Matronics Email Lists :: View topic - Starter engaged light, was Starter and contactor wiring

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

Starter engaged light, was Starter and contactor wiring

Matronics Email Lists Forum Index -> AeroElectric-List

View previous topic :: View next topic

Author Message

aerobubba(at)earthlink.ne
Guest

Posted: Fri Feb 05, 2010 8:08 am Post subject: Starter engaged light, was Starter and contactor wiring

Hi All-



It's been a while since I went down my decision tree on this topic, and I

might not recall all the details perfectly, but it seems to me that there

are a couple details of 'starter engaged' annunciation that might have been

overlooked.  First, it seems to me that the objective is to know whether

there is power on the starter or not, so tapping the fat wire between the

solenoid and  the motor would be in order.  This would then annunciate that

there was power to the starter motor itself.  It also has the advantage of

monitoring the spin down of the motor.  Should the pinion hang and the

motor remain engaged after the solenoid opens, the back emf can keep the

engaged light illuminated.  It might be especially zippy if one were to use

a bi-directional led for the indicator, such that one could perhaps have

amber indicate normal engagement and red to indicate run-on.  Including a

zener diode could clip the spin-down indication during normal operation

while still allowing the run-on indication to function, should that become

desirable. 



glen matejcek

aerobubba(at)earthlink.net

- The Matronics AeroElectric-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?AeroElectric-List

aerobubba(at)earthlink.ne
Guest

Posted: Sat Feb 06, 2010 5:07 am Post subject: Starter engaged light, was Starter and contactor wiring

Hi Bob-



 	  Quote: 	
		   If a starter WERE in a back-drive mode, the polarity

 of voltage would not reverse . . . hence the starter-stuck

 light would not change colors . . . only get much brighter.




	


Duh-  I need to stop pondering the digest pre-caffeine....    



There was an airframe lost a while back due to a stuck contactor and the

ensuing electrical fire, but that involved significantly different and more

robust hardware.



As ever, thanks for your help with the rectal-cranial inversion!



glen matejcek

aerobubba(at)earthlink.net

- The Matronics AeroElectric-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?AeroElectric-List

Display posts from previous:

	Matronics Email Lists Forum Index -> AeroElectric-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