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Extra info for Abb The Motor Guide Gb
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. 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.
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. By continually adapting the motor voltage to the actual requirement automatically, a soft starter will generally save energy, particularly when the motor runs with a light load.
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.