Fanuc SV 424 X: Fanuc 0i Error Code SV 424 X

Symptoms

The sub-axis digital servo system has detected an alarm. Alarm SV 424 is displayed for the X axis.

Possible Causes

X axis servo amplifier fault or overload
X axis servo motor cable damaged or disconnected
X axis mechanical binding or excessive load
Servo parameter setting incorrect for this axis

Troubleshooting Steps

Step 1: Check the X axis servo amplifier status LEDs for alarm indication
Amplifier status LED shows alarm code if amplifier fault
Step 2: Inspect X axis servo motor cable and connectors for damage
Cable intact, connectors properly seated
Step 3: Check X axis mechanical system for binding or excessive load
Axis moves freely without excessive force when motor is de-energized
Step 4: Verify servo parameters for X axis match motor and amplifier specifications
Parameters match the motor/amplifier data sheet
Step 5: Clear alarm and test axis movement at low speed
Axis moves smoothly without alarm returning

How to Reset

Power off the machine, correct the fault, power on, and press RESET. For servo alarms, always investigate the root cause before restarting to prevent damage.

Common Replacement Parts

varies: X axis servo amplifier or motor (if confirmed faulty) (Confirm with FANUC servo system test before replacement)

Frequently Asked Questions

Q: What does Fanuc SV 424 X alarm mean?
Digital Servo (Sub): The sub-axis digital servo system has detected an alarm. This alarm is specific to the X axis.
Q: How do I clear Fanuc SV 424 alarm?
Power off the machine, investigate the servo amplifier status, check motor cables and mechanical system, then power on and clear the alarm with RESET.

Fanuc 0i Error Code SV 424 X