DSP received too many unknown SPI telegrams / MCO power-up issue

What does 1795 mean?

The digital signal processor (DSP) received an excessive number of unknown SPI (Serial Peripheral Interface) telegrams. This fault code can also indicate an MCO (Motor Control Option) power-up issue, potentially caused by poor EMC protection or improper grounding.

• Electromagnetic interference (EMI) ingress corrupting SPI (Serial Peripheral Interface) communication lines between internal modules.
• Incompatible MCO (Motor Control Option) card firmware or hardware revision installed.
• Faulty MCO card or a loose connection of its ribbon cable to the main control board.
• Timing mismatch or clock synchronization issues on the SPI bus causing unknown telegram reception.
• Internal component failure on either the DSP board or the MCO card causing spurious data transmission.

Click steps to track your progress.

1. 1

   Verify secure seating of the MCO card in its designated slot and inspect ribbon cable connections.

2. 2

   Check for and address potential sources of EMI near the drive and control cabinet wiring.

3. 3

   Confirm the MCO card hardware revision is compatible with the main control board and drive firmware.

4. 4

   Attempt to update the firmware of the MCO card, if applicable, using the specified programming tool.

5. 5

   Temporarily remove the MCO card from its slot and power up the drive to see if the fault clears (indicates MCO issue).