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Soft Starter for 3-phase motors up to 7.5 kW
The alternative to star-delta-starters
Soft starter in top-hat rail case
Soft starter in case K4000
see example combinations too
Special features:
- Gentle start-up with little impact on the electricity supply network
- Jerk-free motor start protects material
- Reduces start-up current
- Integrated Bypass contacts
- Adjustable ramp-up time
- Replaces classic star-delta-starters
- Two-phase controlled
- Kick-start function
- Detects rotational field and phase drop-out (when switches on)
- Optional current control
- Connected with spring clamp terminals
For use in:
- Pumps, fans, saws, conveyer belts, centrifuges, band saws, etc.
Technischal data:
Designation/Modell.No.:
| Capacity | Designation |
Mod.No. |
Note |
|---|---|---|---|
| 3.0 kW | S1-400-3,0 |
8700.0130 |
without current control, requires setting of ramp-up time |
S2-400-3,0 |
8700.0131 |
current controlled, with current limiter |
|
| 4.0 kW | S1-400-4,0 |
8700.0132 |
without current control, requires setting of ramp-up time |
S2-400-4,0 |
8700.0133 |
current controlled, with current limiter |
|
| 5.5 kW | S1-400-5,5 |
8700.0134 |
without current control, requires setting of ramp-up time |
S2-400-5,5 |
8700.0135 |
current controlled, with current limiter |
|
| 7.5 kW | S1-400-7,5 |
8700.0136 |
without current control, requires setting of ramp-up time |
S2-400-7,5 |
8700.0137 |
current controlled, with current limiter |
furter data:
- Voltage
- 400 V +10 % ... -15 % (other voltages on request)
- Frequency
- 50 Hz (60 Hz on request), no generator use
- Nominal voltage
- 16.0 Aeff
- Motor capacity
- up to 7.5 kW
- Kick-start function
- up to 5.5 kW -to activate with jumper.
For heavy-duty start-up with high static friction the motor is actuated for approx. 120 ms with a very high torque. - Operation display
- bicolored LED
- Adjustable start-up ramp
- 3 ... 15 sec (only for version S1 without current control)
- Adjustable start-up torque
- 0 ... 100 %
- Ready for restart after
- approx. 300 ms
- Switching capacity max.
- for 2x Ie - 10 sec. 60/h Tu=25 °C
for 3x Ie - 10 sec. 30/h Tu=25 °C - Control of seminconductors
- excess temperature shutdown
- Back-up fuse
- 16 A gL
- Connection
- Wago spring clamp terminal
- Stripping length
- 8-9 mm
- Diameter
- 0.08 - 4.0mm² single-core
28-12 AWG
0.25 - 2.5 mm² fine-strand with ferrule - Material
- Case: PA6-GF30-V0
Cover: PA6-GF10-V0 - Ambient temperatur
- 0 °C ... +40 °C
- Storage temperature
- -20 °C ... +75 °C
- Weight
- S1-400-7,5 = 405 g
S2-400-7,5 = 435 g - Dimensions
- 65 x 107 x 103 mm (LxWxH)
Dimension drawing [pdf-File]
Use in series
Control panel, connections and LED-display
Explanation of connections and functions[pdf-File]
Circuit diagram [pdf-File]
Start-up diagramm [pdf-File]
Functional description:
Asynchronous motors are frequently started either directly or by means of a star-delta circuit. A direct start evokes extremely high start-up currents of up to seven times the nominal motor current. The star-delta circuit mitigates this problem; the phase voltage is reduced by a factor of square root of 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 to 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 jerk-free 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.
When a high breakaway torque is required, activate the kick-start by means of the jumper. When the motor has reached the desired speed, the control unit will actuate the bypass relays to prevent heat loss 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.