Internal Fault: Serial port overflow

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The internal serial communication buffer has overflowed, meaning data is being received faster than the drive can process it. This leads to data loss and unreliable serial communication, affecting remote control and monitoring via the serial port.

• External serial communication device (e.g., PLC, HMI) sending data to the drive faster than the drive's serial port can process it.
• Misconfigured baud rate, data bits, or stop bit settings between the drive and the external serial device.
• Excessive electrical noise or interference on the serial communication cable, causing retransmissions and buffer filling.
• Software bug in the drive's serial communication handling routine, leading to inefficient buffer management.

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1. 1

   1. Verify the serial communication parameters (baud rate, data bits, parity, stop bits) in the drive's settings (e.g., parameter 8-xx for communication) and ensure they precisely match the external device.

2. 2

   2. Reduce the data transmission rate or increase the polling interval from the external serial device (PLC/HMI) to the frequency converter.

3. 3

   3. Inspect the serial communication cable (e.g., RS-485, RS-232) for physical damage, proper shielding, and correct termination resistors. Use a multimeter to check continuity on each wire.

4. 4

   4. Connect a laptop with serial monitoring software to the drive's serial port (if direct access is available) and observe the incoming data stream for excessive or corrupt messages.

5. 5

   5. Update the frequency converter's firmware to the latest version, which may contain improvements for serial communication stability and buffer management.