What are the differences between the different motor control functions ?
Three solutions are proposed to realize a motor control function:
Direct On Line starter with contactor - the simplest solution that is appropriate for low and medium power motors that do not need frequent start-up. Depending on requirements, elaborate protection and monitoring devices can be associated here.
Soft starter - it enjoys the advantage of reducing the peak starting current which can avoid water hammer and respect mechanical parts in pump applications.
Variable speed drive - the most powerful solution with an ability to regulate flows in pump applications. It can also facilitate the optimization of energy consumption.
For more Infor, Thanks to check the Attached document.