Altistart 48 Enclosed Altistart 48 Soft Starters Page 4 Introduction

4 Altistart 48 soft starters for asynchronous motors Introduction The Altistart 48 soft starter offers advanced electronic soft start - soft stop performance and a six thyristor power configuration to provide smooth torque- controlled acceleration and deceleration for three-phase asynchronous motors between 2 - 1200 HP (3 - 900 kW). The Altistart 48 is rated for three-phase voltages 208 to 690 V, 50/60 Hz, and for normal and heavy duty applications. The Altistart 48 features a patented advanced motor control algorithm called TCS, or Torque Control System. Without speed feedback, the Altistart 48 soft starter provides constant starting and stopping rates independent of motor loading, just like a more expensive AC drive. Setting the new industry standard for soft starters, the Altistart 48 controls the applied motor torque, making it ideal for a wider variety of applications than a traditional voltage ramp soft starter with current limit. In pumping applications, the Altistart 48 uses its Torque Control System to eliminate the long start and stop times, hydraulic transients, and slamming of check valves associated with "pump version" voltage ramp soft starts. The high-performance algorithms of the Altistart 48 contribute significantly to its robustness and ease of setup. The Altistart 48 is supplied ready for use in a standard duty application with 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. All devices include a built-in keypad display which can be used to modify the configuration to adapt it to the application and individual customer requirements. Introduction Applications Altistart 48 soft starters offer soft starting and deceleration functions, machine and motor protection functions, and functions for communicating with control systems. These functions are designed for use in the following normal or heavy duty applications in the buildings, food and beverage, and chemical industries: Application type Functions performed by the Altistart 48 Pumps Normal duty Better control of hydraulic transients: - Gradual pressurization of fluid in lines - Reduction of pressure surges and valve surges (in presence of line supply) - Elimination of damage to filters or spouts (irrigation) and premature wear of lines, etc. - Less stress on pipes with the reduction of pressure-over pressure phenomena Independent adjustment of the load conditions Protection against underload (running dry), loss or inversion of phases and in the event of a locked rotor Automatic switching of the motor to freewheel mode on stopping, when the flow rate of the pump drops to a low level, to prevent overheating. Conveyors Normal duty Gradual starting, reducing shocks and slipping of belts Overload control to detect faults, hard spots or jamming, or underload control to detect breaks Fans & high inertia machines Normal or Heavy duty (>30 s) Smooth starting, preventing stress on the drive chain and slipping of belts Smoke extraction" function Limitation of current and voltage drops on starting Catching on the fly of a fan rotating in reverse Detection of overload caused by clogging or underload (broken fan motor transmission) Braking torque on stopping Compressors Normal or Heavy duty (>30 s) Elimination of slipping of belts Reduction of current peaks Protection even for special motors Detection of inversion of direction of rotation of phases Contact for automatic emptying on stopping

Previous Page
Next Page