Zeror.ai Error Codes Siemens A01790

Siemens A01790

Brand: SiemensModel: SINAMICS G120 CU250S2Error code: A01790

What the Fault Means

Alarm: SI: Power up stopped due to STO via terminals

Likely causes

  • When powering up, the automatic internal self test of the Control Unit was not able to be completed as the pulses were not enabled
  • It is possible that the "STO via terminals at the Power Module" function is being used, and STO is selected in at least one hardware switch-off signal path at the Power Module
  • 1048 SINAMICS G120 CU250S-2 Control Units List Manual (LH15), 01/2016, A5E33842890 4 Faults and alarms 4.2 List of faults and alarms

Solution and Safe First Checks

  1. Deselect STO via the STO terminals at the Power Module (connect STO_A and STO_B to 24 V).
  2. if required, de-activate the "STO via terminals at the Power Module" function via the DIP switch (both DIP switches

Safety: do not work inside the panel without isolating the power; if unsure, consult a qualified technician.

Related Siemens error codes

Source: the Zeror.ai industrial fault database and Siemens technical documentation. This page is for information; on critical systems follow the manufacturer's manual and authorised service.

Siemens A01790 · Zeror.ai