Output Short-Circuit or IGBT Fault

What does SC mean?

A short-circuit or ground fault is detected on the drive output side, which could be due to motor insulation damage, a shorted motor cable, or a hardware fault within the drive's output transistors (IGBTs). If unresolved, this fault can lead to significant damage to the drive's internal circuitry.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Verify that the drive output is not shorted (e.g., B1 ←→ U, V, W or – (negative) ←→ U, V, W), as this will damage output transistors.

2. 4

   If a hardware fault within the drive is suspected after checking external components, contact your Yaskawa representative for assistance or replacement.