Speedfax 2017
For Operation in the Control Cabinet 3RW Soft Starters 3RW44 for high-feature applications More information Application examples for normal starting (Class 10) Normal starting Class 10 (up to 20 s with 350 % I n motor ), The soft starter rating can be selected to be as high as the rating of the motor used. Application Conveyor belt Roller conveyor Compressor Small fan Pump Hydraulic pump Starting parameters 1) • Voltage ramp and current limiting - Starting voltage % 70 60 50 30 30 30 - Starting time s 10 10 10 10 10 10 - Current limit value Deactivated Deactivated 4 x I M 4 x I M Deactivated Deactivated • Torque ramp - Starting 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) Ramp-down mode Smooth rampdown Smooth rampdown Free ramp-down Free ramp-down Pump ramp-down Free ramp-down Soft Starter Control 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 rating class higher than the motor used. Application Mixer Centrifuge Milling machine Starting parameters 1) • Voltage ramp and current limiting - Starting voltage % 30 30 30 - Starting time s 30 30 30 - Current limit 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) Ramp-down mode Free ramp-down Free ramp-down Free ramp-down or DC braking Application examples for very heavy starting (Class 30) 17 CONTROL PRODUCTS Very heavy starting Class 30 (up to 60 s with 350 % I n motor ), The soft starter has to be selected two rating classes higher than the motor used. Application Large fan Mill Crushers Circular saw/bandsaw Starting parameters 1) • Voltage ramp and current limiting - Starting voltage % 30 50 50 30 - Starting time s 60 60 60 60 - Current limit value 4 x I M 4 x I M 4 x I M 4 x I M • Torque ramp - Starting torque 20 50 50 20 - End torque 150 150 150 150 - Starting time 60 60 60 60 • Breakaway pulse Deactivated (0 ms) 80 %, 300 ms 80 %, 300 ms Deactivated (0 ms) Ramp-down mode Free ramp-down Free ramp-down Free ramp-down Free ramp-down Note: These tables present sample set values and device sizes. They are intended only for the purposes of information and are not binding. The set values depend on the application in question and must be optimized during start-up. The soft starter dimensions should be checked where necessary with the Win-Soft Starter software or with the help of Technical Assistance. 1) Actual motor starting times are load dependent. 17-218 Siemens Industry, Inc. SPEEDFAX Product Catalog
For Operation in the Control Cabinet 3RW Soft Starters 3RW44 for high-feature applications Circuit concept The SIRIUS 3RW44 soft starters can be operated in two different types of circuit. • Inline circuit The controls for isolating and protecting the motor are simply connected in series with the soft starter. The motor is connected to the soft starter with three cables. • Inside-delta circuit The wiring is similar to that of wye-delta starters. The phases of the soft starter are connected in series with the individual motor windings. The soft starter then only has to carry the phase current, amounting to about 58 % of the rated motor current (conductor current). Comparison of the types of circuit Inline circuit: Rated current I e corresponds to the rated motor current I n , 3 cables to the motor Configuration The 3RW44 solid-state soft starters are designed for normal starting. In case of heavy starting or increased starting frequency, a larger device must be selected. For long starting times it is recommended to have a PTC sensor in the motor. This also applies for the ramp-down modes smooth ramp-down, pump ramp-down and DC braking, because during the ramp-down time in these modes, an additional current loading applies in contrast to free ramp-down. In the motor feeder between the SIRIUS 3RW soft starter and the motor, no capacitive elements are permitted (e. g. no reactivepower compensation equipment). In addition, neither static systems for reactive-power compensation nor dynamic PFC (Power Factor Correction) must be operated in parallel during starting and ramp-down of the soft starter. This is important to prevent faults arising on the compensation equipment and/or the soft starter. All elements of the main circuit (such as fuses and controls) should be dimensioned for direct starting, following the local short-circuit conditions. Fuses, controls and overload relays must be ordered separately. A bypass contact system and solid-state overload relay are already integrated in the 3RW44 soft starter and therefore do not have to be ordered separately. The harmonic component load for starting currents must be taken into consideration for the selection of motor starter protectors (selection of release). Note: When induction motors are switched on, voltage drops normally appear on starters of all types (direct starters, wye-delta starters, soft starters). The infeed transformer must always be dimensioned such that the voltage dip when starting the motor remains within the permissible tolerance. If the infeed transformer is dimensioned with only a small margin, it is best for the control voltage to be supplied from a separate circuit (independently of the main voltage) in order to avoid the potential switching off of the soft starter. Device interface, PROFIBUS DP communication module, Soft Starter ES parameterizing and operating software The 3RW44 electronic soft starters have a PC interface for communicating with the Soft Starter ES software or for connecting the external display and operator module. If the optional PROFIBUS communication module is used, the 3RW44 soft starter can be integrated in the PROFIBUS network and communicate using the GSD file or Soft Starter ES Premium software. Soft Starter Control 17 CONTROL PRODUCTS Inside-delta circuit: Rated current I e corresponds to approx. 58 % of the rated motor current I n , 6 cables to the motor (as with wye-delta starters) Which circuit? Using the inline circuit involves the lowest wiring outlay. If the soft starter to motor connections are long, this circuit is preferable. With the inside-delta circuit there is double the wiring complexity but a smaller size of device can be used at the same rating. It is also recommended to use an isolating contactor in series with each motor winding. Thanks to the choice of operating mode between the inline circuit and inside-delta circuit, it is always possible to select the most favorable solution. The braking function is possible only in the inline circuit. Siemens Industry, Inc. SPEEDFAX Product Catalog 17-219
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For Operation in the Control Cabinet<br />
3RW Soft Starters<br />
3RW44 for high-feature applications<br />
More information<br />
Application examples for normal starting (Class 10)<br />
Normal starting Class 10 (up to 20 s with 350 % I n motor ),<br />
The soft starter rating can be selected to be as high as the rating of the motor used.<br />
Application Conveyor belt Roller conveyor Compressor Small fan Pump Hydraulic pump<br />
Starting parameters 1)<br />
• Voltage ramp and current<br />
limiting<br />
- Starting voltage % 70 60 50 30 30 30<br />
- Starting time s 10 10 10 10 10 10<br />
- Current limit value Deactivated Deactivated 4 x I M 4 x I M Deactivated Deactivated<br />
• Torque ramp<br />
- Starting torque 60 50 40 20 10 10<br />
- End torque 150 150 150 150 150 150<br />
- Starting time 10 10 10 10 10 10<br />
• Breakaway pulse<br />
Deactivated (0 ms) Deactivated (0 ms) Deactivated (0 ms) Deactivated (0 ms) Deactivated (0 ms) Deactivated (0 ms)<br />
Ramp-down mode<br />
Smooth rampdown<br />
Smooth rampdown<br />
Free ramp-down Free ramp-down Pump ramp-down Free ramp-down<br />
Soft Starter<br />
Control<br />
Application examples for heavy starting (Class 20)<br />
Heavy starting Class 20 (up to 40 s with 350 % I n motor ),<br />
The soft starter has to be selected one rating class higher than the motor used.<br />
Application Mixer Centrifuge Milling machine<br />
Starting parameters 1)<br />
• Voltage ramp and current<br />
limiting<br />
- Starting voltage % 30 30 30<br />
- Starting time s 30 30 30<br />
- Current limit value 4 x I M 4 x I M 4 x I M<br />
• Torque ramp<br />
- Starting torque 30 30 30<br />
- End torque 150 150 150<br />
- Starting time 30 30 30<br />
• Breakaway pulse Deactivated (0 ms) Deactivated (0 ms) Deactivated (0 ms)<br />
Ramp-down mode Free ramp-down Free ramp-down Free ramp-down or DC braking<br />
Application examples for very heavy starting (Class 30)<br />
17<br />
CONTROL<br />
PRODUCTS<br />
Very heavy starting Class 30 (up to 60 s with 350 % I n motor ),<br />
The soft starter has to be selected two rating classes higher than the motor used.<br />
Application Large fan Mill Crushers Circular saw/bandsaw<br />
Starting parameters 1)<br />
• Voltage ramp and current<br />
limiting<br />
- Starting voltage % 30 50 50 30<br />
- Starting time s 60 60 60 60<br />
- Current limit value 4 x I M 4 x I M 4 x I M 4 x I M<br />
• Torque ramp<br />
- Starting torque 20 50 50 20<br />
- End torque 150 150 150 150<br />
- Starting time 60 60 60 60<br />
• Breakaway pulse Deactivated (0 ms) 80 %, 300 ms 80 %, 300 ms Deactivated (0 ms)<br />
Ramp-down mode Free ramp-down Free ramp-down Free ramp-down Free ramp-down<br />
Note:<br />
These tables present sample set values and device sizes. They<br />
are intended only for the purposes of information and are not<br />
binding. The set values depend on the application in question<br />
and must be optimized during start-up.<br />
The soft starter dimensions should be checked where necessary<br />
with the Win-Soft Starter software or with the help of Technical<br />
Assistance.<br />
1) Actual motor starting times are load dependent.<br />
17-218<br />
Siemens Industry, Inc. SPEEDFAX Product Catalog
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