Safe Disable Function Active

What does Safe Disable mean?

Both Safe Disable inputs (H1 and H2) are detected as open, indicating that the drive's output is intentionally and safely disabled by an external safety circuit. This state prevents the motor from starting and is a normal condition when the machine's safety function is engaged.

• External safety circuit (e.g., safety relay, light curtain, E-stop button) connected to Safe Disable inputs (H1, H2) is in a tripped or open state.
• Incorrect wiring or loose connections on the Safe Disable input terminals (H1, H2), causing an open circuit condition.
• The external safety circuit itself has a fault (e.g., stuck open contact, broken wire) preventing it from closing the Safe Disable inputs.
• Deliberate activation of an E-stop button or safety gate that is wired to the Safe Disable inputs.
• Incorrect configuration of Safe Disable input parameters (e.g., H1-xx assigned to Safe Disable is 'Not Used' or miswired).

Click steps to track your progress.

1. 1

   1. Verify the state of the external safety circuit connected to the Safe Disable inputs (H1, H2). Ensure all safety devices (e.g., E-stop, safety gate, light curtain) are in a safe, closed position.

2. 2

   2. Measure the voltage at the Safe Disable input terminals (H1, H2) relative to the common (e.g., S1) or GND. Expect 24VDC if the circuit is closed, 0VDC if open.

3. 3

   3. Inspect the wiring from the external safety circuit to the drive's Safe Disable terminals (H1, H2) for continuity, secure connections, and any damage.

4. 4

   4. Confirm that the drive's Safe Disable inputs (H1, H2) are correctly wired to the appropriate output contacts of the external safety relay or safety PLC.

5. 5

   5. Check the drive's internal monitor (e.g., U1-xx status bits) to confirm that both H1 and H2 inputs are detected as open.

6. 6

   6. If the fault persists and external safety circuits are verified functional and closed, there might be an internal issue with the drive's Safe Disable input monitoring circuit, requiring drive repair.