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New PDF release: Abb The Motor Guide Gb

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106 . U2 where C = capacitance, µF U = capacitor voltage, V Q = reactive power, kvar. P where P η K = constant from table on right P = rated power of motor, kW η = effiency of motor 68 4. 2 Power factor values The power factor values for the rated output are listed in technical data tables in our product catalogs. The table below illustrates typical values. ABB can supply guaranteed values on request. 54. 69 4. 8 Connection diagrams Connection of three phase, single speed motors ∆-connection Y connection Connection of two-speed motors Two-speed motors are normally connected as illustrated below; direction of rotation as given on page 35.

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. 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.

Please contact your nearest sales office for the MotSize calculation program. L. starting curves (1. L. starting curves (1. starting torque at Un, 2. starting torque at 80 per cent Un, torque at Un, 2. starting torque at 80 per cent Un, 3 torque load) for a cast iron motor. 3 torque load) for an aluminum motor. 51 4. 1 Soft starters A soft starter limits the starting current while providing a smooth start. The magnitude of the starting current is directly dependent on the static torque requirement during a start, and on the mass of the load to be accelerated.

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Abb The Motor Guide Gb

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