| 摘要 |
The invention relates to a method for controlling a cable scoop 2, which cable scoop 2 is raised and lowered partly by closing machinery comprising a closing drum and closing cables, which are wound up on to the drum, together with a closing motor 40 that drives the closing drum, and partly by lifting machinery comprising a lifting drum and lifting cables 16, which are wound up on to the drum, together with a lifting motor 38 that drives the lifting drum, the lifting motor 38 and the closing motor 40 being fed by frequency converters 42, 44. In the embodiment according to the invention the lifting and closing motors are controlled by separate frequency converters 42, 44, so that the lifting motor 38 is fed with a lower voltage Un than the closing motor 40 and so that the lifting motor is fed with a higher field frequency fn than the closing motor. <IMAGE>
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