What causes fault code VFD-ML1 (VFD Motor Overload)?

Mechanical binding in driven equipment — motor working harder than normal. Motor bearings failing — increased friction load. Motor overload parameter set too low — doesn't match motor FLA. Loose or broken belt/coupling — motor cycling on unloaded/overloaded. Ambient temperature causing motor to run hotter. Product jam or material buildup on conveyor/equipment

How do I fix fault code VFD-ML1?

Check drive display for actual motor amps — compare to motor nameplate FLA. Verify motor overload parameter matches motor nameplate FLA. Check mechanical load — try to turn motor shaft by hand with equipment. Inspect motor bearings — listen for grinding, check bearing temperature. Clear any product jams or material buildup. If motor is old, check winding resistance — degraded windings draw more current. Consider upsizing motor if load has increased permanently

VFD Motor Overload

VFD-ML1

Electronic motor overload protection tripped. Motor drawing more than rated current for extended duration.

medium vfd conveyor packaging palletizer

vfd motor overload current bearings mechanical

Probable Causes (ranked)

Mechanical binding in driven equipment — motor working harder than normal
Motor bearings failing — increased friction load
Motor overload parameter set too low — doesn't match motor FLA
Loose or broken belt/coupling — motor cycling on unloaded/overloaded
Ambient temperature causing motor to run hotter
Product jam or material buildup on conveyor/equipment

Fix Steps

1 Check drive display for actual motor amps — compare to motor nameplate FLA
2 Verify motor overload parameter matches motor nameplate FLA
3 Check mechanical load — try to turn motor shaft by hand with equipment
4 Inspect motor bearings — listen for grinding, check bearing temperature
5 Clear any product jams or material buildup
6 If motor is old, check winding resistance — degraded windings draw more current
7 Consider upsizing motor if load has increased permanently

Field Trick

Compare drive amps to motor nameplate. If amps are at or above FLA at what used to be a light load, suspect bearings or mechanical binding.

Suggested Replacement Parts

Parts matched to fault category: Motor

Baldor/ABB 1HP TEFC Motor P/N: EM3554T 1HP, 1765RPM, 143TC frame, 230/460V, TEFC, premium efficiency

AutomationDirect $285.00 Amazon $310.00 Grainger $345.00

Prices are estimates. Verify part numbers match your equipment before ordering.

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