SV0001

Power off and manually jog X-axis through full travel range. Check for tight spots, unusual resistance, grinding sounds, or binding indicating way damage or ballscrew issues.

Lock out main power before manual movement. Check for collision damage to axis components.

Navigate to DIAGNOSIS > SERVO and monitor D0300 (X-axis servo load meter) during manual movement. Normal unloaded travel should read 0-15%. Values above 30% during free movement indicate mechanical problem.

Check D0420 (X-axis disturbance torque) in real-time during movement. Excessive or spiking values indicate mechanical resistance or ballscrew contamination requiring inspection.

Inspect X-axis way surfaces, ballscrew, and coupling for damage, metal chips, coolant contamination, or inadequate lubrication. Clean and re-lubricate per OEM specifications if contaminated.

Navigate to SYSTEM > PARAM and verify parameter 2020 (X-axis motor serial number) matches the physical motor nameplate. Verify parameter 2022 (amplifier type code) matches the actual amplifier model installed.

Parameter mismatch after motor/amp replacement is common cause. Incorrect pairing causes improper current limits.

Check parameter 2166 (X-axis rapid traverse rate override acceleration time constant) and parameter 1622 (acceleration/deceleration after interpolation). Excessively aggressive values increase peak current demand beyond motor ratings.

Verify parameter 2168 (X-axis overload detection level) has not been modified from default 255. If previously increased to mask overload, restore to factory setting and address root mechanical cause.

If recent servo tuning performed, compare current parameters 1825-1828 (position/velocity loop gains) against known-good backup or factory defaults. Restore conservative tuning values and re-tune incrementally.

Check X-axis amplifier LED status. Fanuc αi/βi amplifiers show steady RED for overload fault. Note any flashing LED patterns and cross-reference with amplifier manual for specific fault codes.

Navigate to DIAGNOSIS > SERVO and monitor D0050-D0052 (X-axis U/V/W phase currents) during jogging at 10% rapid override. Imbalanced phase currents exceeding 10% difference indicate motor winding fault or cable damage.

Use low feedrate override. Phase imbalance indicates motor replacement likely required.

Check X-axis motor temperature via D0010 (motor temperature diagnostic). Excessive temperature above 70°C at idle or rapid temperature rise during light movement indicates motor bearing failure or winding short.

Measure motor winding resistance from amplifier connection (power off, leads disconnected). U-V, V-W, W-U phases should read identical within 5%. Verify insulation resistance to ground exceeds 10MΩ using 500V megger. Replace motor if failed.

Disconnect motor power cables at amplifier before resistance testing. High voltage megger test required.