Siemens alarm 2003*: Zero speed monitoring
SINUMERIK 840C legacy alarm · Siemens 840C
What it means
Spindle-specific standstill supervision: when positioning/clamped, the following error was not eliminated within the 'Cutoff delay servo enable' time, or the clamped spindle was pushed outside the 'Zero speed monitoring' window. Indicates drive/actuator/tacho faults, mechanical displacement or commissioning errors such as wrong position-control sense.
Likely causes
- Fault in activating device, tacho or spindle motor
- Clamped spindle mechanically displaced
- Wrong setpoint-output assignment or control direction at start-up
- 'Zero speed monitoring' MD smaller than 'Exact stop limit coarse'
Triage note: * suffix = spindle index
Need the part urgently?
Send us alarm 2003* with your machine details — typical RFQ turnaround is 24–48h.