Matronics Email Lists :: View topic - Z-19 ECU wiring question

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

Z-19 ECU wiring question

Matronics Email Lists Forum Index -> AeroElectric-List

View previous topic :: View next topic

Author Message

mikefapex

Joined: 05 Jul 2007
Posts: 70
Location: Colorado

Posted: Thu Oct 25, 2007 11:19 am Post subject: Z-19 ECU wiring question

Hi,



I am installing a Z-19 system for my Suzuki 1.3L 4 stroke driven aircraft and have a question about recommendations for wiring these components in that style system. And use a Single Toggle Switch to turn them ON/OFF. Each of these components has their own power lead. I am using RotaryAviation's EC2 engine controller, and I have received these amperage figures for components:



A. EC2         -  .25 amp

B. Injectors  - about .75 amp each (exact load depends on rpm)

C. Coil         -  1.5 amp average but depends on RPM, could be as high as 9 amps per coil.



I want to dual power these from the Main Battery Bus and Engine Battery bus using a Perihelion Schotty Diode (max 60 amps load). 



Question 1: In trying to estimate the fuse sizes for the above loads I am unsure how to do so for the COILS. If I maximize the load size I could be at 36 amps. At the same time making them 1.5 x 4 = 6 amps worries me with a nuisance fuse blow.



Question 2: recommendations: 

A. total the load outcome from Question 1 and run power wire from a single fuse, in and out of the diode and into a switch. Then split the power lines into three on the other side of the switch, and at the components end?



B. fuse each component separately, route each power into the diode, then coming out of the diode split into three power wires. Connect to a TPST (triple pole single throw) switch for turning all of them ON/OFF, then continue into each component.



I've asked Rotaryaviation this question several days ago but they've not gotten back to me. I need to order wire for this endeavor, whichever way is the best, and would like to move forward.



Thank you for any suggestions and advice,



Mike

- 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

klehman(at)albedo.net
Guest

Posted: Fri Oct 26, 2007 7:20 pm Post subject: Z-19 ECU wiring question

Mike

I suspect the manufacturer will come up with a recommendation.

However my thinking would be 18 awg and 10 amps minimum for the 

injectors but in fact I ran 14awg and 15 amp fuse on my subaru which 

also powers the ecu and a couple of other minor things.



Don't know about your coils but you might want to measure what they 

really draw for a few seconds on 12 or 14 volts. My two DIS coils will 

draw about 7 amps each max steady so I also ran them with 14awg and a 15 

amp fuse even though the average current is much less. I believe the car 

had metric equivalent of almost 14awg and was also fused at 15 amps. I 

did not want to risk that the high current pulses might eventually 

weaken the fuse and I wanted minimal voltage drop. I'm sure that 16awg 

would have been fine as well. Another consideration was that if a driver 

shorts on I did not want the fuse to blow and also kill my second coil 

since two cylinders working is better than none...  At the time I wasn't 

sure it the engine would windmill long enough to turn on my second 

ignition but as it happens mine will windmill down to at least 40 knots. 

With 4 coils that will really draw 9 amps when on continuously, I would 

consider wiring them in pairs with a fuse for each pair.



Ken



mikef wrote:



 	  Quote: 	
		  



Hi,



I am installing a Z-19 system for my Suzuki 1.3L 4 stroke driven aircraft and have a question about recommendations for wiring these components in that style system. And use a Single Toggle Switch to turn them ON/OFF. Each of these components has their own power lead. I am using RotaryAviation's EC2 engine controller, and I have received these amperage figures for components:



A. EC2         -  .25 amp

B. Injectors  - about .75 amp each (exact load depends on rpm)

C. Coil         -  1.5 amp average but depends on RPM, could be as high as 9 amps per coil.



I want to dual power these from the Main Battery Bus and Engine Battery bus using a Perihelion Schotty Diode (max 60 amps load). 



Question 1: In trying to estimate the fuse sizes for the above loads I am unsure how to do so for the COILS. If I maximize the load size I could be at 36 amps. At the same time making them 1.5 x 4 = 6 amps worries me with a nuisance fuse blow.



Question 2: recommendations: 

A. total the load outcome from Question 1 and run power wire from a single fuse, in and out of the diode and into a switch. Then split the power lines into three on the other side of the switch, and at the components end?



B. fuse each component separately, route each power into the diode, then coming out of the diode split into three power wires. Connect to a TPST (triple pole single throw) switch for turning all of them ON/OFF, then continue into each component.



I've asked Rotaryaviation this question several days ago but they've not gotten back to me. I need to order wire for this endeavor, whichever way is the best, and would like to move forward.



Thank you for any suggestions and advice,



Mike

- 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

mikefapex

Joined: 05 Jul 2007
Posts: 70
Location: Colorado

Posted: Mon Oct 29, 2007 5:56 am Post subject: Re: Z-19 ECU wiring question

Ken,



That is all good advice, especially about separating the coil feeds. You are right, I can fly on 3 cylinders so that would be some measure of safety. I am still waiting for the mfg to get back to me but I am leaning towards having separate feeds for all three (ecu/coils/injectors). Yes, I need ALL of them to fly but their loads vary widely and it makes sense to fuse each on appropriately.



Thanks again,



Mike

- 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