The S2-400 and S3-400 softstarters are a low-cost starter solution for drives with a light start-up behavior. The integrated current control allows a constant adjustable starting current during the start-up phase. Additional highlights are the simple integration without additional control inputs and network-side rotating field monitoring.
- Uncomparable linear ramp-up
- Unbeatable price in this performance class
- Softstarter with low system pertubartion
- Material-friendly smooth motor start
- Initial current reduction
- Integrated bypass contacts
- Adjustable ramp-up time
- Replacement for Start-delta-starters
- Two-phase controlled
- Kick-start function
- Rotary field- and phase failure detection (during closure)
- Current control optional
- Connection with spring-type terminals
|Image||Capacity||Designation||Description||Art.-No.||Price incl. VAT|
|3.0 - 7.5 kW||S3-400-3.0-7.5||Setting "Constant current" or "Moment / Time" possible||8700.0140|| |
€ 151,96 Order
Asynchronous motors are usually started either directly or with a star-delta circuit. A direct start can cause extremely high initial currents up to seven times higher then the rated motor current. The star-delta circuit mitigates this problem by a lower phase voltage with factor square root 3. However, switching from star to delta causes a considerable current peak. These starting modes may overload the electricity supply network, interfere with other consumers, cause mechanical problems and subject the entire drive to severe wear.
The solution for this problem is a softstarter. During start-up, the starter reduces the voltage in two of the three phases by means of phase control. During the adjustable ramp-up time the torque increases slowly until the full network voltage is applied to the motor. This results in a smooth start-up of your motor that protects both the electricity supply network and the drive. Extremely robust thyristor pairs (connected in anti-parallel) serve as switching elements.
The adjustment potentiometers set the ramp-up time and the starting torque.
With the jumper you activate the Kickstart (only S1 and S2), if a high breakaway torque is needed. After the motor has started up, the controller switches the integrated bypass relays so that no heat loss occurs during operation.
For softstarters with current control the user sets only the desired current and thus the starting torque. The ramp-up time results from the load ratios. Should the current be insufficient to start the motor, the starter will abort the start-up attempt automatically after 30 seconds to prevent overheating.
Please note that for small voltages the torque of the asynchronous motor decreases by the square. The softstarter is therefore not suitable for drives that require a high starting torque. In this case we recommend to use frequency inverters as starters which are also part of our product portfolio.
|Voltage||400 V +10 % ... -15 % (Special voltage on request)|
|Frequency||45-63 Hz, no generator operation|
|Rated current||16.0 Aeff|
|Motor power||Up to 7.5 kW|
|Kickstart function (only S1 and S2)||Up to 5.5 kW - activatable by jumper|
For heavy-duty start-up with high static friction the motor is actuated for approx. 120 ms with a very high torque.
|Operation mode display||LED bicolour|
|Adjustable start ramp||3 ... 15 s (S1 and S3 without current control)|
|Adjustable initial torque||0 ... 100 % (version S2 and S3: 8 ... 40 A)|
|Ready for restart after||Approx. 300 ms|
|Max. frequency of operation||2x Ie - 10 s 60/h Tu=25° C|
3x Ie - 10 s 30/h Tu=25° C
|Pre-fuse||16 A gL|
|Connection||Wago Spring-type terminal|
|Stripping length||8-9 mm|
|Diameter||0.08 - 4.0 mm² single-wire|
0.25 - 2.5 mm² finely stranded with AEH
|Ambient temperature||0° C ... +40° C|
|Storage temperature||-20° C ... +75° C|
|Dimensions||65x107x103 mm (WxLxD)|
- Conveyor band
- And much more
Not suitable for heavy-duty start-up such as Compressors.
Solutions for this purpose see ABB PSR series (please select 1-2 performance classes higher)