SLS enable missing

What does F01683 mean?

The Safely Limited Speed (SLS) function is not enabled, even though it's required or configured for the application. This prevents the system from limiting speed safely, potentially leading to hazardous overspeed conditions if the drive operates outside its safe limits.

• Parameter p9500 (SLS enable) is not set to 1 (Enabled) despite the application requiring Safely Limited Speed.
• The external safety PLC or safety circuit has not provided the necessary enable signal to activate the SLS function.
• Interference or fault on the safety input terminals for SLS (e.g., X124/X125 for STO, which often precedes SLS activation), preventing proper enabling.
• An internal safety chain component related to SLS has failed or is in an invalid state.

Click steps to track your progress.

1. 1

   1. Check parameter p9500 (SLS enable) and ensure it is set to 1 if Safely Limited Speed is required for the application.

2. 2

   2. Verify the status of the external safety PLC or safety relay outputs that provide the enable signal for SLS, checking for voltage levels on relevant safety terminals.

3. 3

   3. Inspect the wiring and connections of the safety input terminals (e.g., safety input 1, safety input 2) for SLS for damage or improper termination.

4. 4

   4. Confirm that any preceding safety functions (e.g., STO) are correctly enabled and not causing a lockout for SLS.

5. 5

   5. Perform a safety reset (e.g., by cycling the STO inputs or using a dedicated safety reset parameter like p9699) after addressing the root cause.