engine running the fadec will adjust the rotor speed accordingly the throttle position in a
closed loop system.
STOP speed
: Set the minimum RPM that the engine is allowed to run. The FADEC will
shutdown the engine if the rotor speed is below this setting.
Start/Min temperature
: Set the minimum
temperature that the engine is allowed to run, and
in manual start operation, sets the temperature
from witch the pump begin to run.
Maximum temperature
: Set the maximum
temperature that the engine is allowed to run. The
FADEC will reduce the acceleration rate if the EGT
approaches to maximum and will reduce the pump power if necessary to keep the
temperature below the maximum, but it don’t will cut the engine if the temperature is too
high, it will try always to keep the engine running by reducing the fuel flow .
Acceleration delay
: Set the acceleration time on
the engine. Higher values mean longer acceleration
times. The real acceleration time is calculated
using a complex algorithm that take in to account this value, temperature, current RPM,
commanded RPM, and the tendency of EGT and RPM.
Deceleration delay
: Similar to the acceleration,
but used during throttle down. Higher values mean
slower deceleration.
Stability delay
: When the engine is running at
constant throttle setting, the FADEC is adjusting
continuously the pump power so that the rotor RPM
mach exactly with the throttle signal. The speed of witch the fadec adjust the pump
power is set by this parameter. A value of 100 usually is the best for all engines. A too low
value can cause instability on the RPM.
P
ump Limit
: The Fadec can give to the pump the full
battery voltage, but in most cases the voltage
needed for the pump is only a fraction of the full
battery voltage. Limiting the pump give a much smoother control of the engine and
prevents that the pump could receive excessive voltage in the case of a problem in the fuel
circuit, a clogged filter for example. This excessive power will cause a high pressure on
the circuit that can cause leaks or blown tubes.
Modifying this parameter is similar to reducing the battery voltage, so the accel and decel
times will be modified. The recommended adjust of this setting is to set it to 1020 (no
limit), run the engine, check and annotate the Pw of the pump displayed on the first screen
when the engine is running at full power and then use this value as pump limit, increasing it
in a 10%-20% to give a bit of margin for weak batteries and pump wear. Once the new
value set, adjust the accel and decel delays for best engine handling.
