Siemens SIRIUS Configuration Manual

General information
Configuring SIRIUS Innovations
16 Configuration Manual, 04/2010, A8E56203880102-02
Soft starting with soft starters
What is the basic principle of a soft starter?
Soft starters limit the starting current and starting torque. This reliably prevents mechanical
stress and mains voltage dips. The motor voltage is reduced using phase control and is
increased from an adjustable starting voltage up to the mains voltage within a specific ramp
time. Soft starting and stopping reduces the stress on connected equipment, thus ensuring
prolonged smooth and trouble-free production.
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Direct
starting
Soft
starter
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Wye-
delta
Soft
starter
Ramp
time
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Wye-
delta
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Motor torque
Direct
starting
Wye-
delta
Soft
starter
M
Rotat.
speed
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L1 L2 L3
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● 3RW30 soft starters for the soft starting of three-phase asynchronous motors for simple
applications
– performance range: up to 55 kW at 400 V (75 hp at 460 V)
● 3RW40 soft starters with integrated functions; solid-state motor overload and intrinsic
device protection and adjustable current limiting
– performance range: up to 250 kW at 400 V (300 hp at 460 V)
● The 3RW44 solid-state soft starters offer the following:
– soft starting and stopping
– solid-state motor overload and intrinsic device protection
– adjustable current limiting
– numerous functions for higher-level requirements
– performance range:
up to 710 kW at 400 V in standard circuit
up to 1200 kW at 400 V (1700 hp at 460 V) in the inside-delta circuit
Further information can be found in the Internet at: http://www.siemens.de/sanftstarter
(http://www.siemens.de/sanftstarter
).
For optimum configurations, we recommend using the selection and simulation program
"Win-Soft Starter". You can order or download under:
http://www.siemens.de/lowvoltage/demosoftware
(http://www.siemens.de/lowvoltage/d
e
mosoftware)
(Order Number: E20001-D1020-P302-V2-7400)

Siemens SIRIUS Specifications

General

Product brand name	Siemens
Series	SIRIUS
Coil Voltage	24V DC, 110V AC, 230V AC
Switching Capacity	Up to 10A
Mounting Type	DIN rail
Product designation	SIRIUS
Contact Material	Silver alloy
Contact Rating	Varies depending on the specific SIRIUS relay model (e.g., 6 A at 250 V AC, 10 A at 250 V AC)
Switching Voltage	Varies depending on the specific SIRIUS relay model (e.g., 250 V AC, 400 V AC)
Mechanical Life	Up to 10 million operations
Electrical Life	Up to 100, 000 operations
Operating Temperature	-25°C to +55°C
Protection Class	IP20
Size of relay base	Varies depending on the specific SIRIUS relay model