Electrolux EWFLW65H - 27'' Front-Load Washer, Technical & Service Manual

Page: 12 / 92

B Ba as siic c IIn nffo orrm ma attiio on n
1-10
M Ma as ss s D Da am mp pe err O Op pe erra attiio on n
The mass damper is a simple assembly consisting
of a heavy mass supported by gel. This device
reduces cabinet vibration through the dissipation
of energy coming from “gel” deformation. The use
of the mass damper is effective for a wide range of
drum speeds and installation conditions.
D Drriiv ve e M Mo otto orr O Op pe erra attiio on n
The motor is an induction, three phase AC motor
that varies speeds when the voltage from the
speed control board varies in frequency and
amount. The motor has a tachogenerator that
inputs the speed of the motor to the speed control
board.
S Sp pe ee ed d C Co on nttrro oll
The speed control board is mounted to the base
plate of the washer in the left rear corner of the
washer. The speed control board controls the
following operations:
1. The speed of the drive motor is controlled by
converting input line to neutral single phase 60
Hertz voltage, to a varying frequency, three
phase output voltage from zero to 300 VAC.
By varying the amount, frequency, and polarity
of the voltage and comparing the input from
the tachogenerator on the drive motor, the
speed control board can operate the drive
motor at a preprogrammed speed and
direction.
2. The balance of the load in the washer is
monitored during the spin cycle by converting
the sine wave from the tachogenerator to
square waves and comparing the distance
between the square waves. If this distance
exceeds a specified parameter, the wash load
is determined to be unbalanced and the
washer responds accordingly.
Ma ss
Damping s upport (by gel)
Ma ss
Concrete
Mass Damper
M Ma as ss s D Da am mp pe err M Mo ou un ntte ed d o on n U Un niitt
M Ma as ss s D Da am mp pe err C Crro os ss s S Se ec cttiio on n