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Siemens SINUMERIK Controller
Program/G-code · Intermediate · 30-120 minutes
Siemens 840D 101143 - MDx142 FIELD_WEAKENING_SPEED = 0
Alarm 101143 indicates that the field weakening speed parameter (MD142 FIELD_WEAKENING_SPEED) has been set to zero, which is an invalid configuration for motors requiring field weakening operation. This parameter defines the speed threshold where field weakening begins for spindle or axis drives, and a zero value prevents proper motor operation at higher speeds.
101143
Siemens 840D 101143 - MDx142 FIELD_WEAKENING_SPEED = 0
MDx142 FIELD_WEAKENING_SPEED = 0
Siemens SINUMERIK operator message 101143: MDx142 FIELD_WEAKENING_SPEED = 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 101143 indicates that the field weakening speed parameter (MD142 FIELD_WEAKENING_SPEED) has been set to zero, which is an invalid configuration for motors requiring field weakening operation. This parameter defines the speed threshold where field weakening begins for spindle or axis drives, and a zero value prevents proper motor operation at higher speeds.
Safety
- Refer to Siemens documentation
- Ensure qualified technician performs repairs
Causes and Fixes
- 1
Access Siemens startup commissioning mode (service level access required). Navigate to machine data for the affected axis/spindle.
- 2
Locate MD142 FIELD_WEAKENING_SPEED parameter for the alarmed drive axis. Check current value and verify it is set to 0.
- 3
Consult motor nameplate and drive documentation to determine correct field weakening speed value. Typically set to motor rated speed (e.g., 1500 RPM for standard motors) or 1.5-2x base speed.
Incorrect field weakening speed can cause motor overheating, reduced torque, or drive faults.
- 4
Enter the correct field weakening speed value into MD142, perform a drive reset (power cycle NCU if necessary), and clear the alarm. Test axis/spindle operation through full speed range.
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