Arrangement and method for controlling frequency converter modules
First Claim
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1. An arrangement for controlling frequency converter modules of an electric drive, wherein the arrangement comprises:
- two or more control means;
two or more frequency converter modules;
two or more loads;
switching means for connecting the frequency converter modules to different loads of the arrangement, respectively;
selection means for selecting active control means;
first branching means and second branching means, the first branching means being configured to establish connections between each control means and one or more second branching means, and the second branching means being configured to establish connections between each frequency converter module and one or more first branching means in such a manner that the second branching means comprise at least one branching device arranged to establish a connection between a frequency converter module and two or more first branching means.
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Abstract
An arrangement for controlling frequency converter modules of an electric drive. In the arrangement, the frequency converter modules are arranged to control alternatively a first motor or several motors having less power than the first motor.
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Citations
24 Claims
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1. An arrangement for controlling frequency converter modules of an electric drive, wherein the arrangement comprises:
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two or more control means; two or more frequency converter modules; two or more loads; switching means for connecting the frequency converter modules to different loads of the arrangement, respectively; selection means for selecting active control means; first branching means and second branching means, the first branching means being configured to establish connections between each control means and one or more second branching means, and the second branching means being configured to establish connections between each frequency converter module and one or more first branching means in such a manner that the second branching means comprise at least one branching device arranged to establish a connection between a frequency converter module and two or more first branching means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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14. A method for controlling frequency converter modules in connection with an electric drive arrangement, the arrangement including two or more control means, two or more frequency converter modules, two or more loads, and one or more switching means for connecting the frequency converter modules to the different loads of the arrangement, wherein the method comprises the steps of:
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selecting active control means by which the frequency converter modules are controlled; selecting loads loading the frequency converter modules by means of the switching means; establishing a connection between each control means and one or more frequency converter modules for controlling the frequency converter modules by branching the connection from each control means to one or more connections and combining one or more afore-mentioned branched connection into one connection to the frequency converter module; and controlling the frequency converter modules loaded by the loads by means of the control means.
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Specification