Electro Adda SpA - Costruzioni elettromeccaniche

New standards concerning efficiency

The IEC has introduced two new standards concerning energy efficient motors:
- IEC/EN 60034-2-1 specifies new rules concerning efficiency testing methods;
- IEC 60034-30 defines new efficiency classes for motors.

IEC/EN 60034-2-1; 2007

The new standard IEC/EN 60034-2-1, which came into force September 2007, introduces new rules concerning the testing methods to be used for determining losses and efficiency.
It offers two ways of determining the efficiency; direct method and indirect method. The new standard specifies following parameters for determining the efficiency according to indirect method:
- reference temperature
- three options for determining additional load losses: measurement, estimation and mathematical.
The new Electro Adda SpA standard uses the indirect calculation method, additional load losses are determined from measuring.
The resulting efficiency values differ from those obtained under the previous IEC 60034-2-1996 testing standard. It must be noted that efficiency values are only comparable if they are measured using the same method.
The motor documentation must state which method is used.
The efficiency values on the technical data pages in this catalogue are given according to both new and old calculation methods. The table below shows the differences between old and new standard.

Old efficiency testing standard EN/IEC 60034-2-1996:

Direct method
Indirect method:
• PLL (= additional losses) estimated at 0.5 % of input power at rated load.
Winding losses in stator and rotor determined at 95°C.

New efficiency testing standard IEC/EN 60034-2-1-2007:

Direct method
Indirect method:
• Measurement; PLL calculated from load tests
• Estimation; PLL at 2.5% - 1.0% of input power at rated load between 0.1 kW and 1000 kW
• Mathematical calculation; Eh star - alternative indirect method with mathematical calculation of PLL. Winding losses in stator and rotor determined at 25°C + actual temperature rise measured.

IEC 60034-30; 2008

IEC 60034-30: October 2008 defines three IE (International Efficiency) efficiency classes of single speed, three phase, cage induction motors.
- IE1 = Standard efficiency (efficiency levels roughly equivalent to EFF2 in Europe nowadays)
- IE2 = High efficiency (efficiency levels roughly equivalent to EFF1 in Europe nowadays and identical to EPAct in USA for 60 Hz)
- IE3 = Premium efficiency (new efficiency class in Europe nowadays and identical to "NEMA Premium" in the USA for 60Hz)
Efficiency levels defined in IEC 60034-30 are based on tests methods specified in IEC 60034-2-1: 2007. Compared to old efficiency classes acc. to CEMEP agreement the scope been expanded.
IEC 60034-30 covers almost all motors (for example standard, hazardous area, marine, brake motors):
• Single-speed, three-phase, 50 Hz and 60 Hz
• 2, 4 or 6-pole
• Rated output from 0.75 to 375 kW
• Rated voltage UN up to 1000 V
Duty type S1 (continuous duty) or S3 (intermittent periodic duty) with a rated cyclic duration factor of 80% or higher capable of operating direct online
Following motors are excluded from IEC 60034-30:
- Motors made solely for converter operation
- Motors completely integrated into a machine (for example, pump, fan and compressor) that cannot be tested separately from the machine.

Table 1

Efficiency limit values acc. to IEC 60034-30; October 2008 standard; based on IEC 60034-2-1; 2007 standard