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S2 Short-time duty Operation at constant load during a given time, less than that required to reach thermal equilibrium, followed by a rest and de-energized period of sufficient duration to allow motor temperature to return to the ambient, or cooling temperature. The values 10, 30, 60 and 90 minutes are recommended for the rated duration of the duty cycle. g. S2 60 min. Explanation to figures: P = output power D = acceleration N = operation under rated condition F V R PN = = = = electrical braking operation of no load at rest and de-energized full load 60 4.

The table below illustrates typical values for part load. For instance, a motor with an efficiency value 90 has a 3/4 load value of 90, a 1/2 load value of 89 and a 1/4 value of 85. ABB can supply guaranteed part load values on request. 66 4. 7 Power factor A motor consumes both active power, which it converts into mechanical work, and also reactive power, which is needed for magnetization but does not perform any work. The active and reactive power, represented in the diagram (below) by P and Q, together give the apparent power S.

S9 according to IEC 34-1 and VDE 0530 Part 1. The outputs given in the catalogs are based on continuous running duty, S1, with rated output. In the absence of any indication of the rated duty type, continuous running duty is assumed when considering motor operation. S1 Continuous running duty Operation at constant load of sufficient duration for thermal equilibrium to be reached. Designation S1. S2 Short-time duty Operation at constant load during a given time, less than that required to reach thermal equilibrium, followed by a rest and de-energized period of sufficient duration to allow motor temperature to return to the ambient, or cooling temperature.

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