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Hi Bob,
Your schematic for the 20B must be different than
mine for the EC2-A3 20B. My schematic shows and describes the relay as
supplying power to the secondaries when the relay is not energized (see
excerpt of manual attached.) In this case the relay is closed until
activated. It looks like we have to refer each to our own manual or
directly to Tracy, since systems that appear to have the same hardware may be
wired for different functionality that would be program revision
dependant. At least in my case, I can not make a direct replacement of the
electromechanical relay with the SSR style without a EC2 program
revision.
Joe
----- Original Message -----
Sent: Sunday, January 13, 2008 4:04 PM
Subject: [FlyRotary] Re: EC2
> The schematic that I have for the 20B mechanical staging relay shows
the
> same logic as the solid state relay. The relay is open until
activated,
> then voltage is applied to the secondaries (Point A).
Both relays have
> +12 V on one side of the sensing circuit (coil) and the
other side is
> connected to pin 35 on the EC2. A low on pin 35
should activate either
> relay.
>
> Bob's cable is wired with
the solid state relay and 7 diodes. I used
> the same Schotky diode
as specified for the series diodes for the
> clamping diode from the
secondary power to ground.
>
> Bob W.
>
>
> On
Sun, 13 Jan 2008 11:58:24 -0500
> "Joe Ewen" <Jewen@comporium.net> wrote:
>
>> I have an EC2-A3 20B, this is not the latest revision that
uses the MOSFET staging relay, rather the version that uses the electromagnetic
relay. When in injector test mode, I get firing pulses on all
injectors. In this EC2 configuration, the staging relay is closed when
there is no signal to the relay, so the secondary fire also. If you have
the version with the MOSFET SSR relay, I would suspect the signal line to the
relay works in the inverse with a corresponding change in the program logic from
active low to active high on the staging relay channel. Disconnecting the
signal line from the MOSFET SSR (Tracy's drawing, terminal 1, connection A) and
running a line from the terminal to ground should close the relay and the
secondaries should fire as well as the primaries.
>>
>> Joe
>> ----- Original Message -----
>> From: Mark Steitle
>> To: Rotary
motors in aircraft
>> Sent: Sunday, January 13, 2008 7:28
AM
>> Subject: [FlyRotary] Re: EC2
>>
>
>
>>
>> Bob,
>>
>> It is my understanding that the injector test mode
works on the 2-rotor models only, not the 3-rotor model.
Something to do with the injector staging relay used on the 3-rotor
units. If you hear the injectors click when you press the primer (store)
button, then I would conclude that they're good. Concerning the primaries,
you could connect one at a time and press the store button and listen to see if
it responds. Then repeat the process for the other two. I don't
think this works on the secondaries.
>>
>>
Mark
>>
>>
>>
>> On Jan 13,
2008 12:04 AM, <BMears9413@aol.com>
wrote:
>>
>> Ok guys...my turn for
help,
>> I hooked up a real battery tonight. no
smoke..no popped breakers...no blown fuses....EM2 lights right up and all temps
are displaying accurate, along with pressures. EM2 shows NOP on the RPM until I
power up the EC2, as it should. I tried the test mode of the injectors and the
coils. I can hear the injectors when I use the primer function, but I get
nothing on the continuous injection or the continuous coils. So mode 0 is
working for prime, but I get nothing on mode 1 and 9. Its late, Im tired, and I
havent checked anything with a test light yet. will start that tomorrow. All
grounds are hooked up and grounding. All plugs in tight on the EM2. EC2, and
control panel. Harness built by Bob White so I dont think anything is messed up
there. Am I overlooking anything simple ?????
>>
>> Bob
Mears
>> Supermarine Spitfire
>>
>>
>>
>>
>>
>>
----------------------------------------------------------------------------
>>
Start the year off right. Easy ways to stay in shape in the new year.
>>
>>
>
>
> --
> N93BD - Rotary
Powered BD-4 - http://www.bob-white.com
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