| 摘要 |
<p>An appliance programmer, in particular an automatic washer programmer, employs a memory circuit and a sequence control for establishing a predetermined program. Included in the programmer are a safety circuit and a water level sensing circuit whose function is to detect malfunction in the filling and draining operations of the appliance. Thus, when the machine has progressed to a washing operation during which the wash tub normally has a sufficient amount of water to perform the washing operation, the sensing circuit will sense a low water level condition and will reenergize the water fill valve solenoid to bring the water level up to the desired point. The programmer logic permits the safety circuit to reenergize the fill valve solenoid twice in response to low water level indications after which the logic will interrupt the program in response to a third low water level indication and will deenergize the appliance. In addition a service light is energized to call attention to the malfunction by the machine operator. Another portion of the safety circuit interrupts the program and deenergizes the machine function and energizes a service light when water is detected in the machine tub at the end of a draining operation.</p> |
