Wednesday, 21 May 2014

Ian Allan, ABB's UK Business Unit Manager for Motors and Generators, writes: A typical motor appraisal should initially look at your installed motors to identify critical applications that are running either continuously or for more than 4,000 hours per annum. Your supplier’s engineers will want to know some basic information about these motors such as, how old are the installed motors, how efficient are they, how many hours a year they run and if they have been rewound. Other issues could include your spares holding for critical plant if you repair or rewind failed motors.

This stage will also give your supplier a clearer understanding of how the process is meant to operate, ensuring you get a properly dimensioned motor should a replacement be needed.

The actual appraisal should involve your supplier’s engineer visiting your facility to inspect the selected motors, get an understanding of the plant, the inventory of spare motors, energy and maintenance plans. It is fairly common to find that an old motor can be 1-5 percent lower in efficiency compared to a new premium efficiency type. Motors running continuously could achieve a typical payback of between 2-3 years by scrapping the motor prior to failure. Replacing it at the point of failure and the new motor cost can be recovered in less than twelve months.

The findings should be clearly presented, showing exactly where savings can be made. The data should include an estimation of present energy usage; whether the application would benefit from variable speed control; payback time following an investment in new motors; and carbon dioxide emission reductions.

Recommendations for action should conclude the report, highlighting applications that can save the most. Monthly savings should ideally be highlighted and it should include detailed recommendations for implementation.

Work with your motor supplier to identify appropriate motors and the change to IE3 should go off smoothly.

Contact the ABB Energy & Productivity Team to book your motors appraisal and take a strategic approach to the new efficiency standards.

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