Main Control Board; Motor Control Board - Mcb - Electrolux EFLS617SIW Technical & Service Manual

Electrical Characteristics

7.1.2 Main Control Board

The Main Control Board supplies the power supply voltage to the Motor control and User Interface (UI) Board
and all other electrical components.
The commands acquired by the User Interface Board (by turning the selector, selecting an option and so on)
are sent to the Main Control Board, which powers all the electrical components (Solenoid Valve, Drain Pump,
Heating Element Assembly, Door Lock, Motor Control Board and the Display Board).
1. It controls the level of water via the analog Pressure Sensor.
2. It controls and monitors the status of the door.
3. It controls the temperature of the wash water via NTC probe inserted in the heating element.
4. It controls the voltage and frequency of the power supply and ensures they are close to the rated ones.
5. It controls the flow of water through the Solenoid Valve.
7.1.3 Motor Control Board
Motor Control Board transforms the energy from single-phase to three-
phase, which can be modulated in breadth and frequency respectively
to adjust the power and number of revolutions of the motor.
It receives signals from the main control board and sends voltage to
the drive motor to spin the drive motor in the proper direction and at
the proper speed. The motor control board detects the speed of the
drive motor through a tachometer component. If the motor control is
Motor Control Board
not working properly, the drive motor might not spin at all or might spin
at the wrong speed.
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