Pumps – Condition responsive control of pump drive motor – Having timer or delay means
Patent
1993-07-21
1994-11-08
Bertsch, Richard A.
Pumps
Condition responsive control of pump drive motor
Having timer or delay means
417 18, 417 4411, 417 53, F04B 4902
Patent
active
053622065
ABSTRACT:
A pump-off controller checks for pump-off by examining the relative phase relationship between AC voltage and AC current supplied to an inductive, alternating current, electric motor driving a cyclically operated mechanical system having a walking beam for raising and lowering a subsurface pump by means of a string of sucker rods. When the phase angle between AC voltage supplied to the motor and AC current drawn by the motor exceeds a predetermined value at selected points or regions of the pumping stroke, the pumping system is shut down for a predetermined time.
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Montgomery Richard C.
Pippin Gerald W.
Westerman G. Wayne
Automation Associates
Bertsch Richard A.
Lisa Steven G.
Scheuermann David W.
Warner Peter C.
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