Option External Fault (CP-916)

What does EFO mean?

This fault occurs when an external fault condition is detected via the CP-916 option card, specifically when the inverter is configured for serial communication using this card. The trip condition (open or closed) is defined by parameter F9-01. This signifies that an external safety or process interlock, monitored by the CP-916, has been triggered, requiring immediate attention.

• External safety device or interlock connected to the CP-916 card's digital input (if available) has activated.
• Misconfiguration of external fault handling parameters within the CP-916 card's settings or associated inverter parameters.
• Communication error between the CP-916 card and the external device providing the fault signal.
• Faulty CP-916 option card itself, falsely reporting an external fault.
• Power supply issue to the CP-916 card or its connected external devices.

Click steps to track your progress.

1. 1

   Consult the CP-916 manual to identify which digital inputs or communication registers on the card trigger an "Option External Fault".

2. 2

   Check the status of any external devices wired directly to inputs on the CP-916 card.

3. 3

   Verify the communication parameters and fault handling settings configured within the CP-916 card.

4. 4

   Measure the voltage at the relevant input terminals on the CP-916 card (if accessible) when the fault occurs.

5. 5

   Power cycle the inverter and the CP-916 card to reset internal logic.

6. 6

   If possible, swap the CP-916 card with a known good spare to rule out card failure.