From: "Finn Lassen finn.lassen@verizon.net" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: EC3 hardware notes
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Date: Thu, 25 Jun 2020 20:15:56 -0400
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Well, I dragged it outside and ran it today. (RX-8 Renesis, LS2 coils, 
Large secondary injectors)

Like night and day! Smooth as silk.

Ran it up to 5,800 RPM w/o prop.
Mounted my RV-3B prop and ran it up to about 3,800 RPM.
Don't know how I'm going to run it at higher RPMs until I get canopy 
back on, seats in and brakes connected. Too much wind from the prop.
So it may be a while until I can run it at full power while I finish up 
some fuselage items, put on the wings, etc.

Oh, the A controller chip does not have working inputs for Mode selector 
switch and Store/Primer switch. So I first ran it on B, thinking A 
wasn't working. But engine continued running when switching over to A.  
I'm amazed how weak the inputs on those chips are.  (Actually I borrowed 
them from Tracy -- used -- so may have been damaged in a less humid 
environment.)  Still, I have two otherwise brand new chips I can't 
reprogram. So either the Vpp input or the PGD output must be damaged.
In addition to taking precautions against static electricity when 
handling the chips, it probably would not be a bad idea to add static 
protection (for example 5.1V zeners to ground) on the 4 mode switch 
inputs, Store input, etc.
J2 pins 1, 7, 9, 10, 11, 16, 21, 22, 23 and 24 all go directly to the 
CPU chips. Some have 10K pull-up resistors, some a capacitor to ground, 
but all susceptible to damage by static electricity, a stray 12V wire, 
etc.  when not connected to the PCM (program and control module). Maybe 
I'm just too charged up :)

Finn

On 6/25/2020 6:27 PM, Stephen Izett stephen.izett@gmail.com wrote:
> Hi Finn
>
> When I went to the hangar yesterday, unfortunately I found that one of the solder lugs (not the joint, but the lug itself) on the EC2 to EC3 adapter db37 had broken off which is very disconcerting.
> It was one of the secondary injector feeds, so not responsible for the rough running. I now need to replace/resolder it with a new female db37. Very annoying!
> Doh! As I’m writing this, I just realised I still could have tested the code with one of the secondaries not connected.
> I’m busy with my kids and grandkids up from the farm this weekend so its not going to happen for another week at least.
>
> Steve Izett
>
>
>> On 25 Jun 2020, at 1:38 am, Finn Lassen finn.lassen@verizon.net <flyrotary@lancaironline.net> wrote:
>>
>> Cool. Probably won't beat you to it. Still working on the canopy bow. Fiberglass - yuk!
>>
>> Finn
>>
>> On 6/24/2020 8:37 AM, Stephen Izett stephen.izett@gmail.com wrote:
>>> Hi Finn
>>>
>>> Both A & B chips erased, verified blank, reprogrammed (EC3CL8.HEX 17/06/2020), verified and checked program and config memory.
>>> All looks right.
>>> So after flying tomorrow on the EC2, I’ll see about swapping in the EC3 and see if she runs!
>>> I’ll let you know how we go.
>>>
>>> Thanks Finn
>>>
>>> Steve
>>>
>>>> On 24 Jun 2020, at 7:52 pm, Stephen Izett stephen.izett@gmail.com <flyrotary@lancaironline.net> wrote:
>>>>
>>>> Hi Finn
>>>>
>>>> ok. Now I recall you mentioning this recently but misunderstood.
>>>> Sorry I haven’t read all your emails carefully enough having done the work with tracy.
>>>>
>>>> Good news for this EC3, that being the case.
>>>> I’ll see if I have enough time tonight to reprogram the chips as I’m headed down tomorrow and could test the new code.
>>>>
>>>> I tried to pick up some 2.7v zeners today, but they only had 3.3v in single units and 2.7v by the 1000!
>>>>
>>>> So the full wave clipping circuit you supplied should clip the CAS signal to Zener voltage + forward volt drop of the other zener.
>>>> 2.7+~0.7 = 3.4v. If I use the 3.3v it would clip the signal at 3.3+~0.7=4v. My analog amp knowledge is woefully lacking these days
>>>> but I thought this extra 0.6v would be fine for Tracy’s conditioning circuits.
>>>> Appreciate any analog insights you can offer re those signal conditioning amplifier/buffers?
>>>>
>>>> Cheers
>>>>
>>>> Steve Izett
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>> On 24 Jun 2020, at 6:27 pm, Finn Lassen finn.lassen@verizon.net <flyrotary@lancaironline.net> wrote:
>>>>>
>>>>> Steve,
>>>>>
>>>>> It will NOT run programmed for Renesis and LS2 coils unless you reprogram the chips using the source code I uploaded on the 17th of June:
>>>>>
>>>>> "Here it is:
>>>>> https://drive.google.com/drive/folders/1mVzPOxUwcGUlPizxnRF40nUyKBzfT4DC?usp=sharing
>>>>> It's EC3closedloop.zip."
>>>>>
>>>>> Finn
>>>>>
>>>>> On 6/23/2020 6:23 PM, Stephen Izett stephen.izett@gmail.com wrote:
>>>>>> Hi Finn
>>>>>>
>>>>>> Sorry, I misunderstood. Too many things on my mind at work at present.
>>>>>>
>>>>>> When I get to the EC3 mods I’ll:
>>>>>> a. Test the EC3 with new clamped CAS input. If no change and it still runs like a dog on two legs  -
>>>>>> b. I’ll reprogram the chips with your hex code and retest.
>>>>>>
>>>>>> On another note:
>>>>>> Still trying to decide on whether to pay to have my 4 blue secondary injectors cleaned and tested or
>>>>>> buy new injectors, New ones are cheaper on eBay but are they knock offs that I shouldn’t trust?
>>>>>> Cleaning is $40 each. New ones are $20 each!
>>>>>>
>>>>>> Cheers
>>>>>>
>>>>>> Steve Izett
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>> On 24 Jun 2020, at 12:04 am, Finn Lassen finn.lassen@verizon.net <flyrotary@lancaironline.net> wrote:
>>>>>>>
>>>>>>> Oh, you already reprogrammed them with the fixed code I uploaded?
>>>>>>>
>>>>>>> Finn
>>>>>>>
>>>>>>> On 6/23/2020 10:44 AM, Stephen Izett stephen.izett@gmail.com wrote:
>>>>>>>> Thanks Finn.
>>>>>>>>
>>>>>>>> I’ll add the 2 zeners to the EC3 and test it.
>>>>>>>> I thought the reprogramming of the chips was right.
>>>>>>>> MPLABS reported them to be good.
>>>>>>>>
>>>>>>>> Steve
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>> On 23 Jun 2020, at 9:56 pm, Finn Lassen finn.lassen@verizon.net <flyrotary@lancaironline.net> wrote:
>>>>>>>>>
>>>>>>>>> Attached is an excerpt of the EC3 CAS input conditioning circuit without added clamping circuit and with.
>>>>>>>>>
>>>>>>>>> Finn
>>>>>>>>>
>>>>>>>>> On 6/22/2020 10:02 PM, Stephen Izett stephen.izett@gmail.com wrote:
>>>>>>>>>> Thanks Finn. Did you previously give us a the circuit? Do you have a sketch of it?
>>>>>>>>>> I’ll mod the EC3 and see if that is the problem.
>>>>>>>>>>
>>>>>>>>>> Cheers
>>>>>>>>>>
>>>>>>>>>> Steve Izett
>>>>>>>>> <EC3 CAS input with clamp.pdf><EC3 CAS input.pdf>--
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