FANUC 0i-F SV0410 on vertical axis after E-stop, what to check?
I'm getting an SV0410 EXCESS ERROR (STOP) on my FANUC 0i-F controller, specifically on the Z-axis. It happens right after I release the E-stop, and the axis seems to drop slightly before holding. What should I investigate first?
The FANUC 0i-F SV0410 alarm indicates that the positional deviation of an axis while it was commanded to be stopped exceeded the limit set in parameter 1829. This typically occurs when an external force or gravity causes the axis to drift from its commanded standstill position. For a vertical axis alarming after an E-stop release, a common cause is related to the brake or gravity load.
Likely causes and checks
1Brake or gravity load on a vertical axis
- Points to it
- The vertical axis (Z-axis) is subject to gravity, and if the motor brake doesn't engage or hold correctly, or if a counterbalance system isn't functioning, the axis can drop and exceed the positional deviation limit at standstill.
- Check
- Observe Diagnosis Data 300 for the Z-axis while enabling the servo. Verify that the motor brake releases and holds correctly, and confirm that any counterbalance mechanism is working as intended.
2External force on a stopped axis
- Points to it
- Although less likely immediately after an E-stop release, an external force from a clamping operation, indexing, or workpiece contact could push the axis out of position while it's supposed to be stopped.
- Check
- If the alarm coincides with any mechanical interaction, repeat the operation and monitor Diagnosis Data 300. If the value increases during the interaction, address the mechanical issue.
3Servo cannot hold position (amplifier, motor or feedback)
- Points to it
- Issues with the servo amplifier, motor, or feedback system can prevent the axis from maintaining its commanded position, leading to creeping or hunting at standstill.
- Check
- Inspect the power and feedback cables at both the motor and amplifier for any damage or loose connections. Also, review the alarm history for any other servo-related alarms like SV0436 or Pulsecoder alarms.
4Limit set too tight
- Points to it
- The positional deviation limit set in parameter 1829 might be too restrictive for the machine's normal operation, especially if it was recently changed or tuned.
- Check
- Compare the current value of parameter 1829 with the machine builder's original parameter backup to ensure it's set correctly.
Next check: Start by checking the motor brake and counterbalance system on the Z-axis, observing Diagnosis Data 300 during servo enable and E-stop release.
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