Motor Underload

What does 17 mean?

The motor is operating with insufficient load, meaning the actual load is below the expected or minimum threshold. This can occur if the mechanical load is unexpectedly disconnected or too light, or if drive parameters related to load monitoring are incorrectly set. While less critical than overload, persistent underload can indicate a process issue or inefficiency.

• Physical disconnection of the mechanical load from the motor shaft (e.g., broken coupling, shear pin failure).
• Process material flow interruption or reduction (e.g., pump running dry, conveyor belt empty), significantly reducing load.
• Incorrect motor underload supervision parameter settings (e.g., P1-09 Underload Threshold, P1-10 Underload Delay) configured too high.
• Mechanical fault in the driven equipment causing reduced friction or resistance (e.g., worn seals in a pump).
• Sensor input for underload supervision providing an erroneous low signal to the drive.

Click steps to track your progress.

1. 1

   1. Visually inspect the mechanical connection between the motor shaft and the driven equipment for breaks or disconnections.

2. 2

   2. Observe the process to confirm actual load conditions (e.g., fluid levels, material presence on a conveyor).

3. 3

   3. Monitor the motor's actual output current (e.g., P1-05) during operation and compare it to the expected minimum load current.

4. 4

   4. Review and adjust drive parameters P1-09 (Motor Underload Threshold) and P1-10 (Motor Underload Delay) to match normal operating conditions.

5. 5

   5. Verify any auxiliary sensors or feedback devices contributing to load monitoring are functioning correctly and providing accurate signals.