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Siemens SINUMERIK Controller
Program/G-code · Intermediate · 30-120 minutes
Siemens 840D 101135 - MDx409 SPEEDCTRL_INTEGRATOR_TIME_1 could not be calculated
This alarm indicates that the speed controller integrator time constant (T_INT) for the first axis could not be calculated automatically during drive optimization or commissioning. The calculation failure typically results from inconsistent or missing machine data parameters related to motor inertia, load inertia, or speed controller gain settings.
101135
Siemens 840D 101135 - MDx409 SPEEDCTRL_INTEGRATOR_TIME_1 could not be calculated
MDx409 SPEEDCTRL_INTEGRATOR_TIME_1 could not be calculated
Siemens SINUMERIK operator message 101135: MDx409 SPEEDCTRL_INTEGRATOR_TIME_1 could not be calculated. This is an informational message from the SINUMERIK control indicating a system status or operation result that may require operator action.
Root Cause Summary
This alarm indicates that the speed controller integrator time constant (T_INT) for the first axis could not be calculated automatically during drive optimization or commissioning. The calculation failure typically results from inconsistent or missing machine data parameters related to motor inertia, load inertia, or speed controller gain settings.
Safety
- Refer to Siemens documentation
- Ensure qualified technician performs repairs
Causes and Fixes
- 1
Access drive machine data via commissioning mode. Check MD1102 (motor moment of inertia) and verify it matches the motor nameplate data.
- 2
Verify MD1114 (total moment of inertia including load) is correctly calculated or measured. Ensure it is greater than MD1102.
- 3
Check MD1108 (load inertia moment) and ensure the ratio of load to motor inertia is within acceptable range (typically 1:1 to 10:1).
- 4
Perform a new automatic drive optimization using the Siemens STARTER or SCOUT software with corrected inertia values.
Ensure axis is properly secured and can move freely before running optimization.
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Always verify with your machine manual or a certified technician before performing service procedures.