Communication Timeout Fault

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This fault indicates a loss of serial communication (e.g., Modbus) between the drive and its control system for more than 2 seconds, affecting parameters like H5-04 and H5-05. The drive will execute a programmed stopping method, becoming unresponsive to external commands. Prolonged communication loss can lead to process interruption and potential safety hazards if the drive is not properly controlled.

• Loss of communication from the master controller (e.g., PLC, HMI) to the drive, due to a program stop, power loss, or communication port failure on the master.
• Intermittent or broken network cable connection between the drive and the master, causing data packets to be lost or corrupted.
• Incorrectly configured communication timeout settings (e.g., H5-04 Communication Timeout Detection Time, H5-05 Communication Timeout Action) in the drive.
• Excessive network traffic, latency, or bus contention preventing the drive from receiving a valid command within the timeout period.
• Incorrect network address (H5-02) for the drive, causing the master to send commands to the wrong device or the drive to ignore incoming messages.

Klicken Sie auf Schritte, um Ihren Fortschritt zu verfolgen.

1. 1

   Verify the operational status of the master controller (PLC/HMI) and its communication port, ensuring it is powered on and actively sending commands to the drive.

2. 2

   Inspect the network cable and connectors between the drive and the master for physical damage, looseness, or intermittence, using a cable tester if available.

3. 3

   Adjust parameter H5-04 (Communication Timeout Detection Time) to a longer duration (e.g., 5-10 seconds) to account for expected network latency or intermittent traffic.

4. 4

   Confirm that parameter H5-02 (Communication Node Address) on the drive matches the address configured in the master controller's communication settings.

5. 5

   Use network diagnostic tools to monitor the serial communication bus (e.g., Modbus RTU traffic) for errors, delays, or periods of inactivity from the master.