Code SRVO-136: DCLVAL alarm (G:%d A:%d)
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical DCLVAL alarm (G:%d A:%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 servo amplifier DC current (DC link voltage) is abnormally low. Remedy: The case of R-30iA Controller: • This alarm occurred when robot is moving. 1. Check the input voltage to the controller is within the rated voltage and no phase is lack. And check the setting of the transformer is correct. 2. It is possible that an instant disconnection of power source causes this alarm. Check whether an instant disconnection occurred. 3. Replace the E-stop unit. 4. Replace the servo amplifier. • If this alarm occurred before the magnetic contactor is turned on : 1. Check whether the circuit breaker in the emergency stop unit is OFF. If it is OFF, check the servo amplifier and the wiring between the servo amplifier and the emergency stop unit. If anything is abnormal, replace it. Else turn on the breaker. 2. Check the input voltage to the controller is within the rated voltage and no phase is lack. And check the setting of the transformer is correct. 3. Replace the E-stop unit. 4. Replace the servo amplifier. • In an auxiliary axis system and if this alarm occurred right after the EMERGENCY STOP button was pressed, check whether the auxiliary axis unit is installed correctly. • In the case of the Mate Controller, refer to the Mate Controller Maintenance Manual.
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 SRVO-136 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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