Electricity: electrical systems and devices – Safety and protection of systems and devices – Motor protective condition responsive circuits
Patent
1981-09-10
1983-10-18
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Motor protective condition responsive circuits
361 26, 318782, 318783, 307126, 417 1, 417 45, H02H 708
Patent
active
044109245
ABSTRACT:
A protection device and circuit for a fluid pump or the like including a motor control relay MS for actuating relay contacts MS-1, MS-2, MS-3 that control the communication of power to a drive motor 10a, and a manual reset motor protection device 24 that deenergizes the control relay in response to sensed malfunctions. The motor protection device comprises a manual reset motor protector 40 having switch contacts 42 connected in series with the motor control relay and a tripping coil 44 which, when energized, opens the switch contacts. A current shunt path 46 including serially connected pump assembly mounted sensors 48, 50, normally shunts current around the tripping coil and is interrupted in the event of a sensed malfunction, causing the energization of the tripping coil which opens the switch contacts and deenergizes the drive motor. The switch contacts must be manually reclosed to reactivate the pump assembly. The impedance of the tripping coil and the motor control relay are selected so that should the switch contacts fail to open in response to energization of the tripping coil, the impedance of the tripping coil will reduce the voltage on the control relay below its seal-in value, thereby deenergizing the control relay.
REFERENCES:
patent: 3136922 (1964-06-01), Hynd
patent: 3603806 (1971-09-01), Hitzke
patent: 3636426 (1972-01-01), Buiting
patent: 3686511 (1972-08-01), Pauly
patent: 3887849 (1975-06-01), Nagel
patent: 3995199 (1976-11-01), Pfarrer
Hewitt D. Gary
Jones Thomas A.
Salce Patrick R.
The Gorman-Rupp Company
LandOfFree
Motor protection control circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Motor protection control circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Motor protection control circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1292715