F - Mech Eng,Light,Heat,Weapons – 04 – B
Patent
F - Mech Eng,Light,Heat,Weapons
04
B
342/37
F04B 49/06 (2006.01) H02H 5/00 (2006.01) H02H 7/08 (2006.01)
Patent
CA 1172736
Motor Protection Control Circuit 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 de- energizes the control relay in response to sensed malfunctions. The motor protection device comprises a manual reset motor protector 40 having switch con- tacts 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 as- sembly. 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 energiza- tion of the tripping coil, the impedance of the trip- ping coil will reduce the voltage on the control re- lay below its seal-in value, thereby deenergizing the control relay.
409877
Hewitt D. Gary
Jones Thomas A.
Gorman-Rupp Company (the)
Ridout & Maybee Llp
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