190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 30-200
30.4.32.14 Voltage
The GEA 24 and GSU 73 have provisions to monitor bus voltage from two different sources. Bus voltage
can be connected to the physical input pins, measured internally by the LRU, or communicated from
another data source.
Voltage Inputs
: The VOLTS 1 and VOLTS 2 input pins on the GEA 24 and GSU 73 can be configured to
monitor a directly connected bus voltage. VOLTS 1 can be configured either as "Bus 1" or "Main Bus", or
set to “Custom Volts 1”, which allows the installer to define the displayed gauge name. VOLTS 2 can be
configured either as "Bus 2", "Aux Bus", “Essential Bus”, “Backup Battery” or “Custom Volts 2”, which
allows the installer to define the displayed gauge name. The only difference is the text labels used to
display the voltage gauges in the EIS display and Engine Page.
EIS Power Input
: Instead of monitoring a voltage on a physical input pin, the GEA 24 and GSU 73 can
monitor the voltage applied to their AIRCRAFT POWER pins. Configure the VOLTS 1 input to "EIS
Power Input 1 Volts" to monitor AIRCRAFT POWER 1, and configure the VOLTS 2 input to "EIS Power
Input 2 Volts" to monitor AIRCRAFT POWER 2 input of the GEA 24. Bus1, Main Bus, or Custom can be
chosen as the gauge label for the EIS Power Input 1 selection. Bus 2, Aux Bus, Essential Bus, Backup
Battery and custom can be chose as the gauge label for the EIS Power Input 2 Selection.
Vertical Power
: Vertical Power inputs are configured from the Vertical Power Tab within the Engine &
Airframe configuration menu. See Section 30.4.32.36
Vertical Power VP-X for more information.
FADEC
: The GEA 24 can be configured to monitor ECU bus voltage from the following FADEC
interfaces:
• Rotax (912iS/915iS/916iS – both Lane A and Lane B can be selected on Volts 1/2 respectively)
• ULPower
• Lycoming
Additional bus voltages (more than 2 buses) may be monitored using custom configuration and calibration
of general purpose (GP) inputs, by setting the GP input to “Custom Analog (Volts)”. See
Section 30.4.32.25
for further information.
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