Abstract
A fault-tolerant control system for multiple lift installations is proposed. The system has a modular structure. It is composed by a system controller and as many motor controllers as lifts. The motor controller supports transient failure recovery through software routines and watchdog timers. Each lift may be assigned to two motor controllers, thus taking advantage of the existence of similar components. The system controller has a redundant architecture and, among others things, governs the system reconfiguration in the case of a failure. The additional cost of true redundancy is less than 1% of the overall installation cost. Also, the main causes of failure are analysed as well as the suitability of the proposed architecture to recovery them.
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