Serial communication timeout

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No serial communication is being received by the adjustable frequency drive. This warning is active only when parameter 514 (Bus time interval function) is set to a value other than OFF. If set to 'Stop and trip', it will escalate from a warning to an alarm after a timeout.

• Loss of communication signal on the serial bus (e.g., RS-485, Modbus RTU) due to cable break or disconnection.
• Incorrect communication parameters (e.g., baud rate P510, parity P511, address P512) configured in the drive or the master device.
• Master device (PLC, HMI) stopped sending commands or is powered off.
• Bus termination resistor missing or incorrectly set on the communication network, causing signal reflection.
• Excessive electrical noise on the communication lines, interfering with data transmission.

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1. 1

   Verify the communication cable connections at the drive's serial port (e.g., RJ-45, terminal block) and at the master device.

2. 2

   Confirm that the drive's communication parameters (P510, P511, P512, P514) match the master device's settings and network requirements.

3. 3

   Check the master device (PLC, controller) status and program logic to ensure it is actively sending communication frames.

4. 4

   Measure voltage levels on the communication bus lines (e.g., RS-485 A/B differential voltage) to confirm signal integrity using an oscilloscope.

5. 5

   Inspect the communication bus for proper termination resistors at both ends of the segment.

6. 6

   Temporarily disable or bypass potential noise sources (e.g., contactors, switching power supplies) to diagnose electromagnetic interference.