How to set parameters of soft starter

If the initial voltage is too small, the motor will only buzz when the soft starter starts the motor, but the motor will not rotate. This means that the torque is too small, the initial voltage is too large, and the soft starter starts the motor too hard, which loses the soft start effect. Therefore, the initial voltage should be appropriately modified according to the load. The current limiting multiple refers to the instantaneous current controlled within the multiple of the rated current when the motor is started.

Most soft starters have adjustable initial voltage. Since the initial voltage determines the initial torque, the initial voltage is set according to the load torque. If it is set too low, the soft starter cannot start or the starting time is too long. If it is set too high, the starting voltage will cause mechanical shock and the starting current will be too large. For no-load starting, the starting voltage should be set to 10%-15% of the rated voltage. For medium-load and heavy-load starting, the starting voltage can be set to 40%-70% of the rated voltage.

Start time and stop time settings: The start time is usually set at around 10 seconds, and the stop time is usually set within 20 seconds.

The soft starter parameter settings need to be selected according to the motor parameters and actual conditions. The following are some common soft starter parameters and their setting methods:

1. Starting voltage: The starting voltage is the starting value of the soft starter output voltage. Setting a reasonable starting voltage can avoid the problem of excessive current when the motor starts. Usually, the starting voltage can be set to about 50% of the rated voltage of the motor.

2. Acceleration time: The acceleration time refers to the time required for the motor to accelerate from the starting voltage to the rated voltage. Generally, the acceleration time needs to be set taking into account the motor inertia, load characteristics, and the transmission mechanism being used. Too short an acceleration time will result in excessive motor load and large voltage fluctuations, while too long an acceleration time will extend the startup time and energy consumption. Generally, the acceleration time can be set to 1-60 seconds, depending on the situation.

3. Deceleration time: Deceleration time refers to the time required for the motor to stop completely from stopping. Usually, the deceleration time needs to be set according to the requirements of the equipment and safety considerations, and can generally be set to about 1-60 seconds.

4. Stop current: The stop current is the current that the soft starter can continue to control the motor to complete deceleration and stop after the motor power is turned off. Generally, the setting of the stop current needs to be selected according to the characteristics of the motor. Properly increasing the stop current is conducive to controlling the stability of the motor speed and reducing the inertia impact of the equipment.

5. Overcurrent protection: Overcurrent protection is a protection mechanism of the soft starter, which is used to protect the motor from excessive current and damage during operation. Normally, the overcurrent protection can be set to about 125% of the rated current of the motor.

In short, the setting of soft starter parameters needs to take into account the characteristics of the motor, the use environment and actual needs, and needs to be adjusted and improved through actual testing and optimization. For users who are not familiar with soft starter debugging, it is recommended to seek help from professionals or related equipment manufacturers.