Comm Loss (Adv. Code 0)

What does 25 mean?

This fault indicates a loss of communication when the drive is operating via a serial link. The time elapsed since the last Modbus communication exceeded the limit set in parameter 903 (SIO Timer). This can prevent external control or monitoring of the drive.

Complete Troubleshooting Guide

1. 1

   Verify all physical Modbus connections for integrity, proper termination, and shielding to prevent interference.

2. 2

   Adjust the value of parameter 903 (SIO Timer) if the communication timeout is too short for the application's network conditions or expected communication delays.

3. 3

   Check the external Modbus master device or PLC for operational status, proper message sending, and absence of communication errors.