Delta STO1 fault code meaning
Delta / STO1
Series: VP3000-E, VP3000
Safe torque output stop 1
AC motor drive
Meaning: The difference in activation time between channels 1 and 2 is too large, and channel 1 is activated.
Possible causes
- Problem with external equipment on the channel
Source: VP3000-E & VP3000-EHS User Manual (DELTA_IA-MDS_VP3000-E-VP3000-EHS_UM_SC_20260306) P402; VP3000 Series User Manual (DELTA_IA-MDS_VP3000_UM_TC_20250523) P437