SECTION 4. Using the Ground Support Unit (GSU)
Status
Description
WAIT ACC
Waiting for the acceleration to stop (nearing
STEADY
).
STEADY
Waiting for the RPM to stabilise (at idle or calibration speed).
CAL IDLE
The ECU tries to find the correct pump voltage for idle RPM.
CALIBRATE
The engine accelerates to calibration RPM and waits for the RPM to stabilise.
GO IDLE
The engine drops back to idle RPM.
PVOLT DELAY
Pump voltage increase was too high during auto calibration, delaying further accel-
eration.
TEMP DELAY
Exhaust temperature increase was too high during auto calibration, delaying further
acceleration.
Table 2: Additional engine statuses for engine setups with analogue (brushed) pumps displayed on the GSU.
4.4
Termination statuses
Table 4 contains all statuses with which a run can be terminated that are not related to the auto calibration (see
Section 5.4) needed only when using an analogue (brushed) fuel pump, which are found in Table 3 (also see
Section 5.4).
Status
Description
CALIBRATION FAIL-
URE
The RPM during auto calibration was more than 5,000 RPM off target.
FLAMEOUT DURING
CALIBRATION
Exhaust temperature went below 250
◦
C which indicates a flameout.
FELL BELOW MIN.
CAL. RPM
The RPM dropped below the acceptable limit during calibration.
MAX. CAL. VOLT.
EXCEEDED
The maximum fuel pump voltage allowed was exceeded without reaching the re-
quired RPM.
CALCULATED MAX.
PUMPVOLT. EXCEED
The calculated voltage needed for maximum RPM exceeds the maximum voltage
(see Section 5.4).
CAL. PLAUSI FAIL
dV MIN-CAL <0.2V
The voltage difference between idle and calibration speed is less than 0
.
2
V
, which
indicates an error during calibration.
CAL. PLAUSI FAIL
dV CAL-MAX <0.6V
The voltage difference between calibration and maximum speed is less than 0
.
6
V
,
which indicates an error during calibration.
Table 3: Run termination statuses related to the auto calibration displayed on the GSU.
If an error is encountered during auto calibration, the engine will go to status
SLOWDOWN
and power down.
4.5
Main menu
The main menu is accessed from the status screen by pressing the enter (
✓
) button on the GSU. It has five
regular sub menus and the expert menu, which is locked by default because it exposes many parameters which
are outside the scope of normal user adjustments should only be changed by a qualified person (see Section
4.5.6).
4.5.1
Run time settings
This sub menu contains settings that affect the engine at run time, see Table 5.
4.5.2
User adjustments
This menu contains adjustments the user needs to make at least once, and some of them at the beginning of
each session (e.g. the ambient temperature), see Table 6.
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