i550: Error message when updating firmware via controller from V7.0 to V7.5 and higher (fixed with V7.5)

Corrected by:
Frequency Inverter cabinet i550 V7.5

Behavior of the new version:
As of firmware version 7.5, the i550 cabinet supports the firmware download by the Lenze Controller via EtherCAT.

Description of the behavior:

  • EtherCAT bus is not operational.
  • The following error message is displayed in the controller logbook:
    Firmware-DL to L_i550: Firmware update failed. The main version cannot be changed.

conditions under which the behavior occurs:
The behavior occurs if an i550 with version V7.5 (or newer) is inserted in a PLC Designer project and an i550 with version V7.0 is physically connected to the Lenze Controller via EtherCAT. In addition, the firmware download function for this i550 must be activated (Firmware/parameter sets tab). 

Affected products: 
Frequency Inverter cabinet i550 V7.0 (connected to Lenze Controller)

Short-term measures, Recommendations, Rating:
Update the firmware of the i550 to version V7.5 or newer via the diagnostic interface of the device before connecting it to the Lenze Controller via EtherCAT.

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URL for linking this AKB article: https://www.lenze.com/en-de/go/akb/202500253/1/
Meta data
Taxonomy: i550 cabinet frequency inverters
AKB-ID: 202500253
Last update: 2025/09/24
Category: Version Informations

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