Installation manual

Diagnostics and Troubleshooting
292 S1A28692 03/2010
SCF1
[Motor short
circuit]
• Short-circuit or grounding at the drive
output.
• Check the cables connecting the drive to the motor, and the
motor insulation.
• Reduce the switching frequency.
• Connect chokes in series with the motor.
• Check the adjustment of speed loop and brake.
• Increase the [Time to restart] (ttr), page 88.
• Increase the switching frequency.
SCF3
[Ground short
circuit]
• Significant earth leakage current at the
drive output if several motors are
connected in parallel.
• Check the cables connecting the drive to the motor, and the
motor insulation.
• Reduce the switching frequency.
• Connect chokes in series with the motor.
• Check the adjustment of speed loop and brake.
• Increase the [Time to restart] (ttr), page 88.
• Reduce the switching frequency.
SOF
[Overspeed]
• Instability or driving load too high. • Check the motor, gain and stability parameters.
• Add a braking resistor.
• Check the size of the motor/drive/load.
• Check the parameters settings for the
[FREQUENCY METER] (FqF-) function page 247
, if it is
configured.
SPF
[Speed fdback
loss]
• Signal on "Pulse input" missing, if the
input is used for speed measurement.
• Check the wiring of the input cable and the detector used.
tnF
[Auto-tuning]
• Special motor or motor whose power is
not suitable for the drive.
• Motor not connected to the drive.
• Motor not stopped
• Check that the motor/drive are compatible.
• Check that the motor is present during auto-tuning.
• If an output contactor is being used, close it during auto-
tuning.
• Check that the motor is stopped during tune operation.
Detected Fault Name Probable cause Remedy
Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: [phone]-Outside Local Area: [phone]-www.stevenengineering.com