Electricity: electrical systems and devices – Safety and protection of systems and devices – Motor protective condition responsive circuits
Patent
1997-12-17
1998-12-08
Gaffin, Jeffrey
Electricity: electrical systems and devices
Safety and protection of systems and devices
Motor protective condition responsive circuits
361 87, 361167, 361187, H02H 504
Patent
active
058479082
ABSTRACT:
A machine includes first and second electrically actuated components and a shutdown circuit electrically interconnected therewith. The shutdown circuit has a current sense relay element which is electrically connected to the first electrically actuated machine component. The current sense relay element includes a coil capable of generating a magnetic field in response to direct current flowing therethrough and a reed switch adjacent the coil which is movable between open and closed positions in response to the presence of the magnetic field. The reed switch is normally closed when the direct current flowing to the first electrically actuated machine component is at or above a predetermined level. The reed switch opens when the direct current flowing to the first electrically actuated machine component falls below the predetermined level. The shutdown circuit also includes a shutdown relay element electrically connected to the current sense relay element and the second electrically actuated machine component so that when the direct current flow falls below the predetermined level, the current sense relay element the shutdown relay element are opened and the first and second electrically actuated machine components are shutdown.
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Gaffin Jeffrey
Gnibus Michael M.
Ingersoll-Rand Company
Sherry Michael J.
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