Danfoss VFD fault codes

常见原因

• Shock load or fast acceleration
• Motor or cable fault
• Damaged power card

检查内容

• Disconnect the motor cable and run the drive without load: if the fault stays, the drive itself is faulty
• Megger the motor and cable for insulation or phase-to-phase faults
• Increase acceleration/deceleration time; check for mechanical jams

常见原因

• Short circuit in the motor or cable
• Failed output stage

检查内容

• Disconnect the motor; if the alarm remains, the power card needs repair

常见原因

• Motor or cable insulation failure

检查内容

• Megger the motor and cable to earth
• Check for water or dust in the motor terminal box
• If insulation is fine, the output IGBT or current sensor may be faulty

常见原因

• Deceleration too fast
• Supply overvoltage

检查内容

• Increase the deceleration time or enable the stall/overvoltage prevention function
• Check the braking resistor and braking transistor (if fitted)
• Measure the supply voltage – it should be within the drive's rating

常见原因

• Supply loss or low voltage
• Faulty soft-charge circuit

检查内容

• Measure all three input phases under load
• Check input fuses, contactor and loose terminals
• If the supply is fine, check the DC bus capacitors and pre-charge circuit

常见原因

• Missing phase or large imbalance

检查内容

• Measure all three input phases under load
• Check input fuses, contactor and loose terminals
• If the supply is fine, check the DC bus capacitors and pre-charge circuit

常见原因

• Load above the drive rating

检查内容

• Reduce load or use a larger drive

常见原因

• Fan failure
• Blocked heatsink
• High ambient temperature

检查内容

• Clean the heatsink and check that the cooling fan runs
• Check the panel temperature and ventilation
• Reduce the load or carrier frequency