A soft start
3rd Quarter 2012
Other technologies
With a focus on small size and ease of installation, the Eaton DS7 line of reduced voltage solid state soft start controllers offers reliable and efficient soft starting. Designed to control the acceleration and deceleration of three-phase motors, the series is available for current ranges from 4 to 32 A.
Soft on the wallet, strong on torque
The reduced-voltage soft starter has become increasingly established as an alternative to the star-delta starter. With a focus on compact size and ease of commissioning, the Eaton DS7 line of reduced voltage solid-state soft start controllers is an ideal choice for safe, dependable soft starting. With an asymmetrical control method, startup is soft but at a higher torque value than other available solutions. Designed for typical applications such as pumps, fans and small conveyors, the compact DS7 Series is a reliable choice.
The modern alternative to star-delta starters
The electronic soft starter fulfils the need for an impact-free rise in torque and a significant reduction in maximum current during the start phase. This helps to prevent impacting of cog edges in the gearbox, water hammers in pipe systems, slipping of V-belts and jitter with conveyor systems.
The smallest soft start controller in its performance class, the DS7 Series is the perfect option for upgrading existing systems that may currently be using star-delta, autotransformers or across-the-line NEMAT and IEC starters. It offers the benefits of soft starting without having to change enclosure sizes or add additional assemblies – thus saving time and money.
Asymmetrical control: a truly soft start
An asymmetrical trigger control developed by Eaton makes it possible to achieve truly soft starts. It avoids DC current components that normally result in a two-phase controlled soft starter. This algorithm suppresses the formation of an elliptical rotating field, which leads to irregular acceleration of the motor and un-necessarily extends acceleration times. On DS7 series devices, an asymmetric trigger control is active during the start and stop ramp.
For more information contact Rob Hare, Eaton Electric, +27 (0)11 824 7400, robhare@eaton,com, www.eaton.com
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