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ErrorLib — Industrial Fault Code Library

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21

Parameter error

Danfoss · VLT AutomationDrive FC 301/302

What does 21 mean?

A parameter has been configured with a value that falls outside its acceptable range. The specific parameter number is typically displayed on the drive's LCP, indicating an invalid setting.

Common Causes

  • Parameter value entered manually is outside the acceptable minimum or maximum range (e.g., P1-54 Motor Rated Torque).
  • Configuration uploaded from a drive of a different model, size, or firmware version leading to incompatible parameter values.
  • Automatic tuning process (e.g., autotune P1-20) attempted to write an invalid value to a parameter.
  • Internal corruption of stored parameter settings requiring a factory reset and re-entry.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Note the specific parameter number (e.g., P1-54) displayed on the drive's Local Control Panel (LCP) indicating the error.

  2. 2

    Access the drive's parameter menu and navigate to the identified parameter (e.g., P1-54).

  3. 3

    Refer to the drive's operating manual to find the valid minimum and maximum range for the specific parameter.

  4. 4

    Enter a value for the parameter that falls strictly within its acceptable operating range (e.g., 45Nm for P1-54 if max is 50Nm).

  5. 5

    Save the parameter changes and monitor the LCP for fault resolution.

Browse all codes in this manual (66)
Verified technical data. Last updated: April 2026

Related Faults

#14Earth (ground) fault#32Motor phase W missing#36Mains failure
Source: Danfoss VLT AutomationDrive FC 301/302
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