英语小短文

A crane installation, especially a container crane, for moving a load, especially a container, includes a first stored-programmable control unit which, if required, receives signals resulting in a safety-related control command to one or several electric or electro-mechanical operational elements, and a second stored-programmable control unit which is configured in such a way that it can at least partially monitor the control operation of the first control unit on the basis of safety-related signals transmitted to the second control unit. If the safety-related control command of the first control unit is improper, the second control unit is able to issue its own control command to an operating element. Other References

Bartolini et al., Load swing damping in overhead cranes by sliding mode technique, 2000, IEEE, p. 1697-1702.
Belmans et al., Practical design considerations for braking problems in overhead crane drives, 1993, IEEE, p. 473-479.
Joshi et al., Position control of a flexible cable gantry crane: Theory and experiment, 1996, Internet, p. 2820-2824.
Suzuki et al., Semi-Aunomatic control of overhead crane using postential method, 2000, IEEE, p. 3224-3229.
Al-Lami et al., Microprocessor based crane load state monitoring system, 1991, Internet p. 1183-1186.
Sterle L A: “Considerations in Applying Programmable Controllers in Safety System Applications”, Advances in Instrumentation and Control, Instrument Society of America, Research Triangle Park, US, vol. 45, No. Part 3, 1990 pp. 1295-1304, XP000172075, ISSN: 1054-0032.
Ketteler H et al: “Smart' Security for Rotary Tower Cranes with ABB Procontic”, ABB Review, ABB Asea Brown Boveri, Zurich, CH, No. 3, 1995, pp. 25-30, XP000510176 ISSN: 1013-3119.