Warning /Alarm 72 in Danfoss VLT FC301/ FC302 : Dangerous Failure - comes when safe Torque Off (STO) with trip lock. An unexpected combination of STO commands has occurred:

1. VLT® PTC Thermistor Card MCB 112 enables X44/10, but STO is not enabled.

2. MCB 112 is the only device using STO (specified through selection [4] PTC 1 alarm or [5] PTC 12 warning in parameter 5-19 Terminal 37 Safe Stop).

3. STO is activated, but X44/10 is not activated.