Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1982-12-28
1985-03-19
Weldon, Ulysses
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318399, 318334, 318473, G05B 500
Patent
active
045061998
ABSTRACT:
Agricultural fan control system for controlling operation of fan in an agricultural installation including a thermostat temperature control, a manual constant speed adjustment temperature control, and an automatic variable fan speed with a minimum temperature setting. The control system is fully enclosed in a dustproof, waterproof box with a spring-loaded cover for use in a barn. The sensor unit can be remote from the control unit, and accounts for a seven-degree fahrenheit temperature rise on modulating setting from minimum to maximum c.f.m. Voltage curve of the electrical system is inverted and slower so that there is a slower fan speed increase on the first five degrees than on the last two degrees temperature-wise. The system includes a minimum setting allowing for a constant minimum air movement while including a manual setting for maintaining constant maximum air movement. The c.f.m. to heat requirements is adjusted accordingly between 45.degree.-110.degree. F. The system will handle one or more fan units operating on either 110 or 220 line voltage VAC.
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F. J. Hyde, Thermistors, London Iliffe Books, 1971, pp. 22-33.
Jaeger Hugh D.
Weldon Ulysses
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