Electrical Supplies

Soft starters & variable speed drivers

About

Motor starters control the use of electrical power to start and stop motors, safeguarding it by controlling voltage in order to prevent sudden surges.
Advantages of motor starters include safe starting, overload protection, reduced inrush current, and control over start/stop operations.
Motor starters work by controlling voltage delivery to the motor, initiating a soft start, and disconnecting power if an overload occurs.
Enclosed direct-on-line starters for use on AS-Interface line up to 5,5kW/400V

Application

Chosen at design stage according to the driven load: direct-on-line for small fans and pumps, soft starters where mechanical shock and inrush must be limited on a fixed-speed load, and variable speed drives where flow or airflow is modulated. In HVAC and pumping plant the drive itself becomes the energy-saving measure, since fan and pump power falls with the cube of speed.

Standards & Reference 5 cited

IEC/EN 60947-4-1
Electromechanical contactors and motor starters: the duty ratings and endurance a starter is selected on.
IEC/EN 60947-4-2
AC semiconductor motor controllers and starters: the part that covers soft starters, as distinct from the electromechanical starters in 60947-4-1.
IEC 61800-2
Ratings and performance requirements for adjustable-speed drive systems: how a variable speed drive is rated and declared.
IEC 61800-3
Electromagnetic compatibility for drive systems: the emission and immunity limits that stop a drive interfering with everything else on the site.
IEC 61800-5-1
Electrical, thermal and energy safety requirements for drive systems: the safety half of the drive standards, alongside the EMC part.

Request for quotation

Get a price for this item

Send the quantity and the project. Our sales engineers reply with a quotation, usually within one working day.