Configuration instructions
3.2 Startup class
3RW44 soft starters
24
Manual, 03/2017, NEB535219502000/RS-AB/008
3.2.3
Application examples for very heavy starting (CLASS 30)
Heavy starting CLASS 30 (up to 60 s with 350 % I
n
motor
)
The soft starter has to be selected two power classes higher than that of the implemented
motor.
Application
Large fans
Mills
Crushers
Circular
saws/bandsaws
Starting parameters
Voltage ramp and
current limiting
•
Starting voltage %
30
50
50
30
•
Starting time s
60
60
60
60
•
Current limiting
value
4 x I
M
4 x I
M
4 x I
M
4 x I
M
Torque ramp
•
Starting torque
20
50
50
20
•
End torque
150
150
150
150
•
Starting time
60
60
60
60
Breakaway pulse
Deactivated (0 ms)
80 %; 300 ms
80 %; 300 ms
Deactivated (0 ms)
Coasting method
Coasting down
Coasting down
Coasting down
Coasting down
Note
The settings and device dimensions indicated in these tables are examples only; they are
merely provided for information purposes and are not binding. Set values depend on the
application in question and must be optimized during commissioning.