The code "Safe Stop [W68]" indicates that a safety feature on a Danfoss VLT frequency converter has been triggered. This feature, known as Safe Torque Off (STO), brings the motor to a safe stop in an emergency situation.

Here's a breakdown of the information:

1. Safe Stop: This refers to the activation of the STO function.
2. W68: This is the specific error code associated with the Safe Stop event.