Siemens alarm 25040: Axis %1 standstill monitoring
SINUMERIK 828D alarm · Siemens 828D
What it means
With zero command velocity, the axis left the standstill window (MD36030 $MA_STANDSTILL_POS_TOL) after expiry of MD36040 $MA_STANDSTILL_DELAY_TIME. Follow-up mode protects the machine; repeated occurrence usually indicates mechanics or servo tuning rather than electronics.
Likely causes
- Cutting/jamming forces exceeding holding capability
- Failing counterbalance or vertical-axis brake
- Low Kv factor (MD32200 $MA_POSCTRL_GAIN)
- Standstill tolerances smaller than exact-stop windows
Need the part urgently?
Send us alarm 25040 with your machine details — typical RFQ turnaround is 24–48h.