Siemens SIRIUS 3RW44 - Application Examples for Heavy Starting (CLASS 20); Application Examples for Normal Starting (CLASS 10); Normal or Heavy Starting

Configuration Instructions
SIRIUS 3RW44 manual
GWA 4NEB 535 2195-02 DS 06
2-3
2.2 Normal or Heavy Starting
To properly dimension a soft starter, it is important to know and take into account
the starting time (normal or heavy starting) of the application. Long starting times
mean a higher thermal load for the thyristors of the soft starter. The 3RW44 soft
starters are designed for continuous operation under normal starting conditions
(CLASS 10), an ambient temperature of 40 degrees Celsius and a fixed
switching frequency. You can also find these values in Chapter 10.3.2 "Technical
Data Power Unit". If deviations from these data occur, it may be necessary to
overdimension the soft starter. Using the Win Soft Starter selection and
simulation program from SIEMENS, you can enter your application data and
requirements, and the optimum soft starter for your application will be
dimensioned (refer to Chapter 10.3.9 "Accessories" software).
Selection criteria
Note
The appropriate size of the SIRIUS 3RW44 soft starter must be selected on the
basis of the motor rated current
(Rated current
soft starter
motor rated current).
2.2.1 Application Examples for Normal Starting (CLASS 10)
2.2.2 Application Examples for Heavy Starting (CLASS 20)
Normal starting CLASS 10 (up to 20 s with 350 % I
n motor
),
The soft starter's output can be the same as that of the implemented motor
Application
Conveyor belts
Powered roller
conveyors
Compressors Small ventilators Pumps Hydraulic pumps
Starting parameters
• Voltage ramp and current
limiting
-Start voltage % 70 60 50 30 30 30
- Starting time s
10 10 10 10 10 10
- Current limiting value
deactivated deactivated 4xI
M
4xI
M
deactivated deactivated
• Torque ramp
- Start torque 60 50 40 20 10 10
-End torque
150 150 150 150 150 150
- Starting time
10 10 10 10 10 10
• Breakaway pulse
deactivated (0 ms) deactivated (0 ms) deactivated (0 ms) deactivated (0 ms) deactivated (0 ms) deactivated (0 ms)
Stopping mode
Soft stop Soft stop Coasting down Coasting down Pump stop Coasting down
Heavy starting CLASS 20 (up to 40 s with 350 % I
n motor
),
The selected soft starter must have a power class that is 1 class higher than that of the implemented motor
Application Stirrers Centrifugal machines Milling machines
Starting parameters
• Voltage ramp and current
limiting
-Start voltage % 30 30 30
- Starting time s
30 30 30
- Current limiting value
4xI
M
4xI
M
4xI
M
• Torque ramp
- Start 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)
Stopping mode
Coasting down Coasting down Coasting down or DC braking