What Should Be Paid Attention to when Using the Soft Starter?

When using a soft starter, we can use several simple methods to detect whether it is good or bad, such as visual inspection, sniffing and listening. Listening means that if the soft starter has any abnormal sound, stop it immediately and then perform maintenance. In order to avoid damage to the soft starter, when using it, we must pay attention to the installation and maintenance of the soft starter by qualified professionals, and it is strictly forbidden to use high-voltage testing equipment (such as a megger) to test the insulation of the soft starter, etc. , how to measure the quality of the specific soft starter and what precautions should be taken when using the soft starter, let’s take a closer look in the text!

How does the soft starter measure good or bad?

1. First visual inspection
Through visual inspection, you can observe whether the soft starter has the following phenomena: The soft starter is strongly damaged, and the damage is usually caused by collision, fire, water ingress, dust, load short circuit
Treatment: It can be sent back to the manufacturer for repair according to the damage.
2. The second step of sniffing
Regardless of whether the soft starter body is burned or not, the damage is usually caused by excessive current or excessive load.
Treatment: It can be sent back to the manufacturer for repair according to the damage.
3. The third step is to listen
If the soft starter makes any abnormal sound, stop it immediately. Do not connect power factor correction capacitors to the starter output.

2. What should be paid attention to when using the soft starter?

1. The installation and maintenance of the soft starter must be carried out by qualified professionals
2. It is strictly forbidden to use high-voltage testing equipment (such as megger) to test the insulation of the soft starter.
3. If the motor is required to run reversibly, a reverse contactor can be installed on the incoming line side, and be careful not to install it on the output side of the soft starter
4. After the rotor of the linear motor is connected in series with an appropriate starter resistor to increase the starting torque, the soft starter can also be used to start the linear motor. When the motor reaches
After full speed and stabilization, the starting resistor should be bypassed to reduce power loss. 5. It is strictly forbidden to place the power factor compensation capacitor on the output side of the soft starter, and the capacitor cannot be switched during starting. The soft starter itself has no short-circuit protection, in order to protect the thyristor, a fast fuse should be used. The fast fuse should be selected according to the rated current of the soft starter6. It should be pointed out that due to the long breaking time of the low-voltage circuit breaker (about 0.1S), it is not suitable for the protection of crystal transistors.
7. When the soft starter uses the motor brake to stop, it is only because the transistor is not conducting and the input voltage of the motor is 0V, but there is no electrical isolation between the motor and the power supply, so when repairing the motor or circuit , the power supply must be cut off. For this reason, a breaker circuit should be added between the soft starter and the power supply.
8. When the power of the soft starter is large or the number of units is large, the high-order harmonics generated will cause adverse effects on the power grid and interfere with electronic equipment. For this reason, a bypass contactor can be installed in the starting circuit of the motor. When the motor starts smoothly to normal speed, the bypass contactor is closed and the soft starter is shorted. That is, after the start-up is completed, the high-power thyristor will no longer work, thereby eliminating the interference of high-order harmonics to the power grid and electronic equipment.
9. The soft starter has a variety of built-in protection functions (such as stall and stall test, phase balance, underload protection, undervoltage protection, overvoltage protection, etc.), and the protection function should be selected by editing according to actual needs or Disable certain protective functions. For example, in the case where the loss caused by sudden power failure is greater than that caused by overload, the overload protection should act on the bead signal instead of cutting off the circuit.
10. The operating environment of the soft starter has relatively high requirements. Ventilation and heat dissipation should be done well. When installing, a certain space should be left above and below it to allow air to flow through its power module. When the rated current of the soft starter is large, a fan should be used to cool down.