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Common faults and solutions of soft starters-Part 2

Sep 09, 2020

Common faults and solutions of soft starters-Part 2


6. When the soft starter starts the load, the start-up timeout occurs. The soft starter stops working and the motor stops freely. The reasons for the failure are:

 ① The parameter setting is unreasonable. (Re-tuning the parameters, the initial voltage is appropriately increased, and the time is appropriately lengthened)  ② It starts at full load when starting. (The load should be reduced as much as possible when starting)

7. During the startup process, the current is unstable and the current is too large. The reasons may be:

 ① The indication of the ammeter is not accurate or does not match the transformer. (Replace with a new ammeter)

 ② The grid voltage is unstable and the fluctuation is relatively large, causing the soft starter to malfunction. (Contact the manufacturer to replace the control board)

 ③ The soft starter parameter setting is unreasonable. (Re-tuning parameters)

8. The soft starter appears to be restarted repeatedly. The reasons for the failure are:

 ① During the start-up process, the peripheral protection components acted, and the contactor could not be closed, causing the soft starter to repeatedly start. (Check peripheral components and wiring)

9. The overheating fault light is on when starting, and the soft starter stops working:

 ① Frequent start-ups result in excessively high temperature and cause the soft starter to overheat protection. (The number of starts of the soft starter should be controlled not to exceed 6 times per hour, especially for heavy loads.)

 ② During the start-up process, the protective element acts to prevent the contactor from bypassing, and the soft starter works for a long time, causing the protective action. (Check the peripheral circuit)

 ③ Overheating protection caused by overloading and starting time is too long. (When starting, reduce the load as much as possible)

 ④ The parameter setting of the soft starter is unreasonable. The time is too long and the starting voltage is too low. (Increase the starting voltage)

 ⑤ The cooling fan of the soft starter is damaged and cannot work normally. (Replace the fan)

10. SCR damage:

 ① When the motor is starting, overcurrent will break down the soft starter. (Check whether the power of the soft starter matches the power of the motor, and whether the motor is started with load)

 ② The cooling fan of the soft starter is damaged. (Replace the fan)

 ③ Frequent startup and high temperature will damage the SCR. (Control the number of starts)

 ④ The filter board is damaged (replace the damaged component) Input phase is missing, and there are many factors that cause this failure:

  - Check whether the incoming power supply and motor incoming wires are loose;

  - Whether the output is connected to a load, and whether the load matches the motor;

  - Use a multimeter to check whether the soft starter's module or SCR is broken down, and whether their trigger gate resistance meets the requirements under normal conditions (usually around 20-30 ohms);

-Whether the internal wiring socket is loose.

All in all, when using the soft starter, you must follow, be safe and cautious, carefully read the product manual and installation instructions, and have a sufficient understanding of the environment, in order to have a better use experience during use.

The SAFESAVE soft starter SJR3 series adopts a general soft start structure, with universal applicability and good quality, and can adapt to the use environment under various conditions. Welcome to consult.