Sirius 3RW30 devices have two-phase thyristor control, which ensures that the minimum operating current is maintained in all three phases and cuts off the negative component of the direct current.
Smooth voltage regulation using a softstarter eliminates the inevitable peak currents and torques in star-triangle starters.
Note: the installation of capacitive elements (reactive power compensators) is not allowed in the power circuit between thyristor soft starters and a controlled electric motor.
Distinctive features of Siemens Sirius 3RW30 soft starter devices
- A shunt contactor built into the device body: the probability of overheating of semiconductor elements /thyristors is reduced, heat losses are minimized, and the compactness of the device is ensured.
- Adjustable limitation of inrush current and torque: smoothing voltage dips, damping mechanical loads, reducing wear of mechanical components and increasing service intervals.
Technical characteristics of Siemens Sirius 3RW40 series soft starters
Rated power: 1.5 – 55 kW;
Rated current: 3 – 106 A;
Rated operating voltage: 200 – 480 V AC;
Voltage supply of electronics: 24 V AC/DC, 110...230 V AC/DC;
Acceleration/stop voltage level: 40...100%;
Acceleration and run-out time: 0...20s;
Power thyristor control: 2-phase;
Temperature range: -25...+60°C;
Degree of protection: IP00.
Scope of application: pumps (heat pumps, hydraulic pumps), presses, conveyors, roller conveyors, roller conveyors, augers.
Built-in controls, indications,connection terminals
Bypass/shunt contactor built into the device housing;
Input terminals of the control voltage Uc;
Built–in control potentiometers 2 pcs. (U – "Initial voltage level", t - "Acceleration time");
Status LEDs 2 pcs. (DEVICE – "Control voltage is applied, the soft starter is in good working condition", STATE/BYPASSED/FAILURE – "Acceleration of the electric motor is over" /"Bypass is on"/"Error");
Digital control input IN – "Starting the acceleration of the electric motor";
The digital output of the device is ON – "The IN signal is given /The acceleration of the electric motor is started";
Screw or spring terminals for connection of power and signal circuits;
For more information about the controls and displays, see the manual on page 79.
Built-in motor control and control functions
Soft start and stop function of the electric motor;
The function of limiting the starting current of the electric motor;
The function of limiting the starting torque of the electric motor;
Operating modes of Siemens Sirius 3RW30 soft starters and applications
Normal starting conditions (Class 10): maximum start-up time is 10 seconds, starting current is 300%, 5 starts/hour;
Application: hydraulic pumps, presses, belt conveyors, roller conveyors, screw conveyors, escalators, reciprocating compressors, screw compressors, low-capacity fans, centrifugal fans, drives of auxiliary mechanisms.
Recommended parameters of Siemens soft starters for various applications
type of equipment | U start /Un, | T start, with | I limit /In | T stop, with | mode/class |
Pumps | 40 | 10 | 3 – 4 | 10 | 10 |
Hydraulic pumps | 40 | 10 | 3 – 4 | 0 | 10 |
The press | 40 | 10 | 5 | 0 | 10 |
Belt conveyors | 70 | 10 | 5 | 5 | 10 |
Roller shutters | 60 | 10 | 5 | 5 | 10 |
Screw conveyors | 50 | 10 | 5 | 5 | 10 |
Escalators | 60 | 10 | 4 | 0 | 10 |
Reciprocating compressors | 40 | 10 | 4 | 0 | 10 |
Screw compressors | 50 | 10 | 4 | 10 | 10 |
Standard fans | 40 | 10 | 4 | 10 | 10 |
Centrifugal blowers | 40 | 10 | 4 | 10 | 10 |
Auxiliary drives | 40 | 10 | 4 | 10 | 10 |
Typical schemes for including a softstarter in the power supply and control circuit of an electric motor
Fig.1 The scheme of starting the electric motor through the SCP and the network contactor; Fig.2 The scheme of starting an electric motor with an electromagnetic brake.
For the entire list of possible options for including soft-start devices in the power supply and control circuit of an asynchronous electric motor, see the manual on page 187.
Designation of the registered number for Siemens Sirius 3RW30 softstarters
3RW | 30 | 26 | - | 1 | B | B | 1 | 4 |
I | II | III |
| IV | V | IV | VII | VIII |
II – model of the Siemens soft starter;
III – Rated operating power and rated operating current
parameter III | Pn, kW | In, And | parameter III | Pn, kW | In, And |
13 | 1,5 | 3,6 | 28 | 18,5 | 38 |
14 | 3,0 | 6,5 | 36 | 22 | 45 |
16 | 4,0 | 9,0 | 37 | 30 | 63 |
17 | 5,5 | 12,5 | 38 | 37 | 72 |
18 | 7,5 | 17,6 | 46 | 45 | 80 |
26 | 11 | 25 | 47 | 55 | 106 |
27 | 15 | 32 | - | - | - |
IV – connection type: 1 – screw connection, 2 – screw connection of the power circuit /spring connection of the auxiliary circuit;
V – thermistor protection (B – without protection, C – with thermistor protection);
VI – special function (B – bypass/bypass contactor);
VII – control voltage Uc:0 – 24 V AC/DC, 1 – 110...230 V AC/DC;
VIII – operating voltage Ue: 4 – 200...480 V.
Nominal characteristics of Siemens Sirius 3RW30 series soft starters
Operating voltage 200...480V, control voltage 24V AC/DC, normal start-up, line connection
Order No. (screw.) | order No. (springs) | Pn, kW (at 230V) | Pn, kW (at 400V) | In, And |
3RW3013-1BB04 | 3RW3013-2BB04 | 0,75 | 1,5 | 3,6 |
3RW3014-1BB04 | 3RW3014-2BB04 | 1,5 | 3,0 | 6,5 |
3RW3016-1BB04 | 3RW3016-2BB04 | 2,2 | 4,0 | 9,0 |
3RW3017-1BB04 | 3RW3017-2BB04 | 3,0 | 5,5 | 12,5 |
3RW3018-1BB04 | 3RW3018-2BB04 | 4,0 | 7,5 | 17,6 |
3RW3026-1BB04 | 3RW3026-2BB04 | 5,5 | 11 | 25 |
3RW3027-1BB04 | 3RW3027-2BB04 | 7,5 | 15 | 32 |
3RW3028-1BB04 | 3RW3028-2BB04 | 11 | 18,5 | 38 |
3RW3036-1BB04 | 3RW3036-2BB04 | 11 | 22 | 45 |
3RW3037-1BB04 | 3RW3037-2BB04 | 18,5 | 30 | 63 |
3RW3038-1BB04 | 3RW3038-2BB04 | 22 | 37 | 72 |
3RW3046-1BB04 | 3RW3046-2BB04 | 22 | 45 | 80 |
3RW3047-1BB04 | 3RW3047-2BB04 | 30 | 55 | 106 |
Operating voltage 200...480V, control voltage 110... 230V AC/DC, normal start-up, line connection
Order No. (screw.) | order No. (springs) | Pn, kW (at 230V) | Pn, kW (at 400V) | In, And |
3RW3013-1BB14 | 3RW3013-2BB14 | 0,75 | 1,5 | 3,6 |
3RW3014-1BB14 | 3RW3014-2BB14 | 1,5 | 3,0 | 6,5 |
3RW3016-1BB14 | 3RW3016-2BB14 | 2,2 | 4,0 | 9,0 |
3RW3017-1BB14 | 3RW3017-2BB14 | 3,0 | 5,5 | 12,5 |
3RW3018-1BB14 | 3RW3018-2BB14 | 4,0 | 7,5 | 17,6 |
3RW3026-1BB14 | 3RW3026-2BB14 | 5,5 | 11 | 25 |
3RW3027-1BB14 | 3RW3027-2BB14 | 7,5 | 15 | 32 |
3RW3028-1BB14 | 3RW3028-2BB14 | 11 | 18,5 | 38 |
3RW3036-1BB14 | 3RW3036-2BB14 | 11 | 22 | 45 |
3RW3037-1BB14 | 3RW3037-2BB14 | 18,5 | 30 | 63 |
3RW3038-1BB14 | 3RW3038-2BB14 | 22 | 37 | 72 |
3RW3046-1BB14 | 3RW3046-2BB14 | 22 | 45 | 80 |
3RW3047-1BB14 | 3RW3047-2BB14 | 30 | 55 | 106 |
