System for monitoring the operation of a cage moving in a...

Details System for monitoring the operation of a cage moving in a... System for monitoring the operation of a cage moving in a...

B - Operations, Transporting

66

B

364/34

B66B 17/30 (2006.01) B66B 1/34 (2006.01) B66B 5/04 (2006.01)

Patent

CA 2002409

A pulse encoder digitally derives a first value of speed at which the cage is moving at any given time. An analog device, such as a tachogenerator, derives the second value of the speed, in analog form, at which the cage is moving at the same time. The two speeds are compared in a comparator to determine the differences therebetween. If the difference exceeds a predetermined limit, an emergency stop is tripped to arrest the motion of the cage.

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