Code ISD-087: %s ratio low (ISD%d)
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical %s ratio low (ISD%d) 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: The software has detected an excessively low ratio for the ISO/POLY mixture. This is more severe than ISD-086, and may result in serious material application defects. Remedy: The deviation of the ISO/POLY ratio is greater than the “ISO/POLY Min Fault Ratio” level for a period of time greater than the “ISO/POLY Lo Ratio Flt T/O” duration. Verify that the dispense equipment (pressure regulators, flow meters and spray modules, etc.) is functioning correctly. Verify that the settings on the Dispenser Setup screen are reasonable. 4.9 J 4.9.1 JOG Alarm Code
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 ISD-087 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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