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Siemens SINUMERIK Controller
Program/G-code · Intermediate · 30-120 minutes
Siemens 840D 101165 - MDx103 MOTOR_NOMINAL_CURRENT <= 0
Alarm 101165 indicates that the motor nominal current parameter (MD1103) is set to zero or a negative value, which is invalid. The drive system requires a valid positive motor current rating to properly configure current control loops and thermal monitoring. This typically occurs after motor data configuration errors, incomplete commissioning, or corrupted parameter sets.
101165
Siemens 840D 101165 - MDx103 MOTOR_NOMINAL_CURRENT <= 0
MDx103 MOTOR_NOMINAL_CURRENT <= 0
Siemens SINUMERIK operator message 101165: MDx103 MOTOR_NOMINAL_CURRENT <= 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 101165 indicates that the motor nominal current parameter (MD1103) is set to zero or a negative value, which is invalid. The drive system requires a valid positive motor current rating to properly configure current control loops and thermal monitoring. This typically occurs after motor data configuration errors, incomplete commissioning, or corrupted parameter sets.
Safety
- Refer to Siemens documentation
- Ensure qualified technician performs repairs
Causes and Fixes
- 1
Access HMI commissioning mode and navigate to Drive -> Axis -> Motor Data for the affected axis.
- 2
Locate MD1103 MOTOR_NOMINAL_CURRENT and verify current value displays 0 or negative number.
- 3
Enter the motor nameplate nominal current value (in Amperes RMS) from motor manufacturer documentation into MD1103.
Entering incorrect motor current can cause motor damage, overheating, or inadequate torque. Verify exact motor model and nameplate data.
- 4
Save parameters, perform NCK power cycle (Power OFF/ON), and verify alarm clears on startup.
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