Line operation
The three-phase AC motors are designed for duty type S1 according to IEC 60034 (continuous duty).
Inverter operation
For inverter operation (P91, P92) , the motors with the applicable voltages are also stamped with duty type Inv. Duty.
Depending on the selected voltage code the technical data for the operating points at 50Hz, 60Hz and 87Hz are specified on the name plate.
Motors with efficiency class IE2, that are subject to the Eco-design directive No. 640/2009, are stated with an additional label “IE2 Inv. Duty only".