Motor Overload

What does OLF mean?

This fault signifies that the motor's I²t thermal protection has tripped due to a prolonged overload condition, indicating excessive current draw over an extended period. Sustained motor overload will lead to winding insulation breakdown and permanent motor damage.

• Mechanical overload on the motor shaft (e.g., jammed bearings, increased friction, product blockage).
• Incorrect motor rated current (Parameter P0-04) or motor overload protection (Parameter P1-03) setting in the drive.
• Motor cooling fan failure or obstructed cooling fins on the motor itself.
• Excessive duty cycle (e.g., continuous operation at peak torque) beyond motor's thermal capacity.
• High ambient temperature around the motor, reducing its ability to dissipate heat.

Click steps to track your progress.

1. 1

   1. Measure actual motor operating current (drive display parameter P0-07) and compare to motor nameplate rated current.

2. 2

   2. Verify motor nameplate data (especially rated current and service factor) against drive parameters (P0-04, P1-03).

3. 3

   3. Check motor shaft for free rotation (power off) and inspect mechanical load for obstructions or excessive friction.

4. 4

   4. Inspect motor cooling fan for damage or obstruction and ensure motor cooling fins are clear of dust/debris.

5. 5

   5. Monitor motor surface temperature with an IR thermometer to detect excessive heating.