Motors and Drives
application, EN50598-2 will help OEMs and industrial users to get better operational efficiencies in complete systems, not just individual components. However, if at this point you are a bit confused by
the new standard and the IE classifications it includes, don’t worry: you are not alone. The standard is not entirely easy to understand but this article will help explain it and also describe how ABB’s expertise can help gain clear and valid comparisons of total efficiency.
The short explanation of EN50598-2
The EN50598-2 standard defines new IE classes for the complete drive module (CDM) and new IES classes for the power drive system (PDS). It applies to motors and drives with a voltage range of 100 to 1000V, and a power range up to 1000kW. As you may know, direct-on-line (DOL) motors that
are connected directly to the electrical supply without any drive have had IE classifications of IE0, IE1, IE2, IE3 and IE4 for several years. The higher the number, the better the efficiency is. The new EN50598 standard introduces the new
term CDM (for complete drive module), which is in practice the same as the old term VSD (variable speed drive). CDM now has IE classes IE0, IE1 and IE2 but, it is important to note, these IE classes are defined differently from those for DOL motors. The new EN50598 also for the first time defines the
term PDS (power drive system), which equals the total system efficiency even accounting for losses. So the PDS is the motor + VSD combination and is rated with new IES classes IES0, IES1 and IES2 where the S stands for system.
Like a pump curve for the system
Generally, industrial process operators already know the conditions and the operational points at which they are running. Equipped with this process knowledge, and better data for combined drive-motor power efficiency that the new standard will produce, it is easier to evaluate efficiency and power losses. For example in a pumping application, by knowing the operating ranges, engineers can more accurately calculate losses in the entire motor-drive-pump system. This is somewhat analogous to a pump curve where a specific piece of equipment’s performance is well defined, except that it is now combined motor-drive-pump data. This offers a much more accurate indication of what the efficiency of the system will be, instead of using assumptions of how the various components will interact. Now customers will have this data clearly documented under standard EN50598-2. This will support both OEMs and industrial operations for their classification and reporting requirements. It will also help in prioritising where energy-saving investments should go, to improve ROI of the operation. Since ABB
Motor efficiency classes (IE) under standard EN60034-30-1 are based on efficiency (%) and measured at 100% speed and 100% torque.
Today’s intelligent VSDs play a critical role in these systems by monitoring, optimising and reporting on energy consumption and making sure the very minimum energy is used to run the motor. ABB’s new ACS580 general purpose drive is very well adapted to both save energy and meet the reporting requirements of the new standard. It fulfils the highest IE2 drive energy efficiency class and includes advanced energy efficiency analysers and energy optimiser controls. For compatibility, the drive supports energy efficient motor
makes both variable speed drives as well as motors, it can calculate and verify the IES values for the entire system.
CDM efficiency classes (IE) for variable speed drives are based on drive losses (% in watts) and measured at 90% frequency and 100% current.
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