Code SC: Output Short-Circuit or IGBT Fault
Issue Description & Safety Warning
The Yaskawa A1000 AC Drive has triggered a critical Output Short-Circuit or IGBT Fault 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
Code type: Fault Manual section: Yaskawa A1000 Troubleshooting Motor has been damaged from overheat or the motor insulation has been weakened. Check the motor insulation resistance and replace the motor if continuity is detected. The cable is damaged and is coming into contact with something causing a short-circuit. Check the motor power cable. Repair any short-circuits. Hardware fault. A short-circuit or grounding fault on the drive output side has damaged the output transistors. Make sure drive output is not shorted as follows: B1 ←→ U, V, W - (negative) ←→ U, V, W The above short-circuit will damage the output transistors. Contact your Yaskawa representative or our sales offices for assistance.
Source: Yaskawa AC Drive A1000 High Performance Vector Control Drive Technical Manual (SIEP C710616 21H)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Yaskawa A1000 AC Drive Alarms
Yaskawa controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code SC on the A1000 AC Drive identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Yaskawa's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 280 Yaskawa A1000 AC Drive codes.
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