Thursday, 28 September 2017

Martin Richardson, water framework manager – drives & controls, ABB Limited, writes:
The individual efficiency for products such as electrical motors and variable speed drives is normally given at a fixed operating point. However, by their very nature, variable speed drive systems are changeable. So using the single nominal efficiency figure found in catalogues can be hugely misleading and will result in miscalculation of the system efficiency.

Furthermore, EN 50598-2 allows some flexibility with regard to how figures are calculated/measured and therefore are not always like for like.

Efficiency figures and published data must be put into context. Without context the data is not useful and has no meaning. We must understand the system and the context behind the values we are using before we can use them to make decisions.

To read something you can believe, visit ABB’s dedicated System Efficiency website.

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