During long holidays or extended production pauses, CNC machines are often powered off for long periods. Prolonged downtime may increase the risk of system data loss, reference position errors, or alarm issues when the machine is powered on again.
To minimize these risks, it is strongly recommended to carry out essential preparations before shutdown. For FANUC CNC systems, proper planning can significantly improve system reliability and reduce recovery time after extended downtime.
If you encounter any FANUC system issues during or after long-term shutdown, our technical team is ready to support you.
Perform System Data Backup Before Long-Term Shutdown
Before a CNC machine is shut down for an extended period, system data backup is one of the most critical preventive measures.
Unexpected power-related issues, battery depletion, or hardware replacement after long-term shutdown may result in data loss. A complete backup allows the system to be restored quickly and safely if abnormalities occur.
For FANUC CNC systems, commonly backed-up data includes:
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CNC parameters and part programs
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SRAM data
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PMC programs and user-created files
Completing a full backup in advance greatly reduces the risk of system recovery difficulties after downtime.
Further Reading:
CNC System Data Backup and Restore | FANUC Knowledge Base
FANUC CNC Parameter Backup Guide
Check and Replace Batteries Before Extended Downtime
During long-term shutdown, CNC system batteries and servo amplifier batteries are key risk points.
If battery voltage drops too low, the following problems may occur:
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Loss of CNC system data
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Loss of machine reference position
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Battery-related alarms after power-on
To protect system stability, it is recommended to:
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Check battery condition regularly
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Replace CNC and amplifier batteries before long-term shutdown or on a yearly basis
Preventive battery replacement can effectively avoid data loss and reference errors caused by battery depletion.
Further Reading:
CNC Battery Replacement Guidelines and Precautions | FANUC Support
What If Alarms Appear After Powering On?
After a long period of downtime, FANUC CNC systems may display alarms related to batteries, fans, or system status during startup.
To avoid repeated or incomplete troubleshooting, we recommend referring to the dedicated article below for detailed alarm explanations and solutions:
Troubleshooting FANUC CNC Alarms After Long-Term Shutdown
