NORD Drivesystems B1091-1 - Manual (Page 26)

Motors in fi operation for Category 3D – Planning guideline for B 1091
26 B 1091-1 GB-3213
3. Appendix
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3.1 Abbreviations
3D Rare occurrence of thrown-up
dust in an explosive atmosphere
ATEX Atmospheres explosibles IE1 Motors with standard efficiency
DIN German industrial standard IE2 Motors with high efficiency
EN European standard V/f Voltage/frequency characteristic
curve
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3.2 Legend / Formula symbols
cos φ Power factor M Torque [Nm] or [%]
Tu Ambient temperature [°C] n Speed [min
-1
] or [rpm]
T125 / T140 max. surface temperature [°C] P
N
Rated power [kW]
f
s
Stator frequency [Hz] R
St
Resistance on line [ Ω]
f
N
Nominal frequency [Hz] U
N
Rated voltage [V]
I
N
Nominal motor current [A]
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