Safety switch and method of checked redundancy

Details Safety switch and method of checked redundancy Safety switch and method of checked redundancy

2006-08-21

2008-08-05

Deuble, Mark A (Department: 3651)

Conveyors: power-driven

Conveyor or accessory therefor specialized to convey people

With means to control the operation of the section

Reexamination Certificate

active

07407048

ABSTRACT:
An apparatus and method of disabling a drive system of a passenger conveying system is provided. The passenger conveying system is monitored with switches each arranged to detect a respective malfunction of the passenger conveying system. A shutdown signal is produced by a respective one of the switches detecting the respective malfunction and is coupled to a corresponding shutdown contact and to a controller. The corresponding shutdown contact operates to interrupt a drive enabling signal of the drive system in response to receipt of the shutdown signal. The controller monitors the shutdown signals from the switches and the drive enabling signal. The controller sends a signal to open a redundant contact to interrupt the drive enabling signal if the shutdown signal is detected and the drive system remains enabled.

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