New Type Code

What does 251 mean?

The frequency converter has detected a change in its internal type code, typically occurring after a control card replacement or a full drive swap. This alarm acts as an informational message signaling a significant change in the drive's identity or configuration. While not an immediate operational fault, it indicates a need to verify parameter settings for the new hardware.

• The control card (CPU board) of the frequency converter has recently been replaced.
• The entire frequency converter unit has been swapped for a new or refurbished unit.
• A major firmware update or parameter restoration process has been performed, altering the internal type code.
• This is an informational alarm, signaling a change in the drive's fundamental configuration.
• The drive's internal type code was corrupted and automatically corrected or flagged.

Click steps to track your progress.

1. 1

   Confirm recent service history, specifically the replacement of the control card or the entire drive unit.

2. 2

   Acknowledge the alarm via the Local Control Panel (LCP) and reset the drive (e.g., by power cycling or using P14-20 reset function).

3. 3

   If a control card was replaced, ensure that backed-up parameters (e.g., using LCP copy/paste) were correctly restored.

4. 4

   Verify that the drive functions as expected and the motor control is stable after the type code change.

5. 5

   Check the type code displayed on the LCP against the drive's nameplate or original documentation for consistency.