Elevator – industrial lift truck – or stationary lift for vehicle – With monitoring – signalling – and indicating means – Monitors operational parameter
Patent
1997-03-03
1998-10-20
Nappi, Robert
Elevator, industrial lift truck, or stationary lift for vehicle
With monitoring, signalling, and indicating means
Monitors operational parameter
187409, 187292, B66B 134, B66B 704
Patent
active
058249761
ABSTRACT:
A fault sensor to be used with a controller as part of an active roller guide (ARG), the fault sensor disabling the ARG if it determines that any pair of current-force magnitudes for any of the ARG actuators is outside of a predetermined acceptable operating envelope, indicating an anomalous, or fault, condition. The ARG fault sensor receives, periodically, magnitudes of current and flux density for each actuator. From these, it calculates an actuator force and then checks that the current-force pair for each actuator is within the operating envelope. This envelope is curvilinear in its boundary. To check the curved segments of the envelope boundary, the fault sensor calculates the gap for each actuator. If each gap magnitude is within range, all that is left is to check the straight segments of the envelope boundary. This is done by simply checking that each actuator current and force magnitude is less than a predetermined limit.
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patent: 5617023 (1997-04-01), Skalski
patent: 5652414 (1997-07-01), Roberts et al.
patent: 5703424 (1997-12-01), Dorman
Jamieson Eric K.
Williams Daniel S.
Nappi Robert
Otis Elevator Company
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