What problems are prevented using soft starters?

What are the main effects of using soft start on the motor?

1. If it is a direct control circuit without a bypass contactor; the soft starter can protect the motor from various working conditions.

2. Overload protection: When the motor is overloaded and causes overload, the soft starter will detect the motor overcurrent and overheating, thereby automatically shutting down and stopping the output voltage. If the fault is not resolved, it will remain in that state. The protection state prevents startup. At this time, everyone should not mistakenly think that the soft starter is faulty (especially electrician beginners and electrician enthusiasts)!

3. Short circuit protection: If there is a short circuit in the line, it will automatically shut down.

4. Under voltage protection

5. Voltage mismatch and phase loss protection: Under voltage: the voltage drops a lot; if the voltage exceeds 5%, the motor cannot work. In the case of under voltage, if the motor is forced to run, it will burn. Bad motor.

6. Reduce the sudden increase in current when the equipment is started.

During soft start, the starting current is generally 2 to 3 times the rated current, and the grid voltage fluctuation rate is generally within 10%, which has very little impact on other equipment.

7. Eliminate harm to the power grid

The impact of the large current directly started by the super large motor on the power grid is almost similar to the impact of a three-phase short circuit on the power grid. It often causes power oscillation and makes the power grid lose stability. The starting current is greatly reduced during soft start, and the above effects can be completely avoided.

8. Reduce damage to electrical equipment

The starting torque during full-voltage direct starting is about twice the rated torque. Such a large torque suddenly added to stationary mechanical equipment will accelerate gear wear and even toothing, accelerate belt wear and even break the belt, and accelerate the fan blades. Fatigue or even broken blades, etc., the impact of soft starting torque will not exceed the rated torque and can be completely eliminated.