FANUC fanuc servo motor, fanuc spindle motor Common faults causes&Solution

Faults description	Causes	Solutions
1. Overheating	Motor is overloaded	Check and adjust the load
	Poor cooling (e.g., blocked heat sinks or high ambient temperature)	Clean heat sinks and improve ventilation
	Supply voltage is too high or too low	Verify if the supply voltage is correct
	Internal motor issues (e.g., winding short circuits)	Inspect and repair internal motor faults
2. Abnormal Noise and Vibration	Bearing damage or poor lubrication	Replace or lubricate the bearings
	Rotor imbalance or rotor rubbing against the stator	Check rotor balance and fix rubbing issues
	Unstable installation or uneven foundation	Ensure the base is secure and stable
	Loose parts inside the motor	Inspect for loose components inside the motor
3. Difficulty Starting or Failure to Start	Power supply issues (e.g., low voltage, phase failure)	Check power supply voltage and connections
	Start capacitor or start winding failure (for single-phase motors)	Replace the start capacitor or check the start winding
	Overloaded or mechanical blockage	Reduce the load or clear mechanical obstructions
	Control circuit fault	Inspect and repair control circuit components

4. Excessive Current During Operation	Overloaded or excessive mechanical resistance	Adjust the load or check the mechanical system
	Internal motor short circuits or winding faults	Repair motor windings
	Abnormal supply voltage	Check the supply voltage
	Motor and load mismatch	Select a motor that matches the load
5. Insulation Aging or Damage	Long-term use leading to insulation material aging	Regularly inspect the motor’s insulation condition
	Harsh environmental conditions (e.g., high humidity, chemical corrosion)	Improve the operating environment to prevent moisture and corrosion
	Motor overheating causing insulation breakdown	Avoid motor overloading to prevent overheating
6. Motor Fails to Brake	Brake failure or wear	Inspect and replace the brake
	Control circuit malfunction	Repair the control circuit
	Brake power supply issues	Check if the brake power supply is functioning correctly

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Repair Service

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FANUC Repair Process

How we process your repair requirements

Step 1: Contact Us:

Get in touch with us and provide as much detail as possible about the issue you are experiencing.

Step 2: Preliminary Assessment

Our professional repair team will help assess the severity of the problem and the possibility of repair.

Step 3: Send and Register

If the fault is likely repairable, we will provide an initial quote and arrange for logistics to collect the item.
If the fault is difficult to repair, we will suggest replacing the parts and offer a special discount quote for your reference.

Step 4: Initial Quote and Logistics

The customer sends or delivers the servo drive to our company. We register it in our system and prepare it for further inspection.

Step 5: Diagnose Fault

Our engineers diagnose the fault points of the servo drive and provide a detailed inspection report, including the final repair cost and estimated repair time.

Step 6: Confirm Repair

We provide the repair quote to the customer and wait for their confirmation. If the customer agrees to the quote, we proceed with the repair.

Step 7: Perform Repair and Testing

Upon customer approval, we carry out the necessary repairs. After repairs are completed, we perform tests with the motor and conduct aging tests to ensure the servo drive operates reliably under various conditions. Once the testing is successful, we register the drive for delivery.

Step 8: Customer Payment and Delivery

The customer completes the payment, and we deliver the repaired servo drive to the customer.

Step 9: Follow-Up Service

We provide attentive follow-up service to ensure customer satisfaction and address any further needs.