Applicable Systems
SMODEX 90t
Symptoms
The crane reports a variable frequency drive alarm. The VFD has detected a fault and disabled the drive.
Possible Causes
- VFD overcurrent from motor or cable fault
- VFD overheating from inadequate cooling
- Input voltage transient or phase loss
Troubleshooting Steps
- Step 1: Check the VFD fault log for the specific code
Fault code is identified - Step 2: Verify VFD cooling fan and heat sink condition
Cooling is adequate - Step 3: Check input voltage and phase balance
Voltage is balanced and within range
How to Reset
To reset: Resolve the VFD fault, then reset the drive and test operation.
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Source: Konecranes Crane Safety Manual, Konecranes Plc
Category: Crane
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