| 摘要 |
An improved bridge crane electric motor control system is disclosed, wherein a computer, a programmable controller, is employed to not only control the application of electrical energy to the motors of a bridge crane but also to count and store the instances of overload and of use. The controller is operated in accordance with a computer program which is disclosed and information relating to use is accessible by maintenance workers who may read out the amount of use and abuse of the crane and its motors and take corrective steps. The system provides greater security against unauthorized modification in the field by the operators and employs fewer and more reliable parts than previous such systems.
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