Siemens SINUMERIK codes
AxisMD

axismd.ai

Siemens SINUMERIK Controller

Servo/Axis · Intermediate · 30-120 minutes

Alarm 300860

Siemens 300860 - Axis drive generator mode: emergency retraction speed > max.

This alarm occurs when the emergency retraction speed in MD1639 exceeds the maximum motor speed in MD1146. Adjust the retraction speed or consult machine data to resolve.

Siemens SINUMERIKServo/AxisIntermediate30-120 minutes

300860

Siemens 300860 - Axis drive generator mode: emergency retraction speed > max.

Axis drive generator mode: emergency retraction speed > max.

The value entered for the emergency retraction speed in MD1639: $MD_RETRACT_SPEED (emergency retraction speed) is greater than MD1146: $MD_MOTOR_MAX_ALLOWED_SPEED (maximum motor speed) Control reaction: Interface signals are set. Alarm display.

Root Cause Summary

This alarm occurs when the emergency retraction speed in MD1639 exceeds the maximum motor speed in MD1146. Adjust the retraction speed or consult machine data to resolve.

Safety

  • Drive/power/encoder circuit: hazardous voltages may remain in the DC link after power-off. Lock out / tag out, wait for discharge per the drive documentation, and use qualified personnel only.

Causes and Fixes

  1. 1

    Check machine data

    Access MD1639 and compare the emergency retraction speed with MD1146 ($MD_MOTOR_MAX_ALLOWED_SPEED).

  2. 2

    Adjust retraction speed

    Reduce the value in MD1639 to be within the limit specified in MD1146.

  3. 3

    Reset and test

    Clear the alarm and test the program to confirm the issue is resolved.

DIY Feasiblehigh confidence

Call a technician if:

  • ·If adjusting MD1639 or MD1146 does not resolve the alarm
  • ·If machine data values are unclear or inaccessible

Prevention

  • Validate machine data settings before running programs
  • Document custom changes to machine data for reference
  • Ensure proper safety procedures are followed when modifying machine parameters
  • Regular backup of machine data before making changes

Common Mistakes

  • Overlooking MD1146 limits when setting retraction speeds
  • Failing to save changes after adjusting machine data

Seeing Multiple Alarms?

Seeing another alarm with this one? Enter the code.

Get machine-aware diagnosis

AxisMD logs alarms against your actual machines, tracks patterns, and gives AI context your manual doesn't have.

Start free

Was this guide helpful?

Always verify with your machine manual or a certified technician before performing service procedures.