Remote Terminal Communication Interruption

What does SLF3 mean?

An interruption in communication with the remote terminal (HMI). This means the drive has lost its connection to its human-machine interface, preventing local control, status monitoring, or parameter adjustments from the HMI. The drive may still operate if controlled externally.

• HMI (Human Machine Interface) cable disconnected or damaged (e.g., RJ-45 or proprietary cable).
• HMI module not securely seated in its port on the drive.
• Incorrect HMI communication parameters configured within the drive (e.g., HMI address, P1-20).
• Failure of the HMI unit itself or its internal communication interface.

Click steps to track your progress.

1. 1

   1. Verify the physical cable connection between the remote HMI and the drive's HMI port for secure seating and damage.

2. 2

   2. Power down the drive, remove the HMI, and then re-seat it firmly into its port.

3. 3

   3. Check drive parameters related to HMI communication (e.g., P1-20 for HMI address) to ensure correct configuration.

4. 4

   4. Try connecting a known-good HMI unit to the drive to determine if the fault lies with the HMI or the drive.

5. 5

   5. Inspect the HMI cable for proper shielding and ensure it is routed away from high-power cables to minimize EMI.