Siemens SIRIUS 3RW30 Manual page 107

The SIRIUS 3RW30 soft starter can be damaged in this application (set ramp time shorter
than the actual motor ramp-up time). A maximum ramp-up time of 20 s is possible for the
3RW30. An appropriately dimensioned SIRIUS 3RW40 or 3RW44 soft starter should be
chosen for startup processes with a motor ramp-up time > 20 s.
NOTICE
Risk of property damage
Make sure the selected ramp time is longer than the actual motor ramp-up time. If not, the
SIRIUS 3RW30 may be damaged because the internal bypass contacts close when the set
ramp time elapses. If the motor has not finished starting up, an AC3 current that could
damage the bypass contact system will flow.
When using the 3RW40: The 3RW40 has an integrated ramp-up detection function that
prevents this operating state from occurring.
SIRIUS 3RW30 / 3RW40
Manual, 10/2018, NEB535199502000/RS-AB/005
Commissioning
13.1 Commissioning the 3RW30
107