Data Out of Inverter Range

What does #21 mean?

The Destination Device (inverter) detected an attempt to write data to a holding register where the value is outside the permissible operational range. This prevents the inverter from accepting the value, often to protect itself from invalid settings or unsafe operation, such as setting an over-limit frequency or an excessively low acceleration time.

• The numerical value sent to a holding register (e.g., speed reference, acceleration time) exceeds the maximum or falls below the minimum limit allowed by the inverter.
• Scaling or unit conversion errors within the master device result in an out-of-range value being transmitted to the inverter.

Click steps to track your progress.

1. 1

   Review the data value being written to the holding register and compare it against the valid range specified in the inverter's documentation (e.g., '8-9 Modbus Communication Data Lists' in the MX2 User’s Manual).

2. 2

   Adjust the data value to fall within the acceptable operational limits of the inverter.

3. 3

   Check any software or HMI scaling factors applied to the value before it is sent to the inverter to ensure correct conversion.