Code

Name

Causes

Possible Solutions

SC

Short Circuit/IGBT Failure

Overheating caused damage to the motor or the motor insulation is not satisfactory.

Measure the motor insulation resistance, and replace the motor if there is electrical conduction or unserviceable insulation.

The motor main circuit cable is contacting ground to make a short circuit.

  • Examine the motor main circuit cable for damage, and repair short circuits.

  • Measure the resistance between the motor main circuit cable and the ground terminal. If there is electrical conduction, replace the cable.

A short circuit or ground fault on the drive output side caused damage to the output transistor of the drive.

  • Make sure that there is not a short circuit in terminal B1 and terminals U/T1, V/T2, and W/T3. Make sure that there is not a short circuit in terminals - and terminals U/T1, V/T2, and W/T3.

  • If there is a short circuit, contact Yaskawa or your nearest sales representative.

When A1-02 = 5, 6, 7 [Control Method Selection = OLV/PM, AOLV/PM, or CLV/PM], the output current is more than the value set in L8-27 [Overcurrent Detection Gain].

Set L8-27 correctly.
Note:

  • The drive detects this error if there is a short circuit or ground fault on the drive output side, or an IGBT failure.

  • Do a Fault Reset to clear the fault.