MSFD0703AE/9328AV (1 of 1)
ÈDESCRIPTION OF SINGLE MOTOR DRIVE TRAIN
ÊCylinder Speeds
Machines covered by this section have two cylinder speeds. Slowest to fastest, these are wash speed, and
extract speed.
Wash speed occurs during washing and rinsing bath steps. The cylinder reverses direction approximately twice
per minute as explained in “How the Machine Reverses” in this section. For efficient extraction, distribution of
goods occurs during the last thirty seconds of each wash and rinse step.
Extract speed is used to extract the maximum possible moisture from the goods before the formula ends.
ÊDrive Train Components and Operating Sequences
A microprocessor timer controller directs the machine through the required steps for each program. Control-
lers are fully described elsewhere. Major drive train components include one motor with two windings to generate
two speeds, a v-belt and a pulley.
ËHow the Machine Reverses
The wash/extract motor periodically stops and reverses direction during washing and rinsing. Machines are
equipped with three-phase motors. Two relays (CRWAC and CRWAA) operate to change the cylinder direction.
These relays are actuated so that only one operates at a time. CRWAC causes clockwise rotation, CRWAA causes
counterclockwise rotation. Rotation is selected by exchanging two of three phased leads to the low speed motor
winding. Relays CRWAC and CRWAA automatically swap leads through a switching process, thus changing rota-
tional direction. There is a brief dwell period (generally less than three seconds) during each change of direction.
The cylinder is stationary during this time.
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