What causes Siemens SINUMERIK alarm 300780?

SINAMICS drive hardware fault requiring investigation. Drive parameter configuration error. Axis motor or feedback system fault triggering drive protection. Communication fault on the drive bus. Power supply issue affecting the drive module.

How do I fix Siemens SINUMERIK alarm 300780?

1. Check the SINAMICS drive for active fault codes in the diagnostics screen. 2. Power cycle the machine to clear transient faults. 3. Review SINAMICS parameters for the affected drive axis. 4. Check the SINUMERIK axis diagnostics for related NC alarms. 5. Consult the Siemens SINAMICS alarm manual for alarm 300780 complete remedy.

Siemens SINUMERIK codes

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Siemens SINUMERIK Controller

Program/G-code · Intermediate · 30-120 minutes

Alarm 300780

Siemens 840D 300780 - Axis drive zero load current > rated motor current

This alarm occurs when the no-load current (MD 1136) is set higher than the rated motor current (MD 1103), indicating a configuration error. Correct the machine data settings to resolve it.

Siemens SINUMERIKProgram/G-codeIntermediate30-120 minutes

300780

Siemens 840D 300780 - Axis drive zero load current > rated motor current

Axis drive zero load current > rated motor current

Siemens SINAMICS drive alarm 300780: Axis drive zero load current > rated motor current. This alarm indicates a fault condition in the SINAMICS servo drive system. Refer to the Siemens SINAMICS fault list documentation for the complete remedy.

Root Cause Summary

This alarm occurs when the no-load current (MD 1136) is set higher than the rated motor current (MD 1103), indicating a configuration error. Correct the machine data settings to resolve it.

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Causes and Fixes

1
Access Machine Data
Navigate to the machine data parameters in the Siemens control system.
2
Check Values
Compare MD 1136 (no-load current) with MD 1103 (rated motor current). Ensure MD 1136 is less than or equal to MD 1103.
3
Adjust and Save
Correct the value of MD 1136 if necessary, save changes, and reset the control.

DIY Feasiblehigh confidence

Call a technician if:

·If the alarm persists after correcting machine data
·If access to machine data parameters is restricted

Prevention

Double-check motor data during initial setup
Document correct machine data values for reference
Always backup machine data before making parameter changes
Verify motor specifications against nameplate data during commissioning

Common Mistakes

Entering incorrect motor current values
Overlooking related machine data parameters

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