Frequently asked questions

FAQ000209043

30 September 2021

ATS01N1 - These soft starters has only 1 thyristor control, which means it only reduces starting torque and not starting current.
By reducing the starting torque produced by an asynchronous motor, the ATS01N1 soft start extends the motor’s starting time.
The ATS01N1 soft start ramps up the AC voltage applied to one of the motor terminals, whereas the other motor terminal(s) are supplied full motor starting voltage. Hence, starting current is not reduced.

Applications :



ATS01N2 - These soft starters have 2 thyristors and control two phases of the AC voltage supplied to the motor in order to limit starting torque and current. This is ideal for applications that do not require high starting torque. It limits starting torque and reduces current inrush experienced with other motor starting methods. 

Applications :




Therefore, The N1 range can only reduce the torque jerking and protect the mechanical elements from stress, as it has only control on single phase and cannot limit current on the other two.
The N2 range can reduce both the torque jerking and the inrush current as it controls 2 of the 3 phases.

For current limitation options on soft starters, refer to FAQ in the link: http://www.se.com/se/en/faqs/FA416681/
For more details on ATS01 soft starters, refer to catalogue in the link: https://www.se.com/ww/en/product-range/779-altistart-01/#documents