Mailing List flyrotary@lancaironline.net Message #26953
From: Ed Anderson <eanderson@carolina.rr.com>
Subject: Re: [FlyRotary] Re: injector size stop. I had both injectors wired (as per schematic) to =20
Date: Fri, 14 Oct 2005 15:21:36 -0400
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
 
----- Original Message -----
Sent: Friday, October 14, 2005 3:08 PM
Subject: [FlyRotary] Re: injector size stop. I had both injectors wired (as per schematic) to =20


On Oct 14, 2005, at 2:58 PM, Ed Anderson wrote:

 
----- Original Message -----
Sent: Friday, October 14, 2005 2:45 PM
Subject: [FlyRotary] Re: injector size stop. I had both injectors wired (as per schematic) to =20


On Oct 14, 2005, at 2:41 PM, Ed Anderson wrote:

 
----- Original Message -----
Sent: Friday, October 14, 2005 2:32 PM
Subject: [FlyRotary] Re: injector size stop. I had both injectors wired (as per schematic) to =20


I think you were wise to split your injectors power like that, I did not do that and in hind sight wish I had for the reason you cited.
However, I don't see how adding a circuit breaker would do that.  Now, if you are leaving even 1 of the CB ON then the EC2 is receiving power even if the EC2 CB is pulled.  As long as either the primary or secondary injector has power on the line (either of your injector CB is pushed in) then the EC2 will get this voltage.   Tracy used to have an LED on the program button of the EC2 and it would light up when the EC2 controller had power - that is another way I found out about the sneak circuit.  If I turned on an injector toggle the EC2 program button LED would come on even though its power switch/CB was off.
 
So do you get the 6.5volts when both injector CB are pulled?
 
Ed
 

When I turn on the P.injector switch ON, the EM lights up and I get 6.5V Voltage reading and "Low Voltage" warning on the EM2 display.
Buly
 
  This happens even when the injector power  CB is pulled on the primary injectors??
 
Ed


I can not disable my CB. But I can pull the connector off?
Buly
 
Ok, so there is power to your primary injector switch since the CB is not pulled.  In that case, I suspect that your EM2 is sensing the "sneakcircuit" voltage from your EC2.  I can think of two things to try depending on how much trouble each is to do
 
1. Disconnect the primary CB from power
2. Disconnect the Ec2 from the EM2.
 
If easy to undo, I would disconnect the EM2 from the EC2 - that way it either shows that the source is or is not the EC2.
 
If the problem goes away when the two are disconnected then I am convinced its the sneak circuit of the Ec2 feeding the EM2.
If the problem does not go away then the only thing I can think of is a ground loop of some type - a bitch to try and deal with.
 
 
 
and see the results of each on the problem.
 
Ed

Ed, most likely it is a ground loop. Sneak voltage could not be 6.5V. It can not drive anything?
Buly
Quite possible, but don't discount the fact that the sneak circuit could provide a resistance path that would knock your normal 12VDC down to 6.5 Volts.  Since  A ground loop is sometimes such a hard problem, I would disconnect the ec2 from the em2 -just to confirm it before starting on that task.  But, that's just my view {:>)
Good Luck
 
Ed
 



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