Van's Air Force
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- Thread starter dtw_rv6
- Start date
N363RV
Well Known Member
Double check the wire...
I installed my pmag back in early september. I had a little different problem... the RPM was reading incorrectly on my EIS 4000. (vintage 2002) I had to change the "Tach-PPR" setting to 2 in my case. It was set to 1. I have a lycoming O360.
I did this using the computer program EICAD. I didn't have to make any modifications to my EIS to get a signal.
Before you do anything.... please double check your wiring. Sometimes we just over look... simply believe that something is so when it isn't. In a nutshell make sure your wire has connectivity from one end to the other. Then make sure it didn't get shorted to ground for some odd reason. Look at the diagram and make sure you are hooked into the right(terminal #6) portion of the plug on the PMAG.
I installed my pmag back in early september. I had a little different problem... the RPM was reading incorrectly on my EIS 4000. (vintage 2002) I had to change the "Tach-PPR" setting to 2 in my case. It was set to 1. I have a lycoming O360.
I did this using the computer program EICAD. I didn't have to make any modifications to my EIS to get a signal.
Before you do anything.... please double check your wiring. Sometimes we just over look... simply believe that something is so when it isn't. In a nutshell make sure your wire has connectivity from one end to the other. Then make sure it didn't get shorted to ground for some odd reason. Look at the diagram and make sure you are hooked into the right(terminal #6) portion of the plug on the PMAG.
Last edited:
Isaac
Well Known Member
RE: EMag to EIS4000 Tach Reading
The E-mag manual says the tach output is a 12V signal and the output is 2 pulses per rev. The EIS will work fine with a 12V square wave input.
You might need to adjust the EIS "TachP/R" setting if your tach reading is off once you get it to display the tach input.
Did you removed the 27Kohm resistor that was in series between the magneto p-lead and the EIS tach input? If the resistor is still in place it could be affecting the amplitude of the tach signal.
I wasn't able to get my EIS to work with a 5V tach input. It read 0 RPM all the time. The new EIS units have a setting that changes the sensitivity of the EIS tach input so it will work with electronic ignition systems that provide a 0-5V pulse output.
The E-mag manual says the tach output is a 12V signal and the output is 2 pulses per rev. The EIS will work fine with a 12V square wave input.
You might need to adjust the EIS "TachP/R" setting if your tach reading is off once you get it to display the tach input.
Did you removed the 27Kohm resistor that was in series between the magneto p-lead and the EIS tach input? If the resistor is still in place it could be affecting the amplitude of the tach signal.
I wasn't able to get my EIS to work with a 5V tach input. It read 0 RPM all the time. The new EIS units have a setting that changes the sensitivity of the EIS tach input so it will work with electronic ignition systems that provide a 0-5V pulse output.
