Malfunction detector circuit for the use with a pump-off control

Details Malfunction detector circuit for the use with a pump-off control Malfunction detector circuit for the use with a pump-off control

1974-08-02

1976-01-06

Schaefer, Robert K.

Electricity: motive power systems

Automatic and/or with time-delay means

Plural, diverse conditions or with time-delay means

307125, H02H 708

Patent

active

039315592

ABSTRACT:
A malfunction detector circuit for use in conjunction with a pump-off control circuit which is periodically actuated by a timer and which monitors the current drawn by the drive motor of a liquid well pump. The malfunction circuit monitors the operation of the timer, pump-off control circuit, and drive motor of the well pump for detecting any abnormalities in operation and provides a signal if a malfunction occurs. The malfunction circuit is actuated by the pump-off circuit timer unless the pump-off circuit gains control of the driver motor and interlocks the malfunction output. A counter is provided to count a predetermined number of sequential failures before a malfunction is indicated. In addition, an excessive current measuring circuit detects malfunctions such as parted rods, split tubings, stuck valves and other abnormal situations.

REFERENCES:
patent: 3200392 (1965-08-01), Chumakov
patent: 3417290 (1968-12-01), Craddock
patent: 3509824 (1970-05-01), Schmidly
patent: 3763397 (1973-10-01), Yockers

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