190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 30-187
30.4.32.4 RPM
The following sensors can be configured for the RPM 1 input on the GEA 24, or the RPM input on the
GSU 73:
• Electronic Ignition Tachometer Signal (1, 2, 3, or 4 pulses per revolution - Lycoming and
Continental electronic ignitions typically output 2 pulses/revolution for 4-cylinder engines and 3
pulses/revolution for 6-cylinder engines)
• Jabiru Alternator RPM (6 pulses per revolution)
• JPI 4208XX - Magneto Port RPM Sender (4- or 6- cylinder)
• Rotax Trigger Coil RPM
• UMA 1A3C Mechanical RPM Sender
• UMA T1A9 Magneto Port RPM Sender (4- or 6-cylinder)
• Custom Sensor
NOTE
External components are required when using the Rotax Trigger Coil configuration with
the GSU 73 (see Figure 28.3
).
NOTE
Magneto P-Lead is an option for RPM, as MOD Level 2 GEA 24 or any GEA 24B units
are capable of being connected to a magneto P-Lead. If interfacing to a magneto, a series
resistor must be included as shown in Figure 27-4
. Only a MOD Level 2 GEA 24 can be
connected to a P-Lead. Do not connect MOD Level 1 or MOD Level 0 units to a P-Lead.
The MOD Level status can be determined by checking the serial tag on the unit. If a P-
Lead is connected to a non-MOD Level 2 GEA, an “Engine Interface 1 configuration
error” System Message will be generated, and configuration status will be reported to be
in error in the system information menu.
NOTE
Surefly TACH2 Module can be used like a P-Lead input when a Surefly Ignition Module is
installed. Magneto P-Lead would be selected, and 1 pulse/rev is used for 4 cylinder
engines, while 1.5 pulse/rev is used for 6 cylinder engines.
Custom
: These options allows the installer to enter up to 8 points of frequency-to-RPM calibration, using
any RPM sensor that has a known frequency output. The custom RPM configurations accept frequency
values up to either 500 Hz or 1 kHz; the lower-frequency configuration is better suited to noisy RPM
signals. Custom RPM configurations also support engine speed that display in percent instead of RPM.
Refer to pin description in Section 25 for supported digital signal characteristics.
NOTE
The Sandia ST26 tach converter is required to support turbine engine RPM.
FADEC
: The GEA 24 can be configured to monitor RPM data from the following FADEC interfaces:
• Rotax (912iS/915iS/916iS)
• Lycoming (iE2)
• ULPower
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