Code DS5387: CAN NOT START REFERENCE RETURN WITH MECHANICAL STOPPER SETTING
Issue Description & Safety Warning
The Fanuc 30i/31i/32i CNC has triggered a critical CAN NOT START REFERENCE RETURN WITH MECHANICAL STOPPER SETTING alarm. Immediate attention from a qualified operator or maintenance technician is required to prevent secondary damage to the equipment or spoiled parts during the manufacturing cycle. Always ensure standard safety and LOTO procedures are followed before accessing electrical cabinets.
Official Troubleshooting Steps
The slave axis is not within the in-position width, for example, when the distanc e between the mechanical stoppers for the master and slav e axes is larger than the withdrawal distance specified in parameter No. 7181 or 7182 for the master axis. Adjust the position of t he mechanical stoppers or the setting of parameter No. 7181 or 7182.
Source: Fanuc Series 30i/31i/32i-A Maintenance Manual, Appendix A Alarm List — PMC alarms (B-64485EN/01)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Fanuc 30i/31i/32i CNC Alarms
Fanuc controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code DS5387 on the 30i/31i/32i CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Fanuc's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 85 Fanuc 30i/31i/32i CNC codes.
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