Design And Realization Of Protection System For Hoist Based On ARM

In order to guarantee the safe operation of the hoist, a protection system for the hoistbased on ARM9and Linux is designed. The complete developing process of the protectionsystem is discussed on details.The important function of the hoist is summarized, and the necessity of developingprotection system is clarified. By analyzing of the available back up protection system of thehoist, there are so many problems which need to be solved, such as difficult functionextension, inflexible human-machine interfaces, lack of remote monitoring and so on. On thisbasis, the protection system for the hoist based on ARM-Linux is designed. S3C2440is usedas the core processor of the protection system, which has the advantages of low power, highspeed process, and rich internal resources. Linux is used as the operation system, which hasthe advantages of supporting network communication, supporting kinds of hardware platform,easy portability, high modularization, easier development and so on. The protection systemhas many characteristics, such as multitask, strong real-time, easy expansion of functions,remote monitoring. There are many protection functions in this protection system, includingover-voltage protection, over-current protection, speed limit protection and over-windprotection. The over-voltage and over-current protection is implemented by ADC andconverter of current and voltage, and over-wind and speed limit protection is realized by hallrotational speed sensor. The human-machine interaction becomes more flexible because ofLCD, Touch screen and GUI, which also increases the production efficiency. GPRS that is themain part of the wireless transmission is used, with which the remote monitoring of hoists isrealized. Comparing with wired transmission, the wireless transmission is more convenient.The tested results show that the protection system can meet the requirements of the design,with which the hoist can operate safely.