Control word time-out
Danfoss · VLT HVAC Basic FC 101
What does 17 mean?
The frequency converter has stopped receiving valid control word commands via its serial communication interface, leading to a timeout. This alarm is active when parameter 8-04 Control Timeout Function is not set to [0] Off. If configured to Stop and Trip, the drive will safely ramp down and then trip, indicating a loss of communication. Unresolved communication loss prevents external control of the drive.
Additional Steps
Steps 1–2 are listed in Priority Fix.
- 3
Increase the value of parameter 8-03 Control Timeout Time if the communication network experiences legitimate delays or if the controller's update rate is slower.
- 4
Check for and mitigate any electromagnetic interference (EMI) affecting the communication bus, ensuring proper shielding and grounding in accordance with EMC requirements.