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Current Black Previous White
4.8.3 Rotor Position Sensor
One of the inputs that the Motor Control Module needs in order to determine which switches to turn
on is the position of the rotor. The rotor position sensor (RPS) supplies this information.
The rotor position sensor (RPS) is a printed
circuit board that contains three Hall Sensors,
which detect the magnetic field of the individual
magnets in the rotor. The RPS provides this
information to the Motor Control Module. The
printed circuit board sits in a black plastic
housing encapsulated by resin to protect the
board. The only exposed area of the board is
the connector for the main harness. Only the
black RPS will work with the black rotor.
Note: The RPS is not interchangeable with
any previous phase or series of machine.
Testing the Rotor Position Sensor
To test the RPS use a RPS tester kit, part number 479413, this is powered by a 9V battery. To
test the RPS follow the detailed instructions which are enclosed with the tester. The tester has 3
LEDs, and the pattern of these LEDs will change as the magnetic field of the Rotor passes the hall
sensors.
Connect the RPS tester to the RPS harness. Slowly turn the basket and note the pattern of lights.
A valid pattern is a pass. A fail will indicate a failure of either the harness or the RPS. If a failed
pattern is showing, connect the RPS tester directly on to the RPS at the stator and retest.
A pass is when 1 or 2 LEDs are illuminated at a
time, 0 or 3 LEDs illuminated indicates fail. Any
flickering of the fail LED will indicate that the
RPS or rotor is faulty. A faulty rotor would give
a fail at certain points of rotation.
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