Direct starting of the engine is a shock: high current and a sharp jerk. Soft start eliminates these problems. Let's figure out why it is needed and when it is needed.
What happens during direct starting
- The starting current is 5-7 times higher than the nominal - network sag.
- A sharp mechanical shock to the mechanism and coupling.
- Thermal shock to the winding.
Frequent heavy starts accelerate wear and lead to rewind.
What gives a soft start
| Effect | Benefit |
|---|---|
| Reduced starting current | No network sag |
| Smooth acceleration | No shock to the mechanism |
| Less heating | Winding life |
| Protection | Built-in control |
When necessary
- Mechanisms with high inertia (fans, crushers).
- Equipment with frequent starts (conveyors, pumps).
- Weak networks, where subsidence during start-up is critical.
- Mechanisms sensitive to shock (belts, couplings).
Soft start is realized by a soft start device (SPD) or frequency converter. It pays off by reducing accident rates and extending service life. More details about the choice can be found in the material about starting equipment.
Do you want to reduce starting loads on engines in Tashkent? Elektromotors engineers will find a solution - leave a request.