Servo Drive Following Error

Servo axis position error has exceeded the allowable following error window. The commanded position and actual position differ by more than the configured tolerance.

Probable Causes (ranked)

• Mechanical obstruction or binding preventing axis from reaching commanded position
• Servo motor brake not releasing — motor cannot turn freely
• Servo gain parameters need tuning — too low causes lag, too high causes oscillation
• Encoder feedback error — cable noise, loose connection, or encoder fault
• Load inertia changed — new tooling or product weight exceeds original servo sizing
• Coupling between motor and load slipped — lost mechanical connection

Fix Steps

1. 1 Check for mechanical obstruction — disable drive, try to move axis by hand
2. 2 Listen for motor brake release when drive enables — confirm brake releases cleanly
3. 3 Check motor-to-load coupling — verify setscrew torque, keyway condition, or belt tension
4. 4 Inspect encoder cable connections at motor and drive — reseat both ends
5. 5 Review servo drive fault log for pattern — same position every time suggests mechanical issue
6. 6 If load changed, servo gains may need re-tuning — contact controls engineer
7. 7 Reset fault, re-home axis, and attempt motion at reduced speed to isolate issue

Suggested Replacement Parts

Parts matched to fault category: Servo Drive

Prices are estimates. Verify part numbers match your equipment before ordering.

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