Soft Starters Offer Fast, Tool-Free Connection

The new DS7 soft starters from Eaton combine smooth starting and freedom from vibration, previously only available from three-phase units, with the space savings of two-phase soft starters. In addition, as fully integrated elements of the Eaton Xstart motor control range, they offer the convenience of fast, simple, tool-free connection with motor protection relays and circuit breakers, according to the company. DS7 soft starters, which are available with ratings from 1.1kW to 15kW on 400V three-phase supplies, feature a patented asymmetric triggering system that eliminates DC components in the supply to the motor during starting.

This ensures smooth starting, allows the units to deliver more starting torque and reduces motor heating. The low level of motor vibration during starting also minimises wear on mechanical components, extending their lives and reducing maintenance requirements. The new soft starters simply clip together with PKZ and PKE motor protection devices to produce complete starter assemblies. No additional wiring is needed for the power circuits, which not only saves time but also eliminates the possibility of wiring errors.

Accessory connectors are also available to provide plug-and-socket connections between the motor and the DS7 soft starter. When these are used, conventional motor terminals are no longer needed in the control panel. Soft starters in the DS7 range measure just 42mm in width - the same as Xstart motor protection devices - and therefore occupy very little space in the control panel. As supplied, they are rated for up to 10 starts per hour - each with a starting current of three times the full load for a maximum of five seconds.

More arduous duties can be accommodated by adding an optional cassette fan, which slips into place within the starter without affecting its overall dimensions. Eaton's new DS7 soft starters can be supplied for use with 24VAC/VDC or 110/230VAC control circuits. A Smartwire Darwin interface, designed to minimise control wiring, facilitate remote monitoring and allow straightforward interfacing with popular fieldbus systems, will be available soon.

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