Normal Or Heavy Starting; Example Applications For Normal Starting (Class 10); Example Applications For Heavy Starting (Class 20) - Siemens Sirius 3RW44 System Manual

2.2

Normal or heavy starting

Selection criteria

2.2.1 Example applications for normal starting (Class 10)

Normal starting Class 10 (up to 20 s with 350% I
Selected soft starter output can be equal to the output of the motor used
Application
Starting parameter
• Voltage ramp and current
limiting
- Starting voltage
- Starting time
- Current limit value
• Torque ramp
- Starting torque
- End torque
- Starting time
• Breakaway pulse
Stopping mode

2.2.2 Example applications for heavy starting (Class 20)

Heavy starting Class 20 (up to 40 s with 350% I
The soft starter to be selected must be one output class higher than the motor used
Application
Starting parameter
• Voltage ramp and current
limiting
- Starting voltage
- Starting time
- Current limit value
• Torque ramp
- Starting torque
- End torque
- Starting time
• Breakaway pulse
Stopping mode
SIRIUS 3RW44 manual
GWA 4NEB 535 2195-02 DS 01
To achieve the optimum soft starter layout, 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 in the case of
normal starting (Class 10), an ambient temperature of 40 degrees Celsius and a
fixed switching frequency. You can also find these values in Section 9.3.2
Technical data power component. If deviations from these data occur, it may be
necessary to overdimension the soft starter. Using the Win-SOFTSTARTER
selection and simulation program from SIEMENS, you can enter your application
data and requirements, and it will determine the optimum soft starter
dimensions for your application (refer to Section 9.3.8 Accessories Software).
Notice
For the SIRIUS soft starter 3RW44, the corresponding soft starter must be
selected according to the motor rated current
(Rated current
soft starter
),
n motor
Conveyor belt Powered roller
conveyor
% 70 60
s 10 10
Deactivated Deactivated
60 50
150 150
10 10
Deactivated (0 ms) Deactivated (0 ms) Deactivated (0 ms) Deactivated (0 ms) Deactivated (0 ms) Deactivated (0 ms)
Soft stop Soft stop
),
n motor
Stirrers
% 30
s 30
4 x I
M
30
150
30
Deactivated (0 ms)
Coasting down
≥ motor rated current).
Compressor Small fan
50 30
10 10
4 x I 4 x I
M M
40 20
150 150
10 10
Coasting down Coasting down
Centrifugal machines
30
30
4 x I
M
30
150
30
Deactivated (0 ms)
Coasting down
Configuration instructions
Pump Hydraulic pump
30 30
10 10
Deactivated Deactivated
10 10
150 150
10 10
pump stop Coasting down
Milling machines
30
30
4 x I
M
30
150
30
Deactivated (0 ms)
Coasting down or DC braking
2-3