Servo drive Troubleshooting: Causes & Fixes

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Problems on this page:

Following (position) error fault Servo overheating or overload Oscillation or hunting

Following (position) error fault

Hits OEE: Availability

Symptoms: Drive faults on excessive following error and the axis stops mid-move.

Mechanical binding or overload

Check for binding and jams; confirm the load and inertia.

Tuning gains too low

Re-tune the loop gains for the load.

Encoder feedback fault

Check the encoder, coupling and cable.

Prevention: Mechanical condition checks, correct tuning, encoder integrity.

Servo overheating or overload

Hits OEE: Availability

Symptoms: Drive or motor overtemperature or overload fault, thermal trips.

Continuous load above rating

Check the duty cycle and sizing; reduce load or upsize.

Mechanical drag or misalignment

Fix binding, alignment and lubrication.

Cooling or ambient issue

Clean heatsinks and fans; check panel cooling.

Prevention: Correct sizing, mechanical health, cooling maintenance.

Oscillation or hunting

Hits OEE: Performance

Symptoms: Axis vibrates, buzzes or oscillates around position, poor finish.

Gains too high

Reduce the loop gains; re-tune for stability.

Mechanical backlash or resonance

Remove backlash; add a notch filter for resonance.

Loose coupling or mounting

Tighten the coupling and mounts.

Prevention: Stable tuning, backlash control, secure mechanics.

Servo drive troubleshooting FAQ

Servo drive: what causes following (position) error fault, and how do I fix it?

Symptoms: Drive faults on excessive following error and the axis stops mid-move. Likely causes: Mechanical binding or overload; Tuning gains too low; Encoder feedback fault. Fixes: Check for binding and jams; confirm the load and inertia. Re-tune the loop gains for the load. Check the encoder, coupling and cable. Prevention: Mechanical condition checks, correct tuning, encoder integrity.

Servo drive: what causes servo overheating or overload, and how do I fix it?

Symptoms: Drive or motor overtemperature or overload fault, thermal trips. Likely causes: Continuous load above rating; Mechanical drag or misalignment; Cooling or ambient issue. Fixes: Check the duty cycle and sizing; reduce load or upsize. Fix binding, alignment and lubrication. Clean heatsinks and fans; check panel cooling. Prevention: Correct sizing, mechanical health, cooling maintenance.

Servo drive: what causes oscillation or hunting, and how do I fix it?

Symptoms: Axis vibrates, buzzes or oscillates around position, poor finish. Likely causes: Gains too high; Mechanical backlash or resonance; Loose coupling or mounting. Fixes: Reduce the loop gains; re-tune for stability. Remove backlash; add a notch filter for resonance. Tighten the coupling and mounts. Prevention: Stable tuning, backlash control, secure mechanics.

Guidance only. Always follow lockout/tagout and your site's safe-work procedures, and verify against OEM manuals before acting.

Stop the same fault coming back

Recurring servo drive stops usually trace to a cause you cannot see by hand. The partner we recommend is Fabrico: EU-built, so your production data stays in EU jurisdiction, with computer-vision true-cause of micro-stops, a closed loop from PLC-read OEE to an auto-routed work order, and ISO 27001 / 20000-1 / 9001 (supports audit-readiness).

See how Fabrico finds root cause

OEE Lab is built and operated by Fabrico. The directory stays free.

Methods that cut recurring stops: the six big losses · root cause analysis · preventive vs predictive maintenance · TPM · SMED & changeover