axismd.ai
Siemens SINUMERIK Controller
Servo/Axis · Intermediate · 30-120 minutes
Siemens 27013 - Axis Safe monitoring for acceleration exceeded
Alarm 27013 indicates that during a STOP B or STOP C command, the axis velocity exceeded the safe braking tolerance threshold defined in MD $MA_SAFE_STOP_VELO_TOL. This safety alarm prevents inadequate deceleration rates that could compromise machine safety by allowing the axis to exceed acceptable velocity limits during controlled shutdown sequences.
27013
Siemens 27013 - Axis Safe monitoring for acceleration exceeded
Axis Safe monitoring for acceleration exceeded
After the initiation of STOP B or C, the velocity exceeded the tolerance value entered in MD $MA_SAFE_STOP_VELO_TOL Control reaction: Mode group not ready. Channel not ready. NC Start disable in this channel. Interface signals are set. Alarm display. NC Stop on alarm. Channel not ready. Pulse interlock by triggering a STOP A.
Root Cause Summary
Alarm 27013 indicates that during a STOP B or STOP C command, the axis velocity exceeded the safe braking tolerance threshold defined in MD $MA_SAFE_STOP_VELO_TOL. This safety alarm prevents inadequate deceleration rates that could compromise machine safety by allowing the axis to exceed acceptable velocity limits during controlled shutdown sequences.
Safety
- Drive/power/encoder circuit: hazardous voltages may remain in the DC link after power-off. Lock out / tag out, wait for discharge per the drive documentation, and use qualified personnel only.
Causes and Fixes
- 1
Access Diagnostics > Servo > Axis parameters and verify MD $MA_VELO_CTRL_PARAM (P-gain, I-gain, D-gain) values against factory defaults in the Siemens parameter list for your machine tool type.
Do not arbitrarily increase gains; contact OEM first as over-tuning can cause instability.
- 2
Check MD $MA_SAFE_STOP_DECEL (safe stop deceleration rate) is physically achievable by the axis inertia and motor torque; compare against MD $MA_MAX_ACCEL.
- 3
Run a velocity ramp test via NCK > Diagnostic > Axis Test and observe actual vs. commanded velocity response during controlled deceleration to identify servo lag.
- 4
If servo tuning is confirmed acceptable, escalate to drive firmware diagnostics (A_GROUP parameter validation in SIMODRIVE/SINAMICS) or request factory re-commissioning.
Seeing Multiple Alarms?
Seeing another alarm with this one? Enter the code.
Get machine-aware diagnosis
AxisMD logs alarms against your actual machines, tracks patterns, and gives AI context your manual doesn't have.
Start freeWas this guide helpful?
Always verify with your machine manual or a certified technician before performing service procedures.