Contact your local Danfoss sales or service office for diagnosis and repair by certified service partners. You can also try these official support channels:
[Control Card / MCO Module] ----(Internal CAN Bus)----> [Power Board / Option Card] | [ERROR 1027 TRIP] (CAN Telegram Cannot Be Sent)
(likely the power board or control card). You should contact a certified Danfoss Service Department for repair or replacement. Top ten VFD tech support calls - Danfoss danfoss error 1027
According to documentation for systems like the Danfoss VLT LD 302 , error codes in the 1024–1279 range are related to CAN communication issues.
The underlying causes typically fall into three distinct categories: 1. Internal Communication Failures Contact your local Danfoss sales or service office
In essence, Alarm 1027 is your Danfoss drive’s way of telling you that it is experiencing a fundamental problem with its internal communication bus. This is not a simple configuration issue; it's a deep-seated fault preventing critical components of the drive from talking to each other reliably.
: Aged capacitors or failing logic gates on the control card. Step-by-Step Diagnostic Process Top ten VFD tech support calls - Danfoss
The error most frequently stems from specific internal communication breakdowns:
: If the network infrastructure checks out, the problem most likely resides inside the frequency converter itself. The official Danfoss documentation is explicit about this, classifying Error 1027 under the "Internal fault" alarm (Alarm 38). This indicates a failure that cannot be fixed by the end-user. A hardware failure might involve:
This is the primary cause of Alarm 1027. The "CAN telegram cannot be sent" descriptor reveals the issue: the drive's internal CAN bus, which allows its various circuit boards (like the control card and power card) to communicate, has failed. This failure can manifest as a corrupted data transmission, a broken communication path, or a complete inability to send messages.
Troubleshooting Danfoss Error 1027: CAN Telegram Faults The Danfoss VLT® Series drives, including the VLT® AutomationDrive FC 300 Go to product viewer dialog for this item.