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Home » Motor protection » Motor trips 4 to 6 times a day
Motor trips 4 to 6 times a day
Whenever we want to start up the motor, it will trip from 4 to 6 times. There is a need to redesign the electrical system start from MCC and motor selection. Our field (mechanical) engineer found out that, there is not enough torque which is the main reason it tripping.
Following your comments 'whenever we want to start up the motor, it will trip from 4 to 6 times.' - The most likely cause of the problem will relate to the Shunt trip contacts on the breaker terminals closing due to shorted SCR in the reduce voltage starter. Did you perform SCR check? or it could be as simple as one of the three phase incoming line loose. If so, switch two incoming line and the corresponding motor leads to maintain motor rotation.
Your comments "Our field (mechanical) engineer found out that, there is not enough torque which is the main reason it tripping." The most likely cause of the problem of insufficient Torque would be: Improper current feedback - check current feedback resistor for correct calibration. The other possibility could be High break away torque required. See pulse start application where large break away torque is required to start the motor.
If the overload relay trips when starting - you may have to check heater coils rating. Long starting time, single phasing or current limit may be set too low.
Lastly, the bottom line is the load is not suitable for reduced voltage starting. Have your engineer look at the application.
A high-kW motor always has a space heater to prevent accumulated moisture inside due to a temperature change
- According to my personal experience, at 415V, a motor could be run at very low insulation resistance that one can believe, i.e. at 0.5 M-Ohm without any trip by ground fault protection. Moreover, failure of winding insulation that causes a trip of the motor will lead to permanent damage of winding insulation and also carbonization. Consequently, the motor could not be started anymore without repairing.
Following your comments 'whenever we want to start up the motor, it will trip from 4 to 6 times.' - The most likely cause of the problem will relate to the Shunt trip contacts on the breaker terminals closing due to shorted SCR in the reduce voltage starter. Did you perform SCR check? or it could be as simple as one of the three phase incoming line loose. If so, switch two incoming line and the corresponding motor leads to maintain motor rotation.
Your comments "Our field (mechanical) engineer found out that, there is not enough torque which is the main reason it tripping." The most likely cause of the problem of insufficient Torque would be: Improper current feedback - check current feedback resistor for correct calibration. The other possibility could be High break away torque required. See pulse start application where large break away torque is required to start the motor.
If the overload relay trips when starting - you may have to check heater coils rating. Long starting time, single phasing or current limit may be set too low.
Lastly, the bottom line is the load is not suitable for reduced voltage starting. Have your engineer look at the application.
A high-kW motor always has a space heater to prevent accumulated moisture inside due to a temperature change
- According to my personal experience, at 415V, a motor could be run at very low insulation resistance that one can believe, i.e. at 0.5 M-Ohm without any trip by ground fault protection. Moreover, failure of winding insulation that causes a trip of the motor will lead to permanent damage of winding insulation and also carbonization. Consequently, the motor could not be started anymore without repairing.
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