Engine shut-down circuits, Rzt-s – Cub Cadet RZT-S Series User Manual
Page 76
RZT-S
70
Engine shut-down circuits
Engine shutdown circuits stop the engine by disabling
the ignition and removes power from the afterfire solenoid.
Key switch shut-down: See Figure 7.13.
The key switch turned to OFF connects the M (Module)
terminal and L to G (Ground).
•
Grounding the magneto primary windings pre-
vents the magneto from developing the mag-
netic field that it collapses to generate a spark.
This disables the ignition.
•
The L terminal is de-energized.
NOTE: On older electrical system, prior to 2008,
the afterfire solenoid was powered by the
alternator. In order to turn off the afterfire
solenoid, the L terminal was shorted to
ground inside the key switch. This drains the
current from the alternator, de-energizing
the solenoid. That function was left in place
so that the same key switch can be used,
but it is not needed. The RZT-S powers the
solenoid through the L terminal of the key
switch and not the alternator.
Seat switch and brake switch: See Figure 7.14.
The seat switch and brake switch work in series to
ground the magneto primary windings if the brakes are
released while the seat is vacant.
1.
The magneto (yellow wire) is connected to the NC
terminal of the brake switch.
1a.
When the brakes are applied, the plunger of
the brake switch is depressed, opening the
NC contacts within the switch.
1b.
When the brakes are released, the plunger on
the switch is extended, closing the NC con-
tacts within the switch. This completes part of
the ground path.
1c.
The seat switch is the next part of the ground
path. The yellow wire/white trace connects the
park brake switch to the seat switch.
2.
The seat switch is connected to the NC terminal of
the brake switch (yellow wire/white trace).
2a.
When the seat is occupied, the NC contacts
within the seat switch are open.
2b.
When the seat is vacant, the NC contacts
within the seat switch are closed. This com-
pletes the final leg of the ground path when
the brakes are not set, disabling the ignition.
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