What are possible causes of SCF1 motor short circuit faults on the ATV61 and ATV71?
SCF 1 fault code indicates that the drive has detected a short on the output side of the drive that indicates the motor itself may be shorted. Troubleshooting steps are below:
- Check the cables connecting the drive to the motor, and the motor’s insulation
- Using a 1,000V Megger, test the motor and leads with the leads disconnected from the drive.
- Check for tight wiring connections.
- Perform the Transistor test via the [1.10 DIAGNOSTICS] menu with the motor connected.
- [Diagnostics] -> [Test Procedures] -> Transistor Test
- Run the drive open circuit (with the motor disconnected, OPL turned off, and Motor Control Type set to V/F 2pts) and check the drive's output (T) terminals for balanced voltages phase to phase
- [1.8 Fault Management] -> [Output Phase Loss] -> set to 'No'
- [1.4 Motor Control] -> [Motor control type] -> set to 'V/F 2pts'
- Perform a diode check using terminals U/T1, W/T2, V/T3, PA+ and PC-.
NOTE: This step should be performed when no line voltage is present on the drive. Power down the drive before performing this step.
Next measure between PC- to T1,T2,T3 and then swap leads. (total of 12 measurements: 6 measurements to PA+ and 6 measurements to PC-)
-Values outside the acceptable range can indicate damage to the IGBT's or other components in the drive.
Return programming to original settings after testing is complete.
If this article does not answer your question, check out our FAQ database that has answers to more commonly asked questions:
Frequently Asked Questions - Schneider Electric (se.com)
If this FAQ did not solve your issue, you can call us at 1-888-778-2733 Option 2 and then 4 or e-mail us atdrive.products.support@se.comto create a case with our Technical Support Team.
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