Siemens 3RW44 - Application Examples for Heavy Starting (CLASS 20)

Configuration instructions
3.2 Startup class
3RW44 soft starters
Manual, 03/2017, NEB535219502000/RS-AB/008
23
3.2.2
Application examples for heavy starting (CLASS 20)
Heavy starting CLASS 20 (up to 40 s with 350 % I
n motor
)
The soft starter has to be selected one power class higher than that of the implemented
motor.
Application
Stirrers
Centrifuges
Milling machines
Starting parameters
Voltage ramp and current
limiting
• Starting voltage %
30 30 30
• Starting time s
30 30 30
• Current limiting value
4 x I
M
4 x I
M
4 x I
M
Torque ramp
• Starting torque
30 30 30
• End torque
150 150 150
• Starting time
30 30 30
Breakaway pulse
Deactivated (0 ms)
Deactivated (0 ms)
Deactivated (0 ms)
Coasting method
Coasting down Coasting down Coasting down or DC
braking