axismd.ai

Siemens SINUMERIK Controller

Servo/Axis · Intermediate · 30-120 minutes

Alarm 300858

Siemens 300858 - Axis drive generator mode: response voltage > switch-off

This alarm occurs when the sum of response voltage and hysteresis exceeds the deactivation threshold for generator mode in the drive parameters. Adjust the values in MD1631, MD1632, or MD1633 to resolve.

Siemens SINUMERIKServo/AxisIntermediate30-120 minutes

300858

Q: How do I fix Siemens SINUMERIK alarm 300858?

1. Please inform the authorized personnel/service department. 2. Modify drive machine data - Modify MD 1631: $MD_LINK_VOLTAGE_GEN_ON (response voltage for generator axis) or - Modify MD 1632: $MD_LINK_VOLTAGE_GEN_HYST (voltage range for generator control) or - Modify MD 1633: $MD_LINK_VOLTAGE_GEN_OFF (voltage range for generator control) or 3. Alarm display showing cause of alarm disappears. No further operator action necessary

Siemens 300858 - Axis drive generator mode: response voltage > switch-off

Axis drive generator mode: response voltage > switch-off

The sum of the values in MD1631: $MD_LINK_VOLTAGE_GEN_ON (response voltage for generator axis) + MD1632: $MD_LINK_VOLTAGE_GEN_HYST (voltage range for generator control) is greater than MD1633: $MD_LINK_VOLTAGE_GEN_OFF (deactivation threshold for generator axis) Control reaction: Interface signals are set. Alarm display.

Root Cause Summary

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
Access machine data
Navigate to the machine data settings in the Siemens control panel.
2
Check values
Verify the values in MD1631, MD1632, and MD1633 for the affected axis and drive.
3
Adjust parameters
Reduce MD1631 or MD1632, or increase MD1633 to ensure the sum is below the threshold.
4
Restart system
Clear the alarm and restart the system to apply changes.

DIY Feasiblehigh confidence

Call a technician if:

·If parameter adjustments do not resolve the alarm
·If unsure about safe parameter values for the machine

Prevention

Always backup machine parameters before modifications
Document parameter changes during setup with date and reason
Validate machine data after updates or imports
Perform regular parameter audits against baseline configurations

Common Mistakes

Overlooking the specific axis/drive in the alarm message
Setting arbitrary values without checking thresholds

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.