Code FRCE-509: AIT Y direction environment NG (F:%d^1)
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical AIT Y direction environment NG (F:%d^1) 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
Cause: An environmental characteristic in the Y direction could not be acquired in the impedance parameters auto tuning. Remedy: Modify the force control parameters in the following order; then execute the impedance parameters auto tuning again. 1. The impedance change for the environmental characteristic acquisition might be too rough. Increase the system variable $CCSCH_GRPxx[i].$TD.$NUM_KEI[1]. [The schedule number is calculated as ((xx-10)*5+i). Modify the appropriate $CCSCH_GRPxx[i]. 2. The desired force might be too small. Increase the desired force. 3. The desired force might be too large. Decrease the desired force.
Source: FANUC Robot R-30iA Alarm Code List Operator's Manual
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Fanuc R-30i Series Robot Controller Alarms
Fanuc controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code FRCE-509 on the R-30i Series Robot Controller 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: 6553 Fanuc R-30i Series Robot Controller codes.
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