Safe Disable Circuit Fault

What does Safe Disable Fault mean?

The drive output is disabled, but only one of the Safe Disable inputs (H1 or H2) is detected as open, which indicates an abnormal condition. This could be due to an internal fault within one channel of the drive's safe disable circuit or an incorrect, asynchronous signal from the external safety controller.

• One channel of the Safe Disable input (e.g., terminal H1 or H2) has an open circuit, while the other remains closed, indicating an unbalanced state.
• External wiring fault (e.g., loose connection, broken wire) in one of the Safe Disable input circuits (terminal H1 or H2) upstream of the drive.
• Internal relay or optocoupler failure within the drive's Safe Disable circuit, causing one channel to falsely register an open state.
• External safety device (e.g., emergency stop button, safety gate switch) connected to only one Safe Disable input has actuated or faulted.

Click steps to track your progress.

1. 1

   1. De-energize the drive and verify the integrity of external safety wiring connected to Safe Disable inputs H1 and H2 by measuring continuity across each circuit separately.

2. 2

   2. Check the state of external safety devices (e.g., E-stop, safety interlock) connected to H1 and H2; ensure all are closed and functional.

3. 3

   3. Measure the voltage potential at terminals H1 and H2 relative to a common reference (e.g., 0V) to confirm identical input states.

4. 4

   4. Temporarily bypass the external safety circuit with jumpers (only for testing, under strict safety protocols) at terminals H1 and H2 to isolate an external wiring fault.

5. 5

   5. Cycle power to the drive after rectifying any external wiring or device issues to clear the fault.