Reasons and Solutions for the Failure of an Electric Motor to Start Up

I. Reasons for the Failure of an Electric Motor to Start Up

1. Phase loss of the power supply (one or two-phase fuses are blown);
2. Open circuit in the stator or rotor winding;
3. Inter-phase short circuit, grounding or incorrect wiring of the stator winding;
4. The setting value of the thermal relay is too small, the knife switch is not properly closed, or the switch mechanism fails and cannot be closed;
5. Open circuit in the control circuit, the control fuse is blown, and whether the thermal contacts are switched normally;
6. Excessive load or the machinery is jammed;
7. The bearing is damaged or jammed;
8. The water pump or the fan is rotating in the reverse direction.

II. Solutions for the Failure of an Electric Motor to Start Up

1. Check whether the operation and closing fuses are blown and whether the contacts are in good condition;
2. Check whether the electrical and thermal protection devices have been activated;
3. Check whether the trolley switch is in the proper position;
4. Measure whether the insulation resistance is qualified after cutting off the power;
5. Conduct a manual barring test to check that the mechanical part is in good condition and there is no jamming phenomenon;
6. Check that the outlet gate of the water pump and the outlet damper of the fan should be in the closed position;
7. After checking and dealing with the problems, conduct a starting test again, and pay attention to the number of starting attempts;
8. If the motor still cannot be started after inspection and handling, promptly notify the maintenance personnel for inspection and handling.