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Igniton Problem on Rotax 914 - Help

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darinh

Joined: 20 Apr 2006
Posts: 327
Location: Utah

Posted: Sun Jul 06, 2008 7:55 pm Post subject: Igniton Problem on Rotax 914 - Help

Her is my problem...I have an ACS 510 Keyed switch and Rotax 914 and have run the 18 gauge shielded wires from the ignition modules to the switch as per Rotax.  These are connected to terminal "L" and "R" and other connections are as per ACS.  When I start the engine and do a mag/ign. check, the engine quits when switched to the "R" position.  It runs fine on "L" and "Both".  The shielding is connected to the center ground terminal and then grounded at my ground buss.



Can someone tell me what is wrong or give me some ideas?  Could I have a bad ignition module (they are brand new).



Also, I know ACS had an AD on their starter solenoids and require a diode to be added.  I have lost the diode that came with my soleniod so can anyone tell me which diode will provide the spike protection (1N5400?) and which terminals it connects to.



I hope there is an easy answer to this problem as this is the last thing that is keeping my out of the sky.

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_________________
Darin Hawkes
Series 7
914 Turbo
Kaysville, Utah

nuckolls.bob(at)cox.net
Guest

Posted: Wed Jul 09, 2008 12:39 pm Post subject: Igniton Problem on Rotax 914 - Help

At 08:55 PM 7/6/2008 -0700, you wrote:

 	  Quote: 	
		  



Her is my problem...I have an ACS 510 Keyed switch and Rotax 914 and have 

run the 18 gauge shielded wires from the ignition modules to the switch as 

per Rotax.  These are connected to terminal "L" and "R" and other 

connections are as per ACS.  When I start the engine and do a mag/ign. 

check, the engine quits when switched to the "R" position.  It runs fine 

on "L" and "Both".  The shielding is connected to the center ground 

terminal and then grounded at my ground buss.



Can someone tell me what is wrong or give me some ideas?  Could I have a 

bad ignition module (they are brand new).


	


   This says the R side is either permanently grounded

   and NEVER works or perhaps the module is bad . . . but

   I'd sure check the wiring first.

 	  Quote: 	
		  Also, I know ACS had an AD on their starter solenoids and require a diode 

to be added.  I have lost the diode that came with my soleniod so can 

anyone tell me which diode will provide the spike protection (1N5400?) and 

which terminals it connects to.



I hope there is an easy answer to this problem as this is the last thing 

that is keeping my out of the sky.


	


http://www.aeroelectric.com/articles/spikecatcher.pdf



   Check out any of the Z-figures that show how coil suppression

   is applied to relays and contactors. In some cases, the suppression

   is built right into the contactor (such as the starter contactors

   I used to sell) but can always be added externally to the contactor.

   Note that for some starter contactors, one side of the contactor

   coil is electrically connected to the base of the contactor . . .

   so the diode's anode would go to ground, the cathode (banded end

   of diode) would go to the contactor coil terminal.



   Bob . . .

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