Frequency drive starts and immediately shuts down, with code AFE1 (emergency stop)
Operator sent over following screen with active fault
Had to force K600M to stay energized (pressing in on the blue tab behind the plastic cover) to access drive and turn slew motor encoder to Partial Open Loop. (74.12)
Crane would start up and run, but operator didn’t like swing characteristics. To be expected, the slew drive is no longer receiving feedback from the motors, and is estimating speed and direction.
Replace slew motor encoder, and all is good.
**Note from Denis** Make sure and protect the shield with heat shrink or tape, as it can cause a short
If the motor encoder is internally shorted, the drive may not operate in partial open loop as it tries to protect itself. If this is the case, unplug the 2 connectors from the slew drive and reprogram parameter 90.46 to Force Open Loop.
Error messages on CCs would be Slewing Frequency Converter lost (00011.20482) or Slewing Frequency Converter not detected (00011.20481)