Electricity: electrical systems and devices – Safety and protection of systems and devices – Motor protective condition responsive circuits
Patent
1975-12-05
1978-02-21
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Motor protective condition responsive circuits
361106, H02H 504
Patent
active
040756742
ABSTRACT:
The disclosure relates to a protection system for electric motors and the like wherein a plurality of condition responsive PTC impedances are utilized in a bridge circuit to sense predetermined changes in the condition being sensed and proceed to interrupt current flow to a motor or the like being protected. The protection circuit is capable of sensing short circuits or impedances below a predetermined minimum across the sensors to thereby provide an alarm condition also. On the occurrence of the alarm condition, a lockout circuit is energized to prevent application of power to the motor, etc. until after power has been removed from the entire electric circuit and then reapplied thereto. The protection circuit of the present disclosure is also capable of either automatic or manual reset. There is also provided a pop-up flag and remote overload light which can be operated upon sensing of an alarm condition. The pop-up flag is designed to remain in the alarm condition even after removal of the alarm condition and later proper operation when operation is in the manual reset mode.
REFERENCES:
patent: 3457460 (1969-07-01), Buiting et al.
patent: 3500074 (1970-03-01), Obenhaus
Obenhaus Robert E.
Squiers David J.
Haug John A.
McAndrews James P.
Moose Jr. Harry E.
Texas Instruments Incorporated
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