Code SV0436: Soft thermal (OVC)
Issue Description & Safety Warning
The Fanuc Alpha-i Servo Spindle Amplifier has triggered a critical Soft thermal (OVC) 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
Also shown as: SV0436 (15i), SV0436 (30i/31i/32i), SV0436 (0i-D) Action: No. 1786 (FS15i) Overload protection coefficient (OVC22) No. 2163 (FS16i) No. 1787 (FS15i) Overload protection coefficient (OVCLMT2) No. 2165 (FS16i) Measure the actual current values (IR, IS) using the SERVO GUIDE, compare the values with overload duty curves in the Servo Motor Descriptions (B-65262EN), and check whether the load on the machine is too large compared with the motor capacity. If the actual current is high on acceleration/deceleration, it is likely that the time constant is too small.
Source: Fanuc αi Servo/Spindle Amplifier Maintenance Manual (B-65285EN/04) — Part II Troubleshooting
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Fanuc Alpha-i Servo Spindle Amplifier Alarms
Fanuc controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code SV0436 on the Alpha-i Servo Spindle Amplifier 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: 135 Fanuc Alpha-i Servo Spindle Amplifier codes.
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