If a low resistance is found, disconnect the cable from the motor. Test the cable and the motor separately to determine which component is failing.
Why? Sometimes a glitch in the power supply causes a false LKG. A full cold boot fixes about 5% of LKG alarms.
To troubleshoot the LKG alarm effectively, you need to visualize how the system works. CNC machines rely on a "One-Shot" or intermittent lubrication system. fanuc lkg alarm
The cooling fans roared to life, a mechanical lung taking its first breath. He cleared the alarm on the pendant. This time, the red text vanished, replaced by the calm, steady green of "MDI / IDLE."
By understanding the "Latching Relay Keeping" system and following this guide, you can turn a potentially disastrous alarm into a routine maintenance event. If a low resistance is found, disconnect the
Prevention is far cheaper than downtime. Implement this checklist in your shop:
: You should immediately check the Insulation Degradation Monitor screen (Diagnosis) on the CNC to identify which axis or component is reporting the low resistance. Common Causes & Troubleshooting Sometimes a glitch in the power supply causes a false LKG
The is a critical status indicator that appears on the CNC display to signal insulation degradation within the system. Unlike standard numerical error codes (like SV0449 or SV0600), the LKG alarm is often displayed as a flashing indicator in the status bar at the bottom of the screen. What Does the LKG Alarm Mean?