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Access Parameter Settings

Navigate to the parameter screen on the Fanuc control (typically under SYSTEM > PARAMETERS) to locate the motor type settings for the affected axis (e.g., parameter numbers in the 2000 series for motor type).

Take a photo of the current settings before making changes for reference in case of errors.

Ensure the machine is powered down or in a safe mode before accessing parameters to avoid accidental motion.

Verify Motor Model on Nameplate

Physically inspect the motor on the affected axis and note the model number on the nameplate. Cross-reference this with the Fanuc motor type parameter (refer to the Fanuc manual for motor type codes).

Use a flashlight to read small or obscured nameplate text on the motor housing.

Do not touch live components while inspecting hardware; ensure proper lockout/tagout procedures are followed.

Update Motor Parameter if Mismatched

If the parameter does not match the motor nameplate, update the parameter to the correct motor type code as per the Fanuc manual. Save changes and cycle power to the control.

Double-check the entered value against the manual to avoid typographical errors.

Incorrect parameter settings can cause unexpected machine behavior; test in a controlled environment after changes.

Locate Amplifier Parameter Settings

Access the amplifier type settings in the Fanuc control parameters (often in the same 2000 series or specific amplifier-related parameters as per the manual). Note the current setting for the affected axis.

Document all related parameters for the axis to ensure no other settings are overlooked.

Avoid changing unrelated parameters to prevent additional alarms or issues.

Inspect Amplifier Nameplate

Check the physical amplifier connected to the affected axis for its model number on the nameplate. Compare this with the parameter setting using the Fanuc amplifier type codes.

Amplifiers are often located in the control cabinet; ensure proper lighting to read labels.

High voltage may be present in the control cabinet; follow safety protocols and wear appropriate PPE.

Correct Amplifier Parameter if Necessary

If a mismatch is found, update the amplifier type parameter to match the installed hardware as per the Fanuc manual. Save the changes and power cycle the machine to apply settings.

Verify the parameter update with a second check to avoid input errors.

Test machine operation at low speed after changes to ensure stability.

Compare Hardware to Machine Specifications

Obtain the original machine documentation or BOM (Bill of Materials) to identify the specified motor and amplifier models for the affected axis. Compare these with the installed hardware nameplates.

Contact the machine manufacturer if documentation is unavailable for accurate specs.

Do not assume compatibility based on similar models; exact matches are required.

Inspect Physical Connections

Ensure the motor and amplifier are correctly connected for the affected axis. Check for swapped cables or incorrect wiring that might suggest a mismatch.

Trace cables from motor to amplifier to confirm they are routed to the correct axis.

Power off the machine before inspecting or adjusting connections to avoid electrical shock.

Replace Incorrect Hardware if Needed

If the installed motor or amplifier does not match the machine specifications, replace the incorrect component with the correct model. Update parameters if necessary after replacement.

Keep spare parts or consult with a supplier for quick replacement to minimize downtime.

Improper hardware installation can damage the system; follow manufacturer guidelines for replacement.

Check FSSB Cable Connections

Inspect the FSSB fiber optic cables between the Fanuc control and the amplifier for the affected axis. Look for loose connections, damage, or dirt on the connectors.

Use a fiber optic inspection tool if available to check for micro-damage on connectors.

Do not bend or stress fiber optic cables; they are fragile and easily damaged.

Clean or Reseat FSSB Connectors

If dirt or poor connections are found, clean the fiber optic connectors with a specialized cleaning kit and reseat them securely. Avoid using regular cleaning materials that could damage the connectors.

Follow Fanuc’s recommended cleaning procedure for fiber optic connectors to avoid scratches.

Ensure the machine is powered off during cleaning to prevent accidental activation.

Test Communication After Repair

Power on the machine and check if the alarm persists. If it does, consider replacing the FSSB cable or consulting Fanuc support for deeper diagnostics of the communication module.

Monitor for intermittent alarms after repair, as they may indicate a degrading cable.

Do not ignore recurring communication errors; they can lead to more severe system failures.

Backup Current Parameters

Before making changes, back up all current parameters from the Fanuc control to an external device or memory card to prevent data loss in case of further issues.

Label the backup with the date and machine ID for easy reference later.

Failure to back up parameters can result in loss of critical machine settings.

Reload or Reset Parameters

If a backup of correct parameters exists, reload them into the control. Alternatively, perform a controlled reset of servo-related parameters as per the Fanuc manual and re-enter correct values.

Use the machine documentation to input correct parameter values after a reset.

Incorrect parameter resets can cause additional alarms; proceed with caution.

Test System and Monitor for Errors

After reloading parameters, cycle power and run a test program to check if the alarm clears. Monitor for recurring issues that might indicate a deeper software or memory problem.

Log any additional alarms during testing to help diagnose underlying issues.

If the problem persists, avoid repeated resets as they may exacerbate control issues.