Matronics Email Lists :: View topic - rotax integrated alternator warning light

Matronics Email Lists
Web Forum Interface to the Matronics Email Lists

Get Email Distribution Too! FAQ Search Memberlist Usergroups Register

Profile Log in to check your private messages Log in

rotax integrated alternator warning light

Matronics Email Lists Forum Index -> Europa-List

View previous topic :: View next topic

Author Message

rowlandcarson(at)gmail.co
Guest

Posted: Mon Aug 13, 2012 12:30 pm Post subject: rotax integrated alternator warning light

I've been trying to find out the purpose of the alternator warning light in the Rotax engine circuit diagram. Originally I had assumed it would light up if the alternator died and stopped producing useful output. Then I thought - where, in that circumstance, would the warning light get its power from?



I can't find any description of its function in the Rotax engine manuals. Does anyone know what it's for and when one should expect it to light up?



in friendship



Rowland



| Rowland Carson          ... that's Rowland with a 'w' ...

| <rowlandcarson(at)gmail.com>            http://www.rowlandcarson.org.uk

| Skype, Twitter: rowland_carson      Facebook: Rowland Carson

| pictures: http://picasaweb.google.com/rowlandcarson

- The Matronics Europa-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Europa-List

BobD

Joined: 05 Jan 2016
Posts: 110
Location: Sheffield UK

Posted: Tue Jan 23, 2018 10:35 am Post subject: Re: rotax integrated alternator warning light

Roland, did you ever get an answer to this question ?



I have the standard Alternator Fail lamp wired in as shown in the manual. I have yet to see it lit. Should it perform in the same way as on a car, i.e. should it light when the master switch is turned on, then extinguish once the engine is running, and the Alternator producing power ? 

If not, how can I test it is working ?

- The Matronics Europa-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Europa-List

_________________
Bob Dawson
Europa XS TG || 912 ULS || G-NHRJ || Dynon Skyview || PilotAware || SmartAss3

dpark748(at)me.com
Guest

Posted: Tue Jan 23, 2018 11:24 am Post subject: rotax integrated alternator warning light

Yes with engine running and alternator switched on?



Dave Park

 	  Quote: 	
		   On 23 Jan 2018, at 18:35, BobD <rjd(at)bobdawson.plus.com> wrote:

 

 

 

 Roland, did you ever get an answer to this question ?

 

 I have the standard Alternator Fail lamp wired in as shown in the manual. I have yet to see it lit. Should it perform in the same way as on a car, i.e. should it light when the master switch is turned on, then extinguish once the engine is running, and the Alternator producing power ? 

 If not, how can I test it is working ?

 

 --------

 Bob Dawson

 XS TG || 912 ULS || G-NHRJ

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=477512#477512

- The Matronics Europa-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Europa-List

BobD

Joined: 05 Jan 2016
Posts: 110
Location: Sheffield UK

Posted: Wed Jan 24, 2018 4:05 pm Post subject: Re: rotax integrated alternator warning light

I discovered the warning light I have used is polarity sensitive, so when I swapped the wires, the light did indeed come on with the Master Switch. I'll take it on faith at the moment that it extinguishes once the engine is running, as I didn't start her up today.

- The Matronics Europa-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Europa-List

_________________
Bob Dawson
Europa XS TG || 912 ULS || G-NHRJ || Dynon Skyview || PilotAware || SmartAss3

budyerly(at)msn.com
Guest

Posted: Wed Jan 24, 2018 7:06 pm Post subject: rotax integrated alternator warning light

Bob, 

It is interesting that what was old is new again.   

In a 1998 discussion the voltage warning bulb is a grain of wheat bulb or 3W/12V standard incandescent bulb.  It should not be a LED in a Ducati Regulator. 

Note the older Rotax installation manuals.  The new 912 install manual is very poor in describing the electrical installation for some reason. The build manual Chapter 25 indicates the same to use a 3W bulb.   

  

Long answer Ducati Only: 

Battery voltage at B+ is supplied to the regulator and in the circuit the L or light is connected to the C or control (Bus Voltage) and is to be within .2 Volts of battery.  When the regulator C and R, and B+ are powered by the battery  the light is illuminated because the voltage output of the generator side(also the L) is at Zero volts (basically ground). 

  

When the engine is started the Alternator supplies AC voltage to the Regulator via GG and converts it to DC voltage.  As the voltage output rises, the L circuit is powered by the generated output of the Alternator and as the L and C voltage  near equal voltage, the lamp then goes out indicating the alternator is generating charging voltage. 

  

In the event the alternator stator fails L goes to ground  or less than battery voltage, the light illuminates, warning the pilot of the output failure as C voltage is greater than L voltage.  Unfortunately if the Regulator fails internally,  the light will not work leaving your first clue the regulator failed is a low voltage warning or dead battery. 

  

Hence the term idiot light. 

  

If you have a LED installed as the alternator warning light, you have a problem.  The LED takes 1.2 volts to energize and of course only works one way as you found out.  I have seen them work or not work as this is a temperamental  current  circuit.   

  

I won’t argue the point.  With a Ducati, just put in a grain of wheat bulb and be done with it.  Do not put in a circuit breaker or fuse in the warning light circuit as the 3Watt bulb is the circuit protection.  It will blow before the  wire will fry.  20 or 22 gauge wire is all that is needed to wire this circuit, as no fuse is really necessary. 

  

Should you decide on a Schicke GR6 voltage regulator, that solid state unit does require an LED and a .5 amp fuse in the warning circuit as it is a totally different design.  

  

The LAA requires a warning light, however in other parts of the world if one has a volt meter or low voltage warning system, a warning light is not required.  I am the department of redundant redundancy, I have an idiot light, low voltage  warning on the EFIS and a volt/amp meter.  Trouble shooting is a breeze. 

  

Regards, 

  

Bud Yerly 

Custom Flight Creations, Inc. 

  

Sent from  Mail for Windows 10 

  

  From: owner-europa-list-server(at)matronics.com <owner-europa-list-server(at)matronics.com> on behalf of BobD <rjd(at)bobdawson.plus.com>

 Sent: Wednesday, January 24, 2018 7:05:57 PM

 To: europa-list(at)matronics.com

 Subject: Re: rotax integrated alternator warning light  

 

 

  --> Europa-List message posted by: "BobD" <rjd(at)bobdawson.plus.com>

 

 I discovered the warning light I have used is polarity sensitive, so when I swapped the wires, the light did indeed come on with the Master Switch. I'll take it on faith at the moment that it extinguishes once the engine is running, as I didn't start her up  today.

 

 --------

 Bob Dawson

 XS TG || 912 ULS || G-NHRJ

 

 

 

 

 Read this topic online here:

 

 https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fforums.matronics.com%2Fviewtopic.php%3Fp%3D477554%23477554&data=02%7C01%7C%7Cb018da16059849c1e06c08d56387f03a%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636524357864141437&sdata=KEs5dQq1Fj6Q2ZzUbklKcshD8lQk3vy6hBdl3ozZxpw%3D&reserved=0

 

 

 

 

 

 

 ===========

 st Email Forum -

 ook.com/?url=http%3A%2F%2Fwww.matronics.com%2FNavigator%3FEuropa-List&data=02%7C01%7C%7Cb018da16059849c1e06c08d56387f03a%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636524357864141437&sdata=HqRl0WraM%2BHU4vI1Z4nE0iw0SSUHttqpqa5LFoiQrTk%3D&reserved=0"> https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.matronics.com%2FNavigator%3FEuropa-List&data=02%7C01%7C%7Cb018da16059849c1e06c08d56387f03a%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636524357864141437&sdata=HqRl0WraM%2BHU4vI1Z4nE0iw0SSUHttqpqa5LFoiQrTk%3D&reserved=0

 ===========

 p;   - MATRONICS WEB FORUMS -

 ook.com/?url=http%3A%2F%2Fforums.matronics.com&data=02%7C01%7C%7Cb018da16059849c1e06c08d56387f03a%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636524357864141437&sdata=IUO12J4q%2FzVTSmXyBfxChKBrrP5rB1bRwCIaoeLWYxU%3D&reserved=0"> https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fforums.matronics.com&data=02%7C01%7C%7Cb018da16059849c1e06c08d56387f03a%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636524357864141437&sdata=IUO12J4q%2FzVTSmXyBfxChKBrrP5rB1bRwCIaoeLWYxU%3D&reserved=0

 ===========

 p;  - NEW MATRONICS LIST WIKI -

 ook.com/?url=http%3A%2F%2Fwiki.matronics.com&data=02%7C01%7C%7Cb018da16059849c1e06c08d56387f03a%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636524357864141437&sdata=OWCdAu5qs5eZ2cMvAGhbSD4YmCUaDbyyiU4uMntMCGY%3D&reserved=0"> https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwiki.matronics.com&data=02%7C01%7C%7Cb018da16059849c1e06c08d56387f03a%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636524357864141437&sdata=OWCdAu5qs5eZ2cMvAGhbSD4YmCUaDbyyiU4uMntMCGY%3D&reserved=0

 ===========

 p; - List Contribution Web Site -

 p;                  -Matt Dralle, List Admin.

 ook.com/?url=http%3A%2F%2Fwww.matronics.com%2Fcontribution&data=02%7C01%7C%7Cb018da16059849c1e06c08d56387f03a%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636524357864141437&sdata=KGu0gj4zZnnrcKzXrl6FhV6OVVjgwSynhIy7msX9Qcs%3D&reserved=0"> https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.matronics.com%2Fcontribution&data=02%7C01%7C%7Cb018da16059849c1e06c08d56387f03a%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636524357864141437&sdata=KGu0gj4zZnnrcKzXrl6FhV6OVVjgwSynhIy7msX9Qcs%3D&reserved=0

 ===========

- The Matronics Europa-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Europa-List

Display posts from previous:

	Matronics Email Lists Forum Index -> Europa-List	All times are GMT - 8 Hours
Page 1 of 1

Jump to:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum