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MST Digital Soft Starter MST Digital Soft Starter MST Digital Soft Starter Soft Starter MST Digital From the moment the first electrical motors were developed, The results are: engineers have been searching for ways to avoid electrical and • Overloaded lines and unacceptable voltage variation due to mechanical stress caused by the starting and stopping of motors. voltage and current transients from DOL and wye-delta starts. Problems with direct-on-line (DOL) starting include high inrush These transients can interfere with other equipment connected current, voltage spikes, and excessive mechanical wear that can to the power system, from dimming of lights to computer failure occur when motors start and stop. One traditional way to avoid this is to use a wye (aka “star”) delta starter, but this method is • Excessive mechanical wear across the entire drive chain, from in many applications insufficient, as problems with current spikes motor to driven equipment, causing an increase in service and and torque peaks remain. It also does not provide any way to repair and causing unwanted down time perform a soft stop. The MST Digital Soft Starter, on the other hand, will provide far better performance during a start, as well as • Operational problems, such as damage to products conveyed during a stop. from station to station Baldor has been producing soft starters for over 25 years. All of • For pump systems, water hammer and pressure surges put the experience we have gained has been combined with today’s excessive loading in pipelines from starting and stopping the digital technology and incorporated into the MST Digital Soft pumps Starter. Matching modern power electronics with smart circuitry and software, the Baldor MST Soft Starter offers superior control The financial consequences are considerable. Every technical of current and voltage during motor start and stop. It also offers problem and every breakdown costs money to diagnose and many new features that were unheard of in previous generations. repair, not to mention the loss in production. The Mechanical & Electrical Solution An economical and simple solution is to install a Baldor MST AC motors are the workhorse of industry. They are used for Digital Soft Starter. The Baldor MST Soft Starter provides smooth countless applications, including fans, crushers, agitators, pumps, starting and stopping that minimizes mechanical and electrical and conveyors to name a few. Too often, unnecessary and stress on your equipment. unwanted torque and current spikes are an everyday occurrence in production plants all over the world, damaging electrical equipment and causing unnecessary wear on mechanical systems. Motor voltage Motor current Torque wye/delta DOL wye/delta Softstart DOL 100% DOL wye/delta 70% Softstart 58% Softstart Adjustable ramp slope 30% Time Motor speed Motor speed (1) The MST soft starter provides a more gradual (2) It lowers starting current and eliminates (3) The MST soft starter eliminates sudden acceleration. spikes. and damaging changes in motor torque. The MST Soft Starter compared to direct-on-line (DOL) and wye-delta (aka “star-delta”) 2 www.baldor.com The Advanced Solution The MST Digital Soft Starter provides an advanced set of features Other advanced features include: including advanced protections, torque control, programmability • Built-in bypass (370A and above) and interface. • Display and keypad • Adjustable current limit MST Digital Advanced protections for not only the motor, but also the soft • Electronic motor overload protection Soft Starter starter and the load ensure trouble-free operation. Pre-warnings • Thermistor (PTC) input for motor protection detect problems before the motor needs to be stopped, which • Phase imbalance protection avoids unnecessary downtime. • Phase reversal protection • Locked rotor protection The torque control function was developed and tested in • Thyristor (SCR) overtemperature protection collaboration with pump manufacturers to ensure the best • Underload protection possible stop without water hammer and pressure surges. • Programmable warning functions • Analog output The full text LCD display shows what’s happening in plain English • Event logger or other language. Preprogrammed application settings provide for • External keypad option fast and efficient setup. Fault logging assists with troubleshooting and diagnostics. www.baldor.com 3 Pumps Soft Starter MST Digital Water is the world’s most important resource and water facilities can be found all over the world. Examples of water applications are freshwater and wastewater systems, circulating water for heating or cooling and irrigation. Industrial use • Process feed-water pumps • District heating pumps • Cooling water pumps • Slurry pumps Wastewater transportation • Influent and effluent pumps • Treatment pumps and fans Drinking water distribution • Distribution pumps • Booster pumps Irrigation Desalination • Intake pumps • Intake pumps • Distribution pumps Water transmission • Transfer pumps • Brine pumps • Distribution pumps • Booster pumps • Booster pumps • High pressure pumps • Drinking water pumps Water treatment • Treatment pumps Effluent water • Effluent pumps Raw water intake Raw water supply • Raw water intake pumps • Feed-water pump Waste incineration Effluent water • Effluent pumps • Effluent pumps • Fans • Conveyors Pumps: Q How are voltage drops avoided while starting? A Baldor MST Soft Starters will reduce the starting current, thus avoiding the voltage drop Q How is water hammer avoided while stopping? A Baldor MST Soft Starters use an optimized stop ramp and control motor torque to eliminate water hammer Q How does the MST Soft Starter protect the equipment? A Baldor MST Soft Starters are equipped with specially designed protection algorithms to monitor overload, underload, and locked rotor conditions 4 www.baldor.com Applications Fans: Fans Q How are extended voltage drops avoided during long starting times? A Baldor MST Soft Starters are equipped with current limit to keep control of the starting current MST Digital Soft Starter Q How is the life of the driving belts extended? A The Baldor MST Soft Starters reduce the mechanical stress during start, thus avoiding belt slippage Q How is the operation of the fan improved? A A Baldor MST Soft Starter with underload protection will detect a broken belt immediately and alert the operator to the problem Compressors: Q How is compressor life extended? A Using a Baldor MST Soft Starter for starting will reduce the accelerating torque, thereby minimizing the mechanical stress Compressors Q How is the compactness of the compressor enhanced? A Using a compact Baldor MST Soft Starter will reduce the size of starting equipment over a typical wye delta starter Conveyors: Q How is service and repair of the conveyor belt or chain reduced? A A Baldor MST Soft Starter will cause minimal mechanical stress on the conveyor belt Q How do you avoid running the conveyor belt in the wrong direction? A Use a Baldor MST Soft Starter with phase reversal protection Q How is efficiency of the conveyor belt improved? A Using the Baldor MST Soft Starter with high and low current Conveyors warnings allows you to adjust the load of the conveyor belt for optimal efficiency Q How is starting ensured even when there is high starting resistance? A A Baldor MST Soft Starter with kick start function will provide sufficient torque to be able to overcome the initial high friction from, for example, a temporarily jammed belt Q How often do fast starting conveyors cause material spillage or pileup? A Use Baldor MST Soft Starter to softly accelerate material handling conveyors www.baldor.com 5 MST Digital Soft Starter Soft Starter MST Digital Description MST Digital Soft Starter Baldor continues a proud tradition of offering the very latest in motor control technology by introducing the MST digital soft starter with six SCR three phase voltage control. Torque Control The torque control function was developed and tested in collaboration with pump manufacturers to ensure the best possible stop without water hammer and pressure surges. Bypass for Energy Savings Bypassing the soft starter after reaching full voltage saves energy and reduces heat. The MST soft starters are equipped with extra terminals making the connection to an external bypass contactor easy, while allowing all protections to be active during bypass. Soft starters starting at 370 Amps have a built-in bypass contactor, ensuring a compact solution that simplifies installation. Advanced Protections The MST soft starters are equipped with almost all protections imaginable for protecting the motor, the soft starter and the application. To offer more flexibility, protections can be tailored to specific needs. Features • Wide range of operational voltage 208 – 575 V AC Flexible Analog Output • Rated operational current 30 to 1040 A The analog output terminals can be connected to an analog • Full text display and 4 button keypad for easy setup and current meter to show the current during operation, eliminating operation the need for an additional current transformer. The analog output • Optional external keypad, IP66 (indoor) can also be used as an analog input to a PLC or indicating/ • Built-in bypass contactor (from 370 A) for energy savings and metering device. reduced cooling needs • Ready for external bypass (30 – 300 A) Display and keypad • Torque Control for excellent control of pumps The MST soft starter is equipped with a full text display showing • Current limit, adjustable between 1.5 – 7 x
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