Two red cubes for D180

[Ricardo 103]

I have two F60 Red cubes on the fuel trail of an Edge Efi. Do they need to be connected to a differential module prior to connection to the D180? Rotax 912S

 

[maartenversteeg]

No, see the Dynon installation manual, these red cubes count the fuel flow in pulses per second and will both need to be connected to the Dynon

 

[Ricardo 103]

Thanks for the reply, but how? There is only one signal input on the 180 for fuel flow

 

[maartenversteeg]

The Dynon 800 & 1000 displays supports a fuel system where fuel run back into a talk using two red-cubes. If the 180 doesn't support a differential fuel measurements (I am not familiar) then you are out of luck the red-cubes just output a digital signal where the number of reported pulses is an indication for the fuel flow. You would have to measure the number of pulses in red-bus in a period of time and subtract the number pulses that the return flow red-cube reports (assuming both have exactly the same calibration factor), this can't be achieved by just connecting the outputs of the two red-cubes (unless you add more complex electronics that can calculate such a difference).

 

[Ricardo 103]

Thanks for your reply, looks like I need to look further as the 180 can’t calculate the differential and I think an intermediary is required such as an FFDM-1, but they‘re expensive