HPFB bus timeout

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No serial communication is occurring with the adjustable frequency drive’s communication option card (HPFB bus). This warning is active only when parameter 804 (Bus time interval function) is set to a value other than OFF. If set to 'Stop and trip', it will ramp down and trip into an alarm state.

• Disconnection or damage to the fieldbus cable (e.g., Profibus DP cable) connected to the HPFB option card.
• Incorrect Profibus address (P801) or baud rate (P802) configuration on the HPFB card or the Profibus master.
• Profibus master (PLC CPU or communication module) is not active, stopped, or not sending data frames.
• Faulty HPFB communication option card or its internal connection to the drive's main control board.
• Missing or incorrect termination resistor on the Profibus segment where the drive's HPFB card is located.

Klikk på steg for å spore fremgangen.

1. 1

   Verify the Profibus cable connections to the HPFB option card and at the Profibus master. Ensure connectors are securely seated.

2. 2

   Check the HPFB card's parameters (P801 for Profibus address, P802 for baud rate) and ensure they match the Profibus master's configuration.

3. 3

   Confirm the Profibus master's status (PLC diagnostic buffer) to ensure it is active and attempting to communicate with the drive's address.

4. 4

   Inspect the HPFB option card for visible damage or improper seating within the drive's option slot. Re-seat the card if necessary.

5. 5

   Check for proper Profibus termination resistors at the beginning and end of the Profibus segment, ensuring they are correctly switched ON/OFF.

6. 6

   Using a Profibus diagnostic tool, analyze bus traffic and signal quality on the segment to identify communication errors or signal loss.