Code SVGN-203: GunA, GunB contact speed is different
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical GunA, GunB contact speed is different 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 contact speed used in this Pressure Schedule is different for Gun A and Gun B - but contact speed must match to achieve synchronized contact with the part. Remedy: Set the contact speed of the Pressure Schedule to the same value for both guns. This is done by adjusting the pressure calibration data which determines the contact speed. The Speed at a given Pressure must be the same for both guns. It is recommended to use matching Pressure and Speed values for each calibration point for both guns. Then, find the unique torque% required to achieve the pressure for each gun. OR, just set the contact speed for all points in the Pressure Calibration table for both guns to the same value.
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 SVGN-203 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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