Textron Jacobsen InCommand PGM 22 - Circuit Operation; Ignition Circuit

4-8 4157082 First Edition
ELECTRICAL
4
Circuit Operation
Ignition Circuit
Operation
See Figure 4-4.
Figure 4-4: Ignition Circuit—Run Position
A magnet is mounted on the flywheel. When the flywheel
turns, the magnet passes by the ignition coil (T1). The
moving magnetic field provided by the magnet induces
voltage in the primary windings in the ignition coil. The
secondary windings provide high voltage to spark plug
(E1) by stepping up the voltage that is generated in the
primary windings.
When the E-stop switch (S1) or the engine on/off switch
(S2) is in the OFF position, the primary windings in the
ignition coil are grounded. With the primary windings
grounded, voltage induced in windings is shorted to
ground and the ignition coil does not produce high
voltage. Without high voltage at spark plug (E1), the
engine cannot operate.
E1
Spark
Plug
T1
Ignition
Coil
GryRedRed
S2
Engine
On
Off
S1
E-Stop
Switch
On
Off
RedBlk
X1
X2 X3
X4 X5
Blk
On/Off
Switch
Splice 1
X6