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61 4. 4 Duty types The following parameters are required to fully define the duty type: the cyclic duration factor, the number of duty cycles per hour (c/h), the moment of inertia of the load JL and the moment of inertia of the motor JM. g. 1 kgm2. D+N Cyclic duration factor = x 100% D+N+R S5 Intermittent duty with starting and electrical braking A sequence of identical duty cycles, each cycle consisting of a significant starting period, a period of operation at constant load, a period of rapid electric braking and a rest and de-energized period.

D+N Cyclic duration factor = x 100% D+N+R S5 Intermittent duty with starting and electrical braking A sequence of identical duty cycles, each cycle consisting of a significant starting period, a period of operation at constant load, a period of rapid electric braking and a rest and de-energized period. The duty cycles are too short for thermal equilibrium to be reached. The following parameters are required to fully define the duty type: the cyclic duration factor; the number of duty cycles per hour (c/h), the moment of inertia of the load JL and the moment of inertia of the motor JM.

E. shaft height, fixing dimensions and shaft extension dimensions, for various degrees of protection and sizes. It covers totally enclosed squirrel cage motors at 50 Hz, in frame sizes 56 to 315 M. Electrical design 4 4. 1 Insulation ABB Motors use class F insulation systems, which, with temperature rise B, is the most common requirement among industry today. Class F insulation system ■ Max ambient temperature 40° C ■ Max permissible temperature rise 105 K ■ Hotspot temperature margin + 10 K Class B rise ■ Max ambient temperature 40° C ■ Max permissible temperature rise 80 K ■ Hotspot temperature margin + 10 K Insulation system temperature class ■ Class F 155° C ■ Class B 130° C ■ Class H 180° C The use of Class F insulation with Class B temperature rise gives ABB Motors products a 25° C safety margin.

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