Drive Long-Time Power Overload

What does 181 mean?

The drive has experienced a sustained power demand that continuously exceeds its rated capacity over an extended period. This condition signifies that the drive is consistently undersized for the application's demands, leading to thermal stress on its power components. Persistent long-time overloads will severely shorten the drive's operational life and lead to component failure.

• Continuous operation of the AC drive at a load current consistently above its rated continuous output current (e.g., >100% rated current).
• AC drive is fundamentally undersized for the application's continuous load requirements, despite occasional peak capabilities.
• Incorrect motor data (e.g., P1-07 Motor Rated Current) entered into the drive, causing its thermal model to miscalculate loading.
• Increased mechanical load on the motor due to process changes or mechanical degradation (e.g., worn bearings increasing friction).
• Insufficient cooling for the drive itself, causing its internal thermal model to register an overload condition more quickly.

Click steps to track your progress.

1. 1

   1. Measure the drive's average and RMS output current (e.g., P1-05) over a typical operating cycle and compare to the drive's continuous rating.

2. 2

   2. Re-evaluate the sizing of the AC drive to ensure its continuous current rating matches or exceeds the motor's full load current for the application.

3. 3

   3. Confirm that all motor parameters (P1-01 to P1-07) entered into the drive configuration precisely match the connected motor's nameplate data.

4. 4

   4. Verify the integrity and efficiency of the mechanical system driven by the motor to ensure there is no unnecessary load.

5. 5

   5. Inspect the drive's cooling system (fans, heatsink) for any degradation that might cause its thermal capacity to be reduced.