Overcurrent in output stage

What does F1.2 mean?

The motor current flowing through the output stage is excessively high, potentially due to an undersized motor, issues with the current supply or transformer, incorrect ramp times, a defective phase module, or an unstable 24 V supply. This condition can lead to severe damage to both the drive and the motor if not corrected.

• Motor load exceeding the drive's continuous current rating (e.g., Parameter P3-01) or short-time overload capacity.
• Incorrectly set acceleration or deceleration ramp times (e.g., Parameter P3-04, P3-05) causing rapid current surges.
• Mechanical binding or jamming in the driven machinery causing excessive motor torque demand.
• Undersized motor for the application, leading to continuous operation at or above its current limit.
• Drive control parameters (e.g., Parameter P2-01, P2-02 for V/f control) not tuned to the motor and load characteristics.

Click steps to track your progress.

1. 1

   Monitor the actual motor current (e.g., Parameter P7-01) during operation and compare to the drive's rated output current and motor nameplate current.

2. 2

   Increase acceleration time (e.g., Parameter P3-04) and deceleration time (e.g., Parameter P3-05) to reduce current peaks during speed changes.

3. 3

   Measure the mechanical torque required by the load using a torque wrench or appropriate sensor to verify it's within motor specifications.

4. 4

   Verify motor parameters P3-01 (Rated current), P3-02 (Rated voltage), and P3-03 (Rated frequency) are correctly entered into the drive.

5. 5

   Disconnect the motor from the mechanical load and run the drive in no-load condition to isolate if the fault is mechanical or electrical.