Low RPM Reading
912ULS w/ GRT EIS 4000. Tach is reading lower than engine RPM. Normal take-off power. At a low cruise speed reading, tach reading 1200rpm low.
912ULS w/ GRT EIS 4000. Tach is reading lower than engine RPM. Normal take-off power. At a low cruise speed reading, tach reading 1200rpm low.
by Kevin Stewart » 2 years ago
You don't say whether this is a new fault or whether it has always been like this. Is it a new or existing installation?
I see that there is an addendum to the EIS manual for Rotax 912 connection, see here:
https://grtavionics.com/media/912-M2000-4000-Addendum.pdf
The troubleshooting guide also has these words of wisdom:
Rotax 912/914 : On about 1 engine in 10, the tach reading from the dedicated tach output will be erratic. This is
cured by reversing the two tach output wires from the engine, or installed a 10k Ohm resistor (1/4 W or larger)
inline in the tachometer lead.
https://grtavionics.com/media/Troubleshooting-Guide.pdf
by James Ott » 2 years ago
Many folks have had to install the resistor to cure erratic tach readings, sometimes after several hundred hours of trouble free use.
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