Device External Fault

What does 51 mean?

A user-specified digital input signal (configured with parameter P3.5.1.11 or P3.5.1.12) was activated, triggering an external fault. This indicates an issue with an external device or its signaling to the drive, which is configured to stop the drive upon activation.

• An external safety device (e.g., emergency stop, thermal overload relay, limit switch) connected to a digital input has activated.
• A wiring fault (e.g., open circuit, short to common) in the digital input circuit configured for external fault (e.g., P3.5.1.11 or P3.5.1.12).
• The digital input's polarity configuration (e.g., P3.5.1.13 for DI1 polarity) does not match the external device's output logic (N.O. vs N.C.).
• Intermittent contact in the external fault circuit due to vibration, worn contacts in a relay, or a loose terminal connection.

Click steps to track your progress.

1. 1

   1. Identify the specific digital input configured as an external fault (e.g., check P3.5.1.11 or P3.5.1.12) and its corresponding terminal (e.g., DI1, DI2).

2. 2

   2. Inspect the external device connected to this digital input (e.g., motor overload, safety gate) for its operational status and reset if necessary.

3. 3

   3. Using a multimeter, measure the voltage at the identified digital input terminal relative to common (0VDC) to confirm its current state and compare it to expected logic.

4. 4

   4. Check the continuity of the wiring from the external device's contacts to the drive's digital input terminal for any breaks or unintended shorts.

5. 5

   5. Verify the digital input's function assignment and polarity parameter (e.g., P3.5.1.13 for DI1 polarity) to ensure it correctly interprets the external device's signal.