Method and apparatus for multi-function electronic motor protect

Details Method and apparatus for multi-function electronic motor protect Method and apparatus for multi-function electronic motor protect

1998-03-10

1999-11-30

Sherry, Michael J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 28, 361 85, 361 936, 361 938, 361 97, 361 932, H02H 504

Patent

active

059953470

ABSTRACT:
A multi-function protection system (8) for protecting electrical equipment such as a screw compressor motor is shown having a housing (10, 20) mounting current sensing toroids (CT1, CT2, CT3) and associated circuitry as well as associated circuitry for temperature sensing PTC resistors (S1, S2, S3) adapted to be placed in heat conductive relation with respective windings of the motor. The circuitry is connected to an analog-to-digital converter or ADC (U6) which provides a binary coded input to a micro-controller (U5). The micro-controller performs protection sub-routines to control an output switch (Q4) which in turn controls the state of energization of a relay (K1) coupled to the screw compressor motor. The circuitry includes a current unbalance section (30a, 30b), an over temperature section (32), a low voltage cut-out circuit (33), a current transducer section (35), a signal conditioning circuit (36a, 36b, 36c), a micro-controller section (40) incorporating a shorted sensor protection system, current overload calibration section (41) and fault diagnostic section (42). A fault bank routine filters transient voltages resulting from industrial or environmental electromagnetic interference (EMI) for current overload, current imbalance and over temperature transient voltages to distinguish real fault conditions from EMI transients.

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patent: 4682101 (1987-07-01), Cattaneo
patent: 5179364 (1993-01-01), Marquardt
patent: 5179495 (1993-01-01), Zuzuly
patent: 5570258 (1996-10-01), Manning

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