Motor soft starter fault check method

- Jul 16, 2019-

The maggot meter measures the resistance value of the main circuit 3 inputs to the housing and phase-to-phase, normal is infinity, the resistance value between the input and output end of each phase is measured greater than 100M normal, and then power up, the display has no fault alarm.

1. In the commissioning process, there is a failure of the starting report, soft starter fault light, the motor did not respond.

The cause of the failure may be:

(1) When the starting mode is carried, the order of operation is incorrect. (The correct order of operation should be to send the main power supply first, and then the control power supply should be sent back

(2) Power supply is out of phase, soft starter protection action. (Check the power supply)

(3) The output end of the soft starter is missed the load. (Soft starter sits only after output is terminated on load)

2. the user in the process of use of the start-up, bypass contactor sucking phenomenon.

The cause of the failure may be:

(1) During the start-up process, the protective device has mis-action due to the small ness of the fixation. (Re-fix the protection)

(2) In debugging, the parameters of the soft starter are not set properly.

(Primarily for soft starters below 55KW, re-set to the parameters of the soft starter)

(3) Poor contact of the control line. (Check control line)

3. the user in the starting process, there are occasional air-jumping switch phenomenon.

The causes of the failure are:

(1) The calibration value of the air switch for long delay is too small or the air switch selection and motor is not matched.

(The parameters of the air switch are moderately magnified or the air switch is re-selected)

(2) The starting voltage parameters of the soft starter are set too high or the starting time is too long. (The starting voltage is appropriately reduced or the starting time is appropriately reduced depending on the load)

(3) In the starting process due to the power grid voltage fluctuations are relatively large, easy to cause the soft starter to issue the wrong instructions, the phenomenon of advance bypass.(It is recommended that the user do not start high-power motors at the same time)

(4) Full load start-up at start-up. (Minimize load at start-up)

4. the user in the use of soft starter when the display does not show or appear garbled code, soft starter does not work.

The cause of the failure may be:

(1) The vibration caused by the external componentduring of the soft starter during the use of the soft starter makes the internal connection of the soft starter loose. (Open the face cover of the soft starter and plug the display line back into it)

(2) Soft starter control board failure. (Contact the manufacturer to replace the control board)

5. soft starter in the starttime fault, soft starter does not work, the motor does not respond.

The cause of the failure may be:

(1) The motor is out of phase. (Check the motor and peripheral circuits)

(2) The main component of the soft starter, The scrare is shorted. (Check the motor and the grid voltage for anomalies. Contact the manufacturer to replace The SCR)

 (3) The filter plate breaks through the short circuit. (Replace the filter plate)

6. soft starter in the starting load, the starting time-out phenomenon. The soft starter stops working and the motor stops freely.

The causes of the failure are:

(1) The parameter setting is unreasonable.

(Re-adjusting the parameters, the starting voltage is appropriately raised, the time is appropriately lengthened)

(2) Full load start-up at start-up. (The load should be reduced as much as possible when starting)

7. in the start-up process, the current is unstable, the current is too large.

Possible reasons may be:

(1) The current meter indicates that it is inaccurate or does not match the transformer. (Replace a new current meter)

(2) The voltage of the power grid is unstable and the fluctuation is relatively large, which causes the soft starter to act incorrectly.(Contact the manufacturer to replace the control board)

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

8. soft starter appears repeated start.

The causes of the failure are:

(1) In the starting process peripheral protection element action, contactor can not suck up, resulting in a repeated start of the soft starter. (Check peripheral components and wiring)

9. in the start-up of the overheating fault light is on, the soft starter stops working:

(1) Frequent starting, resulting in excessive temperature, causing the soft starter overheatprotection action.(Soft starter starting number to be controlled no more than 6 times per hour, especially heavy load must pay attention)

(2) In the starting process, protect the component action, so that the contactor can not bypass, soft starter long-term work, causing protection action. (Check peripheral circuits)

(3) Too long load start time causes overheating protection. (Reduce the load as much as possible when starting)

(4) The parameters of the soft starter are not adjusted properly. The time is too long and the starting voltage is too low. (Raise the starting voltage)

(5) The cooling fan of the soft starter is damaged and does not work properly. (Replace fan)

10. SCR damage:

 (1) When the motor is started, the overcurrent knocks the soft starter through. (Check that the power of the soft starter matches the power of the motor and whether the motor is mounted)

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

(3) Frequent starting, high temperature will be damaged silicon. (Control the number of starts)

(4) Filter plate damage (replacement of damaged components) input lack of phase, causing this fault has many factors: check the inbound power supply and motor inlet line is loose, the output is connected to the load, the load and the motor match, the use of a universal table to detect the soft starter module or Scritlise silicon break- and their trigger gate pole resistance Meets the requirements of normal conditions (usually around 20-30 euros);

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