How to correct the wrong direction of the motor of BWED53-187-5.5KW cycloid reducer

BWED53-187-5.5KW is a medium-power two-stage horizontal cycloidal pinwheel reducer. Motor steering errors must be corrected by following the process of 'stop inspection → power off operation → phase sequence adjustment → steering verification → load review' to avoid blind operation and damage to the equipment. The specific steps are as follows:

1. Emergency shutdown and safety confirmation

After discovering the steering error, immediately press the emergency stop button to cut off the motor power, and it is strictly prohibited to continue running; wait until the reducer and motor have completely stopped (it takes 5-10 minutes to ensure that the inertia is completely eliminated) before carrying out subsequent operations.

Check the connection status between the reducer and the load equipment: If it is rigidly connected, the coupling or transmission parts need to be removed to avoid damage to the reducer due to reverse impact of the load-side equipment when correcting the steering.

Visually inspect the appearance of the reducer: Check whether the anchor bolts are loose, whether the oil seal is leaking, and whether there is any abnormal noise in the housing. It is initially judged that the steering error has not caused obvious component damage.

2. Power off and terminal preparation

Tag and lock the motor junction box to prevent others from accidentally closing it; use a test pen to confirm that there is no voltage at the terminal to ensure safe operation.

Open the motor junction box, clean the dust and oil in the box, find the terminals of the three-phase power cord (usually marked U, V, W), and record the current wiring method (for reference in subsequent restoration).

3. Adjust the phase sequence of the three-phase power supply (core step)

This model is mostly equipped with three-phase asynchronous motors. The steering direction is determined by the phase sequence of the power supply. The steering direction can be changed by arbitrarily changing the wiring positions of the two power cords.

Operation method: Loosen the fastening screws on the terminal block, remove any two of the three-phase U, V, and W cables (such as U phase and V phase) and reconnect them in interchange positions. Tighten the screws to ensure good contact and avoid virtual connection and heat generation.

Note: It is strictly prohibited to modify the internal winding wiring of the motor. Only adjust the phase sequence of the external three-phase power cord. After the wiring is completed, cover and lock the junction box and remove surrounding debris.

4. Jog to verify whether the steering is correct

Restore the power supply (keep the load end disconnected), use the inching power-on method (press the start button and release immediately, power-on time ≤ 2 seconds), and observe the rotation of the reducer output shaft.

Compare the specified rotation marked in the equipment manual (usually facing the end face of the output shaft, clockwise/counterclockwise rotation as the standard). If the output shaft rotation is consistent with the regulations, it is initially determined that the phase sequence adjustment is successful.

Repeat jogging 2-3 times to confirm that the steering is stable and without fluctuations to avoid misjudgment caused by poor power contact.

5. No-load trial operation and status inspection

Operation noise: no obvious metal impact or whistling sound, noise value ≤75dB (measured 1m away from the equipment);

Bearing temperature: temperature rise ≤40℃, maximum temperature ≤80℃, no sharp temperature rise;

Sealing status: There is no oil leakage from the oil seals at the output shaft end and motor end, and there is no relative displacement between the machine base and the foundation.

After the steering is correct, conduct a 5-10 minute no-load test run, during which three key indicators will be monitored:

After the trial run, stop the machine and use a torque wrench to recheck the anchor bolt torque to confirm that there is no attenuation; at the same time, manually turn the output shaft to check whether the rotation is flexible and free of jamming.

6. Load side connection and final review

Reconnect the coupling between the reducer and the load equipment to ensure that the coaxiality reaches the standard (radial runout ≤ 0.04mm, axial runout ≤ 0.03mm), tighten the coupling bolts and install an anti-loosening device.

Carry out a load test run for 15-20 minutes to observe whether the running direction of the load-side equipment meets the process requirements. At the same time, monitor the reducer current, vibration, and oil temperature. If there is no abnormality, the correction is completed.