Siemens 3RW44 - Application Examples for Very Heavy Starting (CLASS 30)

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.