Danfoss VLT FCD300, FCD 302 & DSD 510 Decentral Drive
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Mar 05, 2024 5:11 am
Cause : Dangerous failure STO with trip lock. An unexpected combination of STO commands has occurred:
- VLT® PTC Thermistor Card MCB 112 enables X44/10, but STO is not enabled.
- MCB 112 is the only device using STO (specified through selection [4] PTC 1 alarm or [5] PTC 1 warning in parameter 5-19 Terminal 37 Digital Input), STO is activated, and X44/10 is not activated
