Zeror.ai Error Codes Siemens A01953

Siemens A01953

Brand: SiemensModel: SINAMICS G120 CU250S2Error code: A01953

What the Fault Means

Alarm: CU SYNC: Synchronization not completed

Likely causes

  • After the drive system was switched on, synchronization between the basic clock cycle and application clock cycle was started but was not completed within the selected time tolerance
  • Alarm value (r2124, interpret decimal): Only for internal Siemens troubleshooting.

Solution and Safe First Checks

  1. Carry out a POWER ON (switch-off/switch-on).

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.