Altistart 48 Enclosed Altistart 48 Soft Starters Page 45 Enclosed Altistart 48

45 Altistart 48 soft starters for asynchronous motors Selection criteria Enclosed Altistart 48 Selection Criteria In addition to the chosen application, the choice of starter will depend on the following main criteria: AC mains voltage supply: - Three-phase AC voltage: 208, 240, 480, or 600 V Power and nominal current (In) indicated on the motor name plate Duty cycle Starting current capacity Whether an application is a standard duty or severe duty application determines the limiting values of the current and the duty cycle ratings. Duty cycle S1 motor duty: Duty cycle of starting followed by operation at constant load enabling the thermal stability to be reached. S4 motor duty: Duty cycle of starting, operation at constant load, and an idle period. This cycle is characterized by a load factor. These motor duties are described in more detail in IEC 60034-1. Starting current capacity - Standard duty In standard duty applications, the ATS48 soft starter is designed to provide: S1 motor duty: - Starting at 4 In for 23 seconds with a cold motor - Starting at 3 In for 46 seconds with a cold motor S4 motor duty (with a load factor of 50% and 10 starts per hour) : - Starting at 4 In for 12 seconds - Starting at 3 In for 23 seconds - or an equivalent thermal cycle The motor thermal protection conforms to Class 30, Class 25, Class 20 (severe duty application), Class 15, Class 10 (standard duty application), Class 10 A, and sub-class 2 motor thermal overload protection (see page 10). Starting current capacity - Severe duty In severe duty applications, the ATS48 soft starter is designed to provide: S1 motor duty: - Starting at 4 In for 48 seconds with a cold motor - Starting at 3 In for 90 seconds with a cold motor S4 motor duty (with a load factor of 50% and with 5 starts per hour) : - Starting at 4 In for 23 seconds - or an equivalent thermal cycle The motor thermal protection conforms to Class 30, Class 25, Class 20 (severe duty application), Class 15, Class 10 (standard duty application), Class 10 A, and sub-class 2 motor thermal overload protection (see page 10). Selecting the Soft Starter First, identify the application type and corresponding starting current on page 46. Once the application type has been identified, begin building your unique part number using the information presented on pages 48-51, according to your supply voltage and the motor power requirements. Asynchronous motor Ts : Across the line starting torque Is : Across the line starting current Altistart 22 Ts1: Total torque range available with an Altistart 48, which is dependent on the current limit ( Is1 ) setting. Load Tr: Resistive torque must always be less than the Ts1 torque, or the motor will not start. Torque Characteristic % Motor Speed

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