around 9 volts and engine
> wouldn't turn over at all. Recharged battery today and engine started with
> 12 volts showing and none of the other switching problems. But juice
> continued to dribble away.
> Any suggestions??? Bad ground??? Bad regulator???
>
> Bill Nelson
> Prosser, WA
> N6576E
>
>
> [quote="hgmckay"]
> Quote:
> I have a Rotax 912 UL engine on an Allegro 2000 LSA. Recently I have had to
> replace my battery (12V 18Ah) because of it's inability to crank the engine.
> Prior to replacing the battery I noticed my combination Volt/Amp meter
> showed only 12 volts while flying. Usually the voltmeter shows about 13.5
> volts at start-up while the engine is running on the ground and while
> flying. After replacing the battery, and starting the engine the voltmeter
> returned to 13.5 volts. However, when I began to close certain circuit
> breakers engaging the front landing light, the two wing tip landing lights,
> the two wing tip strobes, and the nav. lights I noticed the volt meter
> dropping back each time I engaged one of the breakers until finally the volt
> meter again was indicating only about 12 volts just as before. I have a "no
> charge" red light in the battery charging circuit that comes on if the
> battery is not being charged while the engine is running. This light
> normally does not come on unless th!
> e engine is at very low rpm ( aprx.1400 rpm). This is not normal for my
> engine for my idle speed is set at 1800 rpm.
>
> I do not know why the voltage is dropping each time I close the breaker for
> lights described above, or what may be causing the voltage drop. I know I
> have a good battery, but I don't know if my regulator is going bad, or if
> there may be aground some where, or somthing else. Can anyone shed any light
> on what may be causing this? The engine has only 255 hours on it and I have
> not had any other problems with the engine. Any help would be greatly
> appreciated.
>
> Hugh G. McKay III
> Allegro 2000
> Rotax 912 UL
> N661WW
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=334471#334471
>
>
Message 3
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| Subject: | Re: Rotax 912 Battery Discharging Problem |
Bill & Hugh:
You both identified your problem... One same problem.
The charging circuit is NOT working.
Why is it not working?
Well there you will have to pull out the VOM and start taking readings...
Voltage and Resistance.
1 - Start with removing and cleaning ALL connections in the circuit...
Battery, Voltage Regulator (VR), Circuit Breakers , etc.
2 - REPLACE all lock washers.
3 - CHARGE the battery off a battery charger to verify the battery is:
a> Good
b> Can hold a charge
c> Has power to excite the VR - No Excite No charge.
4 - If you have one of those solid magnetic alternators... SORRY! But check
for loose & broken magnetics.
For a battery to charge you NEED 13.8 to 14.2 VDC. Any less than that and
you will CONSTANTLY be draining from the battery until... YOU HAVE WHAT YOU
HAVE NOW!
Barry
Message 4
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| Subject: | Re: Rotax 912 Battery Discharging Problem |
Bill,
I had a similar problem a while back. It ended up being corrosion on the
regulator terminals. It wasn't obvious.
Try removing and cleaning the terminals. I used Scotchbrite and some
electrical terminal cleaner.
It worked
Dick Maddux
Milton,Fl
Message 5
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| Subject: | Re: Rotax 912 Charging Problem |
Hi Bill,
You could have a few things going on and each is easy to check. For different values
you should have the "Heavy Maint" manual and use section 74-00-00 on electrical.
You may have a bad ground on the battery, engine ground, a bad wire from the reg/rec
to the battery charge system. You may have a reg/rec going out. You can
test a few of these with the engine running and a multimeter. Check the AC current
going into the reg/rec, two bottom yellow wires. Check the "R" or reference
output just above those yellow wires and check the "C" or charge output at
the top of the reg/rec. That should be telling and should be 13.6V-14.0V. If you
have a plane that was always okay and then started to have a problem I would
look at all my grounds and reg/rec output. If you have a brand new plane I would
still look at those items, but I would make sure my wire was large enough
for the distances you have between the charging unit and instruments. Some people
have used too small a wire gauge in the past. Also make sure you do not have
the system drawing more current than the engine can deliver.
I would check my battery terminals for tightness first, then main ground wires
and then the reg/rec input and out put before anything else.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=334511#334511
Message 6
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| Subject: | Rotax 912 Battery Discharging Problem |
All good advice but I'd add one small point. Make sure to clean all the
connections, ground or hot, when replacing the lock washers.
One other thing to check is the case of the voltage regulator. Many solid
state regulators use the back of the case as a ground. This is a perfect
place for corrosion to occur and fool up your charging circuit. You may
want to remove the regulator from the firewall and clean both the back of
the regulator and the fire wall where it contacts the regulator before
reinstalling the regulator. If your regulator has a plug in type connector
make sure all the wires are solid in their crimps.
The fact that you did get some charging with the landing lights makes me
expect that the coils in your generator/alternator is ok but as Barry said
there are no guarantees. If a coil is open expect to spend money.
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of FLYaDIVE
Sent: March 20, 2011 9:23 AM
Subject: Re: RotaxEngines-List: Rotax 912 Battery Discharging Problem
Bill & Hugh:
You both identified your problem... One same problem.
The charging circuit is NOT working.
Why is it not working?
Well there you will have to pull out the VOM and start taking readings...
Voltage and Resistance.
1 - Start with removing and cleaning ALL connections in the circuit...
Battery, Voltage Regulator (VR), Circuit Breakers , etc.
2 - REPLACE all lock washers.
3 - CHARGE the battery off a battery charger to verify the battery is:
a> Good
b> Can hold a charge
c> Has power to excite the VR - No Excite No charge.
4 - If you have one of those solid magnetic alternators... SORRY! But check
for loose & broken magnetics.
For a battery to charge you NEED 13.8 to 14.2 VDC. Any less than that and
you will CONSTANTLY be draining from the battery until... YOU HAVE WHAT YOU
HAVE NOW!
Barry
On Sat, Mar 19, 2011 at 9:37 PM, bnelson79 <bnelson79@embarqmail.com> wrote:
<bnelson79@embarqmail.com>
I am having a similar problem to the one Hugh McKay had a few years ago. My
problem though is simply that the battery is not being charged. The
voltmeter show 12 volts at startup and slowly drains down from there (faster
if I turn accessories on). Noticed this while flying yesterday when the
voltmeter was pegged on the high end. Landed and suddenly started getting a
lot of static in headset. Turned off heater and static disappeared, but
voltmeter dropped to zero. Noticed landing light had been accidentally
turned on - turned off and volt needle swung to high side again. As I turned
switches off the needle would swing from high to low. Finally shut down. But
when I tried to restart volt meter read only around 9 volts and engine
wouldn't turn over at all. Recharged battery today and engine started with
12 volts showing and none of the other switching problems. But juice
continued to dribble away.
Any suggestions??? Bad ground??? Bad regulator???
Bill Nelson
Prosser, WA
N6576E
[quote="hgmckay"]
Quote:
I have a Rotax 912 UL engine on an Allegro 2000 LSA. Recently I have had to
replace my battery (12V 18Ah) because of it's inability to crank the engine.
Prior to replacing the battery I noticed my combination Volt/Amp meter
showed only 12 volts while flying. Usually the voltmeter shows about 13.5
volts at start-up while the engine is running on the ground and while
flying. After replacing the battery, and starting the engine the voltmeter
returned to 13.5 volts. However, when I began to close certain circuit
breakers engaging the front landing light, the two wing tip landing lights,
the two wing tip strobes, and the nav. lights I noticed the volt meter
dropping back each time I engaged one of the breakers until finally the volt
meter again was indicating only about 12 volts just as before. I have a "no
charge" red light in the battery charging circuit that comes on if the
battery is not being charged while the engine is running. This light
normally does not come on unless th!
e engine is at very low rpm ( aprx.1400 rpm). This is not normal for my
engine for my idle speed is set at 1800 rpm.
I do not know why the voltage is dropping each time I close the breaker for
lights described above, or what may be causing the voltage drop. I know I
have a good battery, but I don't know if my regulator is going bad, or if
there may be aground some where, or somthing else. Can anyone shed any light
on what may be causing this? The engine has only 255 hours on it and I have
not had any other problems with the engine. Any help would be greatly
appreciated.
Hugh G. McKay III
Allegro 2000
Rotax 912 UL
N661WW
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=334471#334471
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