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Rotax 912 Alternator Inciator.

 
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gfmjr_20(at)hotmail.com
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PostPosted: Sat Jan 07, 2006 1:17 pm    Post subject: Rotax 912 Alternator Inciator. Reply with quote


A question for those flying behind the Rotax 912. The documentation
suggests
the use of a 3 watt 12 volt indicator lamp to be tied across the L & C
terminals
of the regulator to indicate whether or not the charging circuit is working.
1) Can an LED be substituted for the suggested lamp? And if yes,
what terminal does the
plus lead of the LED get tie to.
Thanks
George May
601XL 912S
http://toolbar.msn.click-url.com/go/onm00200415ave/direct/01/


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thilo.kind(at)gmx.net
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PostPosted: Sat Jan 07, 2006 3:03 pm    Post subject: Rotax 912 Alternator Inciator. Reply with quote


Hi George,
yes, you can use the LED, if a proper resistor is used. I believe, the plus
goes to L, but you might want to check with a voltage meter.
Best regards
Thilo Kind


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mfothergill(at)sympatico.
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PostPosted: Sat Jan 07, 2006 7:00 pm    Post subject: Rotax 912 Alternator Inciator. Reply with quote


Hi:
My opinon. Forget the lamp. Install an ammeter and a voltmeter. Then you
will have a clue as to what is happening.
Mike
george may wrote:


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gfmjr_20(at)hotmail.com
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PostPosted: Sun Jan 08, 2006 9:59 am    Post subject: Rotax 912 Alternator Inciator. Reply with quote


"Forget the lamp. Install an ammeter and a voltmeter"
Mike--
I will have a voltmeter also, but there is nothing like lights and
buzzers to get your
attention.
George
Do not archive


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dxj(at)comcast.net
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PostPosted: Sun Jan 08, 2006 3:49 pm    Post subject: Rotax 912 Alternator Inciator. Reply with quote


I have both a volt meter and a Light Emitting Diode (LED) warning lamp on my
Zodiac. It's useful to have a low voltage light as a way of drawing your
attention to an in-flight problem, but I don't think it's a substitute for a
volt meter.
As best I understand, the C terminal is positive and the L terminal is
grounded (negative) only in a low voltage situation. Therefore the anode
(longer pin) of the LED should connect to the C terminal and the cathode
(shorter pin) should connect to the L terminal. If you are not sure, use a
hand held volt meter to determine the polarity between the two leads when
the master switch is on.
Never connect an LED directly to a battery or power supply! It will be
destroyed almost instantly because too much current will pass through and
burn it out. Most 5mm diameter round LED are designed to operate nominally
at 30 mA and 2 volts (except blue and high intensity which can be as high as
4.5 volts). You need to add a current limiting resister in series with the
LED to ensure that it won't burn out.
What size resistor? Electrical resistance (R) is equal to the voltage drop
(V) across the resistor divided by the current (I) that is flowing through
the resistor - thus R=V/I. Therefore, if you want a 10 volt drop (12 minus
2) with 30 mA of current ... 10/0.03 = a 333 Ohm resistor should do the job
for most LED. Check the LED specs to be sure of the resistor size using the
above formula.
Another attractive option is to purchase a flashing LED to grab your
attention. These are typically designed to connect directly to currents
between 9 and 12 V (resistor is built in) and they will flash about 3 times
per second.
Hope this helps.
George wrote:
Quote:
A question for those flying behind the Rotax 912. The documentation
Suggests the use of a 3 watt 12 volt indicator lamp to be tied across the
L & C terminals of the regulator to indicate whether or not the charging
circuit is working.
1) Can an LED be substituted for the suggested lamp? And if yes, what
terminal does the plus lead of the LED get tie to.


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craig(at)craigandjean.com
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PostPosted: Sun Jan 08, 2006 4:07 pm    Post subject: Rotax 912 Alternator Inciator. Reply with quote


An LED without a current limiting resistor is referred to as an NED (Noise
Emitting Diode) especially with higher voltages ;0}
-- Craig


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charlesd1(at)telkomsa.net
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PostPosted: Mon Jan 09, 2006 11:08 am    Post subject: Rotax 912 Alternator Inciator. Reply with quote


Hi all,
I may be wrong, but ....
in my experience, the 3W 12V lamp is to limit the field current to the
alternator. I don't think it would be wise to replace it with an LED.
cheers, Charles Davis


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max.johansson(at)nokia.co
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PostPosted: Mon Jan 09, 2006 12:24 pm    Post subject: Rotax 912 Alternator Inciator. Reply with quote


Charles
This might be true for older conventional generators,
but the Rotax generator is permanent magnet and does
not have a field current. But you are right, I found
that a auto bulb was a better indicator than a LED
during bench testing of a rectifier regulator. Perhaps
by loading the L line to +12V with a resistor connected
in parallell with a LED with its own separate serial
resistor might do the trick.
rgrds
Max


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webmaster(at)upac.ca
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PostPosted: Mon Jan 09, 2006 2:30 pm    Post subject: Rotax 912 Alternator Inciator. Reply with quote


Putting in resistor for an LED is absolutely required. There are no
filament bulbs in my panel at all, everything is LED on my 601HD.
I have then on every switch, this way I know at a visual glance if a
fuse has blown.
Trev Page
C-IDUS 601HD R912
On Jan 9, 2006, at 3:23 PM, <max.johansson(at)nokia.com>
<max.johansson(at)nokia.com> wrote:
Charles
This might be true for older conventional generators,
but the Rotax generator is permanent magnet and does
not have a field current. But you are right, I found
that a auto bulb was a better indicator than a LED
during bench testing of a rectifier regulator. Perhaps
by loading the L line to +12V with a resistor connected
in parallell with a LED with its own separate serial
resistor might do the trick.
rgrds
Max


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leogates(at)allvantage.co
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PostPosted: Tue Jan 10, 2006 7:22 am    Post subject: Rotax 912 Alternator Inciator. Reply with quote


The 3 W lamp is Optional. If none is connected, nothing is conneted to
the lamp circuit.
I have the regulator lamp output connected to a Radio Shack Relay. A
bright flashing red LED is connected to the normally closed relay
contacts, thru a dropping resistor. When starting the engine, the LED
starts flashing when Essential Power is turned on. When the engine
starts and there is output from the altinator, the LED goes off. The
LED is mounted on the panel, just above my throttle.
At 50 hours I had an altinator connection to the voltage regulator come
loose. I was in flight, on my way home from a short XC. The light got
my attention immediately and a quick glance at the ammeter verified no
charge. I was 15 mins. from home, so continued the flight.
Leo Gates
N601Z
Charles D wrote:
Hi all,
I may be wrong, but ....
in my experience, the 3W 12V lamp is to limit the field current to the
alternator. I don't think it would be wise to replace it with an LED.
cheers, Charles Davis


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dxj(at)comcast.net
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PostPosted: Tue Jan 10, 2006 8:36 am    Post subject: Rotax 912 Alternator Inciator. Reply with quote


One watt is one ampere of current flowing at one volt; therefore AMPS x
VOLTS = WATTS ... or .25A x 12V = 3W. If the bulb's secondary purpose is to
limit current between L and C terminals on the alternator, then we must not
exceed .25A when using an LED instead of a bulb.


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PostPosted: Tue Jan 10, 2006 8:38 am    Post subject: Rotax 912 Alternator Inciator. Reply with quote


I really like that idea! If the switch is on, but the light is not, check
the fuse.


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PostPosted: Wed Jan 11, 2006 11:10 am    Post subject: Rotax 912 Alternator Inciator. Reply with quote


Thanks to all that replied to my initial inquiry . Once again this list has
proven to
be a wealth of knowledge with ideas. I thought I had asked a simple
question but found many interesting replies and much help.
George May
601XL 912s
Do Not archive


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