Motor Controller for Direct On-Line Starting

Direct on-line starting is the simplest way to start a motor, but it's also the roughest. In that first instant, the motor draws six to nine times its normal full load current, a surge that stresses the electrical supply, contactors and mechanical transmission all at once, every single time the motor is switched on.

Integra from Suresense provides a controlled alternative without requiring a full changeover to a different starting method. Its soft start function ramps the motor up smoothly, avoiding the sharp current surge of a conventional direct on-line start while still bringing the motor up to its fixed working speed reliably.

Once running, the motor continues to operate at the constant speed the application requires, with Integra then switching focus to continuously adjusting power output to match the real load through its ongoing load sensing function. For sites relying on direct on-line starting simply because it's the established method, Integra o

ffers a way to remove the associated current surge and mechanical shock without a disruptive change to how the equipment is wired or operated.

Suresense can advise on which motors within a direct on-line setup would benefit most from Integra, typically prioritising the largest units or those starting most frequently through the working day.