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Siemens SINUMERIK Controller
Program/G-code · Intermediate · 30-120 minutes
Siemens 840D 101138 - MDx139/MDx140 MD_STATOR-/ROTOR_LEAKAGE_REACTANCE = 0
Alarm 101138 occurs when machine data parameters MD31139 (stator leakage reactance) or MD31140 (rotor leakage reactance) are set to zero for an asynchronous motor configuration. These parameters are critical for motor model calculations in vector control mode, and zero values prevent proper motor field-oriented control and current model calculations.
101138
Siemens 840D 101138 - MDx139/MDx140 MD_STATOR-/ROTOR_LEAKAGE_REACTANCE = 0
MDx139/MDx140 MD_STATOR-/ROTOR_LEAKAGE_REACTANCE = 0
Siemens SINUMERIK operator message 101138: MDx139/MDx140 MD_STATOR-/ROTOR_LEAKAGE_REACTANCE = 0. This is an informational message from the SINUMERIK control indicating a system status or operation result that may require operator action.
Root Cause Summary
Alarm 101138 occurs when machine data parameters MD31139 (stator leakage reactance) or MD31140 (rotor leakage reactance) are set to zero for an asynchronous motor configuration. These parameters are critical for motor model calculations in vector control mode, and zero values prevent proper motor field-oriented control and current model calculations.
Safety
- Refer to Siemens documentation
- Ensure qualified technician performs repairs
Causes and Fixes
- 1
Access the drive commissioning menu: navigate to HMI > Commissioning > Drive > Axis selection, select the affected axis.
- 2
Check MD31139 (STATOR_LEAKAGE_REACTANCE) and MD31140 (ROTOR_LEAKAGE_REACTANCE) values in the motor parameter list. Verify both are non-zero.
- 3
If values are zero, enter correct motor parameters from motor nameplate data or use SINAMICS motor identification procedure to automatically determine values.
Incorrect motor parameters can cause instability, motor overheating, or drive faults. Use motor manufacturer data or auto-identification only.
- 4
Perform NCK reset (Part Program reset) or power cycle the control after saving machine data to activate new parameters.
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Always verify with your machine manual or a certified technician before performing service procedures.