Soft Start Motor Starters suit limited-space applications.

Press Release Summary:

RoHS-compliant PSR Softstarters offer knob-adjustable functions for starting and stopping 3-45 A, 3-phase motors up to 600 Vac. Mountable in small control panels and equipment enclosures, model range includes 3 physical sizes with widths from 1.77-2.13 in. available for control voltages of 24 Vdc or 100-240 Vac. All sizes include Run signal relay, while sizes 25-45 A add signal relay for TOR or full voltage. Solutions can be remote controlled via bus communication.

Original Press Release:

New Softstarters (from ABB) Enter NA Market Today; Compactness Frees Real Estate

Wichita Falls, Texas, February 19, 2007 . . . ABB's new PSR model softstarters offer users a full set of knob-adjustable functions for starting and stopping 3 to 45 A, three-phase motors, up to 600 VAC ? all in a compact package that easily mounts in small control panels and equipment enclosures.

"This smaller size provides cost savings for custom panel and industrial equipment designs, both as a product, and in the real estate it frees up to panel builders for other uses," noted Lorenz Eggenschwiler, product marketing, ABB Low Voltage Products & Systems. "The PSR offers a very small footprint solution for machine designers where installation space must be reduced."

Wider Range Saves Inventory Needed ?

The PSR range includes three physical sizes, with widths from 1.77 ? 2.13 inches (45 to 54 mm), covers rated currents from 3 to 45 A, up to 600 VAC, and is available for control voltages of 24 V DC or 100-240 V AC. All sizes include a "Run" signal relay, while sizes from 25 to 45 A add a signal relay for "TOR" or full voltage. These can be attached to an automation control system to provide closed-loop control or operator indication.

The wider operating voltage range of the PSR also "provides a reduction in the cost of back-up inventory required to support multiple OEM equipment manufacturing applications," noted Eggenschwiler ? "less inventory, but more range." It also can reduce inventory needed for maintenance-critical, 100% uptime, municipal- and process-control applications, he said.

Extremely Fast Installation -

The new softstarter family has a clearly marked front panel with knob adjustments for the three operational settings (no programming is required). The connection terminals are clearly marked and an installation diagram is included to allow easy, fast, positive mounting and connection. The enclosure can be either DIN rail or screw mounted.

Flexible Communication ?

PSR units also can be remote controlled via bus communication using ABB's FieldBusPlug. The FieldBusPlug accessories are available for several protocols, including Profibus DP and DeviceNet.

Soft Ramp Ups and Ramp Downs of Motors ?

A softstarter ensures the smooth starting and/or stopping of AC motors by reducing the effective voltage. This facilitates reducing the in-rush current and the current required throughout acceleration to full speed or TOR. Soft starting motors is popular with end users who want to improve equipment design reliability by eliminating the stress on drive train components typical with full voltage starting methods. Applications where drive train reliability is critical include pumps, fans, mixers and crushers. Reduced voltage starting is important in conveyor applications where any initial start-up jolt would break fragile product or create a safety hazard; in people movers like escalator, elevators and moving walkways.

The compact PSR Softstarter is an ideal design alternative for motor starting. When selected over other approaches, it provides control feedback, consistent acceleration, and improved drive component reliability.

The PSR Softstarter range has been tested and approved for UL and CCC, includes the CE logo and meets the directives of RoHS.

ABB, Automation Products, Low Voltage Products & Systems is a leading manufacturer and supplier of controls products ( ABB Low Voltage Products sales now offers both drives and controls products from a single point of sales contact.

ABB ( is a leader in power and automation technologies that enable utility and industry customers to improve their performance while lowering environmental impact. The ABB Group of companies operates in around 100 countries and employs about 107,000 people.

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