With most of these tools, you select the sizes of the inverters that you plan to use and enter the loads and duty cycles that you expect.
有了这些工具，你可以选择变流器的尺寸，输入你想要的负荷和占空因数。
Duty cycles greater than 25% are generally needed only when additional work loads are encountered, such as valve modulation or in actuation of larger butterfly valves.
通常只有当遇到需要额外工作负载时，工作循环才会大于25%，如阀门处于节流状态或驱动大型蝶阀的应用场合。
For equipment subject to considerable dynamic loads (e. g. heavy-duty fans) the individual load rates of the equipment are specified (dead load, live load and dynamic loads).
对承受较大动荷载的设备(如大型风机)，其荷载应分项注明。(包括静荷载，活荷载和动荷载)。
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