Frequently Asked Questions About Soft Starters

Can a soft starter be used with all motors?

Soft starters are designed specifically for use with AC induction motors and will not work on DC motors or those requiring precise speed control. A VFD would be better suited to an application requiring precision in speed.

What is the difference between a soft starter and a VFD?

A soft starter will control a motor when it starts and stops; it gradually increases from zero volts to the operating voltage and vice versa as it stops. A VFD will create precise control of the motorspeed by being able to adjust the voltage and frequency supplied to the motor while it is operating.

How can soft starters help with energy efficiency?

Soft starters will help reduce the inrush of current when starting, thus, reducing the peak energy demand of the motors. However, once the motor is up to speed, soft starters do not provide any further savings in terms of energy consumption during operation. Therefore, a VFD would be much more efficient for continued savings.

Are soft starters appropriate for heavy-duty applications?

Yes, soft starters are excellent for heavy-duty applications such as large pumps, fans, compressors, and conveyor systems that develop large amounts of inrush current and mechanical stresses while starting.

What is a built-in bypass type?

On many soft starters, there is a built-in bypass that enables the motor to be powered directly from the main supply once the motor has achieved its full speed. This substantially reduces electrical losses and increases the operating efficiency of the motor while it is in its steady-state condition.

What problems will soft starters help prevent?

Soft starters will help prevent electrical overloads, circuit breaker tripping, excessive mechanical wear and tear, pump hammering, and excessive heat buildup in electric motors during start-up conditions.

Soft starters offer a cost-effective, efficient, and reliable method of controlling the starting and stopping of AC motors. By controlling the amount of voltage supplied to the motor during the initial stages of starting, they reduce energy consumption, prolong the life of equipment, and reduce mechanical stress on equipment in all applications. Whether it is for an industrial pump or a conveyor system, a soft starter is necessary whenever equipment protection and increased operational efficiencies are the primary need.

When a business understands how a soft starter operates and its applications, they can determine the best motor control solution for their needs, maximizing efficiency and reducing operating costs. If you have any questions regarding whether a soft starter is the right choice for you, call an experienced representative or an expert before finalizing your decision to use one.