Service manual

43
has six terminals marked on the schematic as
A,B,C,D,E, and F that receive inputs or codes from
the control board. These inputs or codes program
the speed control board to run the drive motor at a
certain speed and for a preset length of time. When
the program is complete, the speed control board
sends a signal to the control board to advance to
the next increment.
3. The speed of the drive motor 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.
4. The balance of the load in the washer during the
spin cycle by converting the sine wave from the
tachogenerator to square waves and comparing the
distance between the square waves.
Motor
The motor is mounted to the bottom of the outer tub.
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.