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ErrorLib — Industrial Fault Code Library

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Err.

Wrong password entered

Danfoss · VLT Micro Drive FC 51

What does Err. mean?

An incorrect password was entered when attempting to access or modify a password-protected parameter or menu on the LCP. This security feature prevents unauthorized configuration changes to the drive, ensuring operational integrity.

Common Causes

  • Incorrect numerical password entered via the LCP when attempting to access a locked menu (e.g., 'Menu 0 - Operation').
  • Forgetting or mistyping the user-defined password (e.g., set in Parameter 16-00, 'Access code' or other security parameters).
  • Attempting to access a higher access level (e.g., 'Advanced', 'Expert') without the correct corresponding password set in Parameter 16-00.
  • Password parameter (e.g., Parameter 16-00) reset to default, but an old, incorrect password is still being used.
  • Multiple failed attempts causing a temporary lockout feature to activate.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Re-enter the known password carefully, ensuring no digits are mistyped and verifying the numerical value.

  2. 2

    If the password is unknown, refer to the plant's documentation or the drive's default password (often '0', or four-digit default specified in manual).

  3. 3

    Attempt to reset the password by setting Parameter 16-00 (Access code) to '0' (User defined) and then changing the password if access is possible.

  4. 4

    If unable to access, consider performing a factory reset (e.g., Parameter 14-22, 'Operation Mode') which typically resets all passwords to default, then reconfigure.

  5. 5

    If a temporary lockout is suspected, wait for a specified period (e.g., 30 seconds) before re-attempting password entry.

Browse all codes in this manual (51)
Verified technical data. Last updated: April 2026

Related Faults

00Parameter number does not exist (Register 0007)01No write access to the parameter (Register 0007)02Data value exceeds parameter limits (Register 0007)
Source: Danfoss VLT Micro Drive FC 51
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