Altistart 48 Enclosed Altistart 48 Soft Starters Page 5 Introduction

5 Altistart 48 soft starters for asynchronous motors Introduction Smarter starting with Torque Control System The Altistart 48 offers many strong starting features including the patented Torque Control System (TCS). TCS applies the torque to the motor during the entire starting phase as long as the current required ( Curve 1 ) does not exceed the limiting current ( Is1 ). With TCS present in the starting process, the accelerating torque can be virtually constant over the entire speed range ( Curve 2 ). With conventional starting using only current limitation ( Is1 ), the accelerating torque applied to the motor is equal to the motor torque minus the resistive torque. The accelerating torque increases in the starting range as the speed changes and is at its highest at the end of acceleration ( Curve 4 ). This causes the load to be taken up very abruptly, which is not recommended for pump type applications. It is also possible to configure the Altistart 48 to obtain a high torque on starting, for a rapid motor speed rise while limiting its temperature rise, and a lower torque at the end of starting for gradual loading. This control function is ideal for centrifugal pumps of for machines with high resistive torque on starting. Stopping with the Altistart 48 Freewheel stop: the motor coasts to a complete stop TCS soft stop: this type of stop is ideal for pumps. It can be used to effectively reduce pressure surges. Torque control on the ATS48 soft starter reduces the effect of hydraulic transients even if the load increases. This type of control makes adjustment easy. Adjustable from 1 to 60 seconds. InTele braking: this type of stop is suitable for high inertia applications because it reduces the stopping time of the machine. Product The Altistart 48 is offered in the following voltage range: ATS48 ppp Y for three-phase motors, 208 V to 600 V @ 50/60 Hz The ATS48 soft starter is a cost-effective solution which can: Reduce machine operating costs by reducing mechanical stress and improving machine availability Reduce the stress placed on the electrical distribution system by reducing line current peaks and voltage drops during motor starts These benefits allow you to save costs through more efficient and intelligent use of your application devices while protecting your equipment from other harmful starting and stopping methods. t 4 1 3 2 0.5 1 0 I/In N/Ns 3 4 Is1 Conventional Starting with Current Limitation 4 1 3 2 0.5 1 0 I/In N/Ns 1 2 t Is1 Altistart 48 with Torque Control System

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