Washing Machine Diagram / August 19, 2018 / Julieta Alley.
Old Washer Spin Enable Switches: A mercury type spin-stop lid or door safety switch was used on most automatic washer appliance models until very recently. This device is mounted by a bracket to the lid hinge. This position ensures proper operation of the appliance, which depends on mercury within the capsule to make or break the contact. When the appliance owner raises the lid during spin, the mercury in the switch capsule runs away from the switch contacts, and the timer circuit to the spin solenoid is broken.
Most appliance manufacturers have now found it advantageous to employ a small switch or micro-switch, to stop the spin action. An actuator protruding from the lid of the automatic washer causes the switch to open before the lid is raised 2 inches. Electrical, either type of spin-stop lid or door safety switch is usually connected to wires between the spin solenoid and the timer. In this way, when the operator raises the lid during spin, the switch opens and the timer circuit to the spin solenoid is broken. By keeping the actuator clean and free of debris, you can avoid unwanted appliance repair service calls.
The motor cannot be reversed instantly. It needs a brief pause between switching directions, or else it may get damaged. For this purpose, another spin direction control timer (IC2) is employed. It is realised with an IC 555. This timer gives an alternate ‘on’ and ‘off’ time duration of 10 seconds and 3 seconds, respectively. So after every l0 seconds of running (either in clockwise or anticlock-wise direction), the motor stops for a brief duration of 3 seconds. The values of R3 and R4 are calculated accordingly.
Bracket, you can access the internal spring which sets the sensitivity.For example, by using a very light spring (ie, one that provides just enough force to return the diaphragm to its un-triggered position when the. Pressure is removed), it's possible to get a switch to trigger at just 5cm of water (~0.5kPa or 0.08psi). The external adjustment would then typically give a range of about 5cm to 7.5cm of water, but of course, this will vary depending on the unit and the spring used. Put in a stiffer spring and the adjustment.