Load fault warning

What does LDF mean?

This warning appears when the current load on the inverter deviates from the detection width defined by Pr.1488 (Upper limit warning detection width) or Pr.1489 (Lower limit warning detection width). It indicates an unexpected load condition, either too heavy or too light, potentially due to equipment issues.

• Mechanical binding or obstruction in the driven equipment, causing the motor current to exceed Pr.1488 (Upper limit warning detection width).
• Reduced mechanical load (e.g., conveyor belt breaking, pump cavitation) causing motor current to fall below Pr.1489 (Lower limit warning detection width).
• Incorrect calibration of Pr.1488 or Pr.1489 for the actual application load profile.
• Motor aging or degradation leading to higher current draw for the same load, exceeding the upper limit.
• External factors like product jam or material blockage altering the expected load.

Click steps to track your progress.

1. 1

   Monitor motor current (e.g., Pr.205 Output current monitor) and compare it to the expected operating current under normal load.

2. 2

   Inspect the mechanical system (e.g., bearings, belts, gears) for any signs of binding, wear, or obstruction.

3. 3

   Adjust Pr.1488 (Upper limit warning detection width) or Pr.1489 (Lower limit warning detection width) based on actual measured load current during stable operation.

4. 4

   Verify the motor's actual output power against the load demand using a power meter.

5. 5

   Check for unusual noise or vibration from the motor or driven equipment, indicating mechanical issues.