Jabiru tachometer lighting coil alternatives
Posted: Mon May 01, 2023 10:24 pm
EIS 6000 sw ver 78 as per first screen at bootup. Aircraft built 2011.
Tach has been working just fine... and then I installed the Rotec alternator thus losing the Jabiru lighting coil dynamo.
I also installed the Rotec electronic ignition with a dedicated tach output that I connected to tach 1 and set P/R to 3 on EIS.
Apart from the mag check dropping tach when Mag 2 disabled (the electronic ignition), this seemed to work just fine.
Then the other day, when things got warm, tach went away to zero. The electronic ignition was still functioning as per mag check but just no tach output from EIS. Landing without a tach is a bit distracting so I am re-investigating alternatives. Note that inspection of wires and connections found no anomalies and the tach is again working. Intermittent problems are the worst...
1. The EIS documentation seems to suggest support for two tach signals, at least in the most recent version. How do you know if your EIS really does support the tach 2 input? Is it ALL in the software version or was there some hardware also required?
2. The EIS documentation also suggests connecting tach to magneto P-leads via a 27K ohm resistor. Has anybody tried this with Jabiru coils and found it to work? This solution does not seem to be working for me and I would love to know if it is me or something that is known to not work?
I would hate to have to throw more $$$ at this thing to add in another Hall sensor just for the tach...
Tach has been working just fine... and then I installed the Rotec alternator thus losing the Jabiru lighting coil dynamo.
I also installed the Rotec electronic ignition with a dedicated tach output that I connected to tach 1 and set P/R to 3 on EIS.
Apart from the mag check dropping tach when Mag 2 disabled (the electronic ignition), this seemed to work just fine.
Then the other day, when things got warm, tach went away to zero. The electronic ignition was still functioning as per mag check but just no tach output from EIS. Landing without a tach is a bit distracting so I am re-investigating alternatives. Note that inspection of wires and connections found no anomalies and the tach is again working. Intermittent problems are the worst...
1. The EIS documentation seems to suggest support for two tach signals, at least in the most recent version. How do you know if your EIS really does support the tach 2 input? Is it ALL in the software version or was there some hardware also required?
2. The EIS documentation also suggests connecting tach to magneto P-leads via a 27K ohm resistor. Has anybody tried this with Jabiru coils and found it to work? This solution does not seem to be working for me and I would love to know if it is me or something that is known to not work?
I would hate to have to throw more $$$ at this thing to add in another Hall sensor just for the tach...