What should you do if the elevator door operator motor won’t start or is running at an abnormal speed?

When the elevator door operator motor fails to start or exhibits abnormal speed, refer to the following troubleshooting and handling methods:

1. The elevator door operator motor fails to start.

1. Check the power supply and electrical connections

   • Confirm whether the power voltage is normal and check for any voltage drops or abnormal power frequency.

   • Check that the motor wiring is correct, including ensuring the phase sequence is accurate, to prevent the motor from failing to start due to incorrect connections.

   • Check whether the signal inputs on the control panel are functioning properly, such as verifying if the door-opening command signal is valid at low voltage.

2. Inspect the motor itself

   • Use a megohmmeter or multimeter to test the insulation resistance and continuity of the motor windings, and check for any turn-to-turn shorts or ground faults in the windings.

   • Check whether the motor rotor is functioning properly, such as verifying if the rotor bars are intact and ensuring that the air gap between the rotor and stator is uniform.

   • Check the motor bearings for wear or stiffness, and replace them if necessary.

3. Inspect mechanical components

   • Check the elevator door machine's mechanical transmission system for any malfunctions, such as whether the belt is too tight or slipping, or if the coupling is misaligned.

   • Check if the elevator doors are stuck or encountering mechanical resistance, and rule out any instances of mechanical jamming.

4. Check the control system

   • Check whether the gantry crane controller is functioning properly, including verifying that the signal inputs and outputs on the control board are working as expected.

   • Check whether the encoder signal is functioning properly; if the signal is missing or erratic, replace the rotary encoder promptly.

5. Check the brake.

   • Check whether the brake is releasing properly; if the brake doesn’t open correctly, the motor may fail to start.

2. Abnormal motor speed of the elevator door opener

1. Check the power supply and electrical connections

   • Ensure the power supply voltage is stable, as insufficient voltage can cause the motor speed to drop.

   • Check whether the motor wiring is correct to prevent abnormal speed caused by wiring errors.

2. Inspect the motor itself

   • Check the motor windings for short circuits or open circuits, as these can affect the motor's speed.

   • Check if the rotor is functioning properly, as broken rotor bars or eccentricity can lead to abnormal rotational speed.

3. Check the control system

   • Check whether the parameter settings of the door operator controller are correct, such as whether the speed loop and current loop settings are reasonable.

   • Check whether the encoder signal is functioning properly, as a faulty encoder can lead to abnormal motor speed control.

4. Check the mechanical load

   • Check whether the mechanical load on the elevator door mechanism is excessive; if the load exceeds the motor’s rated capacity, it will cause the speed to drop.

   • Check the mechanical transmission system for any faults, such as belt slippage or misaligned couplings.

III. Other Important Notes

• When troubleshooting, ensure the elevator is in a safe condition to prevent injuries to personnel or damage to equipment.

• If the issue cannot be resolved on your own, it is recommended to contact a professional elevator technician for inspection and repair.