 |
Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
|
| View previous topic :: View next topic |
| Author |
Message |
vshimsl(at)live.com
Guest
|
 Posted: Sat Jul 11, 2009 10:10 pm Post subject: Low RPM from Plasma II+ and P-lead to Dynon d-180 |
 |
|
I have the digital pulse information from my Lightspeed plasma II+ electronic ignition feeding one input to my Dynon D-180 and a magneto P-lead tap through 30 k resistor (per Dynon manual) to the other RPM input of my Dynon D-180.
Problem is that with the P-lead Pulse per revolution set to 1 C and the Plasm II+ Pulse / rev set to 2 C my Dynon reads 2 to 3 hundred rpm low at 900 rpm (verified by Tru-Tach) and 4 to 6 hundred low at the high end (2100 to 2700 rpm).
I removed the Dynon and using a square wave generator providing 12 volt pk-pk referenced to ground tested both inputs of the Dynon. It is right on. I also dropped the voltage down to as little as 8 Volts Pk-Pk and the Dynon remained accurate.
Suspecting that the Dynon averages both inputs C I tested each input by removing the other. Both the Plasma II+ and the P-lead were reading low rpm's compared to a tru-tac (which can be calibrated by aiming it at flourescent lighting...pretty slick).
By Resetting the pulse rate of the Dynon to 1.5 for the Plasma II+ C I get readings that are consistently 60 rpm low. The P-lead with the recommended Dynon resistance of 30K reads 2 to 300 low.
My temporary fix at the moment is to remove the P-lead input to the Dynon from the Magneto (Slick brand via aerosport) and keep the Plasma II+ input set to 1.5 pulses / rev even though the Lightspeed manual says it should be 2 pulses.
Has anyone else been down this road? If so would appreciate hearing the solution before I haul a scope to the airport.
Regards C
Vince_Himsl
RV8 N8432 Flying! (10 hours)
Lauren found her dream laptop. Find the PC that’s right for you. [quote][b]
| | - The Matronics RV8-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?RV8-List |
|
|
|
| Back to top |
|
 |
carl.froehlich(at)verizon
Guest
|
| Posted: Sun Jul 12, 2009 1:56 pm Post subject: Low RPM from Plasma II+ and P-lead to Dynon d-180 |
|
|
Back when I had Lightspeed II+ ignitions I ran into this problem trying to get the tach output from the ignition to work with the Grand Rapids EIS. It turns out the Lightspeed Tach pulse is the problem. It is too narrow and too low of an amplitude to work with many engine monitoring systems.
I tried talking to Klaus to find out what kind of signal the Lightspeed was putting out. The only response I got was “the units were tested before shipping and any problems you have are a result of your poor installation” or words to that effect. The good folks at Grand Rapids however worked with me to find a solution. By modifying the input to the EIS I was able to get the Lightspeed Tach signal to work (I had to replace one resistor with a lower value and remove one capacitor – 10 minutes max).
Recommend a call to Dynon. Tell them the issue and perhaps they can offer a mod as well.
Carl Froehlich (RV-8A 500 hrs)
RV-10 (fuselage)
From: owner-rv8-list-server(at)matronics.com [mailto:owner-rv8-list-server(at)matronics.com] On Behalf Of Vincent Himsl
Sent: Sunday, July 12, 2009 2:04 AM
To: RV8 Builder's Group
Subject: Low RPM from Plasma II+ and P-lead to Dynon d-180
I have the digital pulse information from my Lightspeed plasma II+ electronic ignition feeding one input to my Dynon D-180 and a magneto P-lead tap through 30 k resistor (per Dynon manual) to the other RPM input of my Dynon D-180.
Problem is that with the P-lead Pulse per revolution set to 1, and the Plasm II+ Pulse / rev set to 2, my Dynon reads 2 to 3 hundred rpm low at 900 rpm (verified by Tru-Tach) and 4 to 6 hundred low at the high end (2100 to 2700 rpm).
I removed the Dynon and using a square wave generator providing 12 volt pk-pk referenced to ground tested both inputs of the Dynon. It is right on. I also dropped the voltage down to as little as 8 Volts Pk-Pk and the Dynon remained accurate.
Suspecting that the Dynon averages both inputs, I tested each input by removing the other. Both the Plasma II+ and the P-lead were reading low rpm's compared to a tru-tac (which can be calibrated by aiming it at flourescent lighting...pretty slick).
By Resetting the pulse rate of the Dynon to 1.5 for the Plasma II+, I get readings that are consistently 60 rpm low. The P-lead with the recommended Dynon resistance of 30K reads 2 to 300 low.
My temporary fix at the moment is to remove the P-lead input to the Dynon from the Magneto (Slick brand via aerosport) and keep the Plasma II+ input set to 1.5 pulses / rev even though the Lightspeed manual says it should be 2 pulses.
Has anyone else been down this road? If so would appreciate hearing the solution before I haul a scope to the airport.
Regards,
Vince_Himsl
RV8 N8432 Flying! (10 hours)
Lauren found her dream laptop. Find the PC that’s right for you. | Quote: | | http://www.matronics.com/Navigator?RV8-List |
0123456789
[quote][b]
| | - The Matronics RV8-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?RV8-List |
|
|
|
| Back to top |
|
|
|
|
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
|
Powered by phpBB © 2001, 2005 phpBB Group
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
