2.
When "Ready" is displayed, the user should cycle the stick to full power and back
to idle.
3.
When the stick is at idle again, the start sequence begins.
4.
The glow-plug is powered and checked. Once hot, the starter is engaged at
reduced power (soft start) and the gas valve is energized. If the glow test fail, a
"Glow Bad" message is displayed, and if the starter fails to have the rotor turning
a minimum RPM in 2 seconds, a “start bad” message is issued, and the autostart
function aborted.
5.
When the rotor arrives at more than the "ignition max rpm" programmed
parameter (default 4000), the starter is disconnected and the brake applied.
6.
When the rotor RPM fall below than the "ignition min. Rpm" parameter (default
2000), the starter is switched on again to raise the rotor speed to the "ignition
max rpm" and the cycle is repeated until the gas ignites or the system times out
after 30s.
7.
When the thermocouple register a increase of 50ºC in temperature meaning that
the ignition have occurred, the starter is switched on immediately at reduced
power, increasing his power accordingly to the real rotor rpm. At the same time
the pump is switched on at “pump start point” power, and the fuel valve is opened.
8.
The engine begins to accelerate as soon as the fuel begins to burn, and the power
of the pump is being increased trough the time at the "fuel ramp" slope. Once the
rotor RPM arrive to the RPM set in “rpm switch off gas” parameter (usually set at
3/4 of the “starter off RPM”) the gas valve is closed, and when the RPM arrive at
the predefined "starter off RPM" value, the starter is switched off and the brake
applied to it. The engine continues accelerating alone until the idle RPM are
reached.
9.
The user can finish the sequence in any moment, simply setting the trim to "off"
position. If the engine was on "running" phase (above idle rpm), a cooling sequence
will be triggered, cycling the starter motor until the EGT is below the minimum
programmed temperature. This cooling sequence will be aborted if the trim is
raised again.
10.
If the engine is hot (EGT higher than the minimum temperature) at the moment
that the user triggers the autostart cycle, then the FADEC will begin a cooling
cycle until the temperature is below the minimum programmed temperature. At
this moment it will continue with the normal autostart cycle if the trim is left in up
position.
Parameters used in “Autostart GAS” mode:
P
ump Start point
: Same use as in “manual start”
P
ump Start ramp
: Same use as in “manual start”
Glow plug power
: Adjust the glow plug brightness, it
should be adjusted depending on the plug type, Usual
values are between 1,5 and 2V.
Start GAS adjust
: The Fadec can cycle the solenoid
valve to adjust the starting gas flow. 100% mean that
the valve is all the time open, 50% half time open/half
time closed, etc.
