REG. CODE
1-5302-509
MODEL N°
50778
DATE OF ISSUE
10.06.99
REVISION
00
DATE
10.06.99
ENDORSED
COMPILER TECO/ATI
82
Operation of the ignition system for gasoline (petrol) or LPG fuelled engines
Note that to operate with LPG, the engine must be equipped with module 122.2193.114 and the relative wiring serial N°
2185.942, since this ignition system has been designed to operate when the engine is fuelled with either gasoline (petrol) or
LPG.
The location of the module connections determines the difference in the system (Gasoline or LPG), as in the following cases:
·
Engine fuelled with gasoline (petrol) alone: the wire of contact N° 2 on the module should be connected to the ignition key
switch in the 15-54 position while the wire of contact N° 3 must not be connected (consult the relative wiring diagram, see
157 on page 66).
·
Engine fuelled with LPG: the wire of contact N° 2 on the module should be connected to position 50 of the ignition switch (it
is normally connected to 50 of the starter motor), while contact N° 3 controls the relay, supplied along with the LPG
conversion kit, which allows the module to pilot the starter motor.
This relay is essential owing to the current value required by the starter motor (10 A with 30 A peaks); values not tolerated
by the module driver.
It is important for the module to handle the starter motor to prevent undesired explosions in the intake manifold. The starter
motor is activated when the ignition key is turned to the start position. If the engine starts, starter motor powering will be
automatically cut-off by the module when the engine speed exceeds 900 r/min. The voltage supplied to contact N° 3 is zero
even if contact N° 2 remains powered (the key is maintained in the start position).
If the key is released and the engine runs at a speed of less than 900 r/min (owing to difficult starting or because the ignition
key has been released too early), the module will no longer power the coils but will continue to power the starter motor,
allowing the engine to make a complete cycle without sparks on the plugs, this is to eliminate any abnormal combustion
that could cause explosions in the intake manifold.
The coil power supply will be cut-off if the speed drops below 600 r/min during engine operation (consult the relative wiring
diagram, see fig. 159 on page 68).
LPG fuelled ENGINE LGW 627
XV
