Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1991-11-22
1994-01-25
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
Specific condition
340310A, 340310R, 340538, 340640, G08B 2100
Patent
active
052819566
ABSTRACT:
A control for a clothes dryer with an induction drive motor and an electric resistance heater element. A single sense winding is threaded through sensors monitoring drive motor current and heater current, generating an output voltage each time the alternating motor or heater current passes through a zero-crossing. The control monitors the ON/OFF condition of the heater and samples the lagging phase angle of the motor current, and provides an improved system of detecting when the clothes load is dry. The control provides a clothes cool-down period with controlled moisture regain as per the user dryness selection. Numerous heater related diagnostic conditions are monitored at the start of each cycle, or, throughout each cycle, including: heater ground fault detection; 208 or 240 VAC service voltage identification; heater open/short circuit detection; open door detection; heater box thermostat cycling; and restricted air flow detection.
REFERENCES:
patent: 3744046 (1973-07-01), Tamasi
patent: 4377804 (1983-03-01), Suzuki
patent: 4583086 (1986-04-01), Andrews et al.
patent: 4703306 (1987-10-01), Barritt
Crosland Donnie L.
Krefman Stephen D.
Lefkowitz Edward
Roth Thomas J.
Turcotte Thomas E.
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