Inverter Overload

What does OL2 mean?

This fault indicates the inverter itself is experiencing an overload condition, likely due to excessive output current over time. It triggers a shutdown to protect the inverter's power components (IGBTs, rectifiers) from damage. Persistent inverter overload can lead to component failure, overheating, and reduced lifespan of the drive.

• Continuous inverter output current exceeding the inverter's rated continuous current (e.g., specified on nameplate) for an extended duration.
• Motor rated power (Parameter A1-02) or motor rated current (Parameter A1-01) incorrectly set, causing the inverter to underestimate the load.
• Poor motor tuning (e.g., in vector control modes) resulting in higher than optimal current draw for a given torque.
• Mechanical overload on the driven machine requiring continuous current above the inverter's safe operating limit.
• Inverter output voltage or frequency not correctly matched to the motor, leading to inefficient operation and higher current.

Click steps to track your progress.

1. 1

   1. Measure inverter output current using a true-RMS clamp meter and compare it to the inverter's continuous current rating (refer to the device nameplate).

2. 2

   2. Verify motor rated power (Parameter A1-02) and motor rated current (Parameter A1-01) are correctly configured in the inverter for the connected motor.

3. 3

   3. Monitor the inverter's internal current feedback (e.g., Parameter C1-01) and compare it against external measurements for accuracy.

4. 4

   4. Inspect the driven machinery for any mechanical issues (e.g., worn bearings, misalignment) that could cause continuous high loading.

5. 5

   5. Increase acceleration and deceleration times (e.g., Parameters F2-01, F2-03) to reduce transient current demands during speed changes.