English
Is175 Rev. 240102 - 2
Pag. 23
Component Description
STEPPER
MOTOR
The stepper motor has the function of modulating the flow of the alternative fuel taken in
by the engine. It maintains optimal values of carburetion in any operational condition.
To that end, the
“Leonardo” processes the THROTTLE POSITION SENSOR,
OXYGEN SENSOR, and RPM SIGNALS.
PROGRAMMABLE FUNCTIONS
OPTIONAL CONFIGURATIONS
ACTUATOR
Optional default lock
Default Value
0 ÷ 255 steps
Idle opening steps over default
25 (adjustment field 0 ÷ 255 steps)
Idle closing steps under default
25 (adjustment field 0 ÷ 255 steps)
Out - of - idle opening steps over default
40 (adjustment field 0 ÷ 255 steps)
Out - of - idle closing steps under default
40 (adjustment field 0 ÷ 255 steps)
Full throttle option
Actuator position in full throttle
0 ÷ 240 steps (to enable this option it is
necessary to enter a T.P.S. value at
which this option is engaged)
Full throttle T.P.S.
0 ÷ 4,9 Volt
CUT - OFF
Cut - Off Option
Lower RPM Cut - Off threshold
1300 ÷ 7000 RPM
Actuator position during Cut - Off
0 ÷ 255 steps
It is important that the + 12 V switched ignition power supply is connected where the
power is not timed, or is disabled during start - ups.
Verification procedure:
•
connect a digital multimeter and select the voltage range 20 V.
•
turn the ignition key on. The display on the multimeter must show 12 V.
•
wait a few seconds:
- if the voltage goes to 0 V it is timed. Try another power supply point;
- if the voltage remains steady at + 12 V, continue testing this power supply point;
•
start the engine while observing the multimeter. While the starter is cranking the engine,
make sure that the + 12 V power supply is steady, and that it does not go to 0 V while
cranking and back to + 12 V as soon as the engine is started:
- if the voltage goes to 0, try another power supply point;
- if the voltage remains steady at + 12 V, this is the appropriate power supply to
which the RED wire of the
“Leonardo” is to be connected.
We recommend using 7,5 A MAX. fuses.
+ 12 V
SWITCHED
IGNITION
RED WIRE
