This FAQ has been written for NEAL (North East Africa and Levant) region. If you are looking for information for another region, please select the correct country from the top-left dropdown in the page and 'Navigate to Browse FAQs' in the Support menu.
Please find the below document :
http://mt.schneider-electric.be/Main/Motorpact/catalogue/AMTED303042uk.pdf
in page 2 & 3 and i found that the main difference is in the deceleration option that is shown in the flow chart
this application guide (AMTED303042) is the best document to help selecting the good Motor starter type
However we need to clarify the below points :
1. The selection of the good Motor starter type is strongly dependent on the customer application, there is no need to penalize the customer with more investment (RVSS) while his application can be covered by RVAT
2. RVAT : Reduced Voltage Auto-Transformer motor starter is mainly used when the network cannot withstand high inrush current. An auto-transformer motor starter provides reduced voltage to the motor terminals during starting, with a three phase auto-transformer. It reduces the line current and provides the right starting torque.
3.RVSS: Reduced Voltage SoftStart motor starter is providing smooth, stepless acceleration and deceleration regardless of the load. This starting method lowers the starting current of the motor, reduces electrical stresses on the network and the motor. It reduces peak starting torque stresses on both the motor and mechanical load components, thereby providing longer service life and less downtime.
http://mt.schneider-electric.be/Main/Motorpact/catalogue/AMTED303042uk.pdf
in page 2 & 3 and i found that the main difference is in the deceleration option that is shown in the flow chart
this application guide (AMTED303042) is the best document to help selecting the good Motor starter type
However we need to clarify the below points :
1. The selection of the good Motor starter type is strongly dependent on the customer application, there is no need to penalize the customer with more investment (RVSS) while his application can be covered by RVAT
2. RVAT : Reduced Voltage Auto-Transformer motor starter is mainly used when the network cannot withstand high inrush current. An auto-transformer motor starter provides reduced voltage to the motor terminals during starting, with a three phase auto-transformer. It reduces the line current and provides the right starting torque.
3.RVSS: Reduced Voltage SoftStart motor starter is providing smooth, stepless acceleration and deceleration regardless of the load. This starting method lowers the starting current of the motor, reduces electrical stresses on the network and the motor. It reduces peak starting torque stresses on both the motor and mechanical load components, thereby providing longer service life and less downtime.
Released for: Schneider Electric Egypt and North East Africa
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