SECTION 4. Using the Ground Support Unit (GSU)
3. Last run minimum and maximum values. On this screen, enter (
✓
) cycles between the different values:
Pump voltage
Temperature
RPM
Fail-safe information, e.g.
FS_COUNT: 0x
FS-TIME: 0s
In this example, the fail-safe program was never invoked, so the total time spent in the fail-safe program
is 0
s
.
4. Battery status. Shows the battery voltage and a visual indicator. The values used for determining the
battery status can be configured in the main menu (see Section 4.5).
5. Fuel status. Shows the fuel level with a visual indicator.
WARNING
There is no way to accurately measure the fuel level, so it is calculated from some predefined
values (e.g. fuel flow at idle speed, fuel flow at full speed) and some user supplied values (the fuel
tank size).
These values can be configured in the main menu (see Section 4.5).
4.3
Engine statuses
Table 1 contains all engine statuses the GSU can display. Most statuses are related to the various stages of
the autostart process (see Section 5.3) and are given in the order they are displayed during a successful startup
procedure.
Status
Description
OFF
Engine is is off, can be switched to
standby
by moving the throttle first to
neutral
and then to
full
(see Section 5.2.2).
STANDBY
Engine is ready to receive the start sequence: Move the throttle from
full
position to
off
position. If the throttle is then set to
full
position within three seconds, the ECU
will initiate the
autostart
sequence (see Section 5.2.2).
PROP IGNIT
Engine ignition using auxiliary gas. Not relevant for AeroDesignWorks engines.
BURNER ON
Burner is on for the engine start using fuel.
FUELIGNIT
Ignition sequence for engine start using fuel.
FUELHEAT
After fuel ignition, the engine will heat up using constant RPM and pump voltage.
RAMP DELAY
The starter will increase its RPM, but the fuel flow will be kept constant.
RAMP UP
The engine will increase its RPM to idle speed by increasing the pump voltage and
thus the fuel flow.
AUTO
Engine is operating in automatic mode.
SLOWDOWN
Engine is turning off, waiting for RPM to go to 0.
COOLDOWN
Engine is turned off, cooling down with constant RPM from the starter after reach-
ing 0 RPM briefly.
Table 1: Engine statuses displayed on the GSU.
As engines using an analogue (brushed) fuel pump need an additional auto calibration phase, they have
additional engine statuses (see Table 2).
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