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Siemens SINUMERIK Controller
Servo/Axis · Intermediate · 30-120 minutes
Siemens 300764 - Axis drive emergency retraction mode/generator mode not
This alarm occurs when emergency retraction or generator mode is attempted without active DC link measurement, often due to incorrect machine data settings or unsupported hardware. Fix by verifying and adjusting MD 1161 settings or program logic.
300764
Siemens 300764 - Axis drive emergency retraction mode/generator mode not
Axis drive emergency retraction mode/generator mode not
Emergency retraction/Generator operation is only possible with an active DC link measurement (MD 1161: $MD_FIXED_LINK_VOLTAGE (DC link fixed voltage = 0). In an old hardware version, no DC link measurement is possible and therefore the error message 300765 might appear in addition if MD 1161: $MD_FIXED_LINK_VOLTAGE (DC link fixed voltage) is set to 0 in an old hardware version Control reaction: NC not ready. The NC switches to follow-up mode. Channel not ready. NC Start disable in this channel. Interface signals are set. Alarm display. NC Stop on alarm. Channel not ready.
Root Cause Summary
This alarm occurs when emergency retraction or generator mode is attempted without active DC link measurement, often due to incorrect machine data settings or unsupported hardware. Fix by verifying and adjusting MD 1161 settings or program logic.
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
Check MD 1161 Setting
Access machine data via the control panel and verify if MD 1161 is set to 0 (active DC link measurement).
- 2
Adjust Machine Data
If not set to 0, update MD 1161 as per machine manual and save changes.
- 3
Restart System
Power cycle the machine or reset the control to apply changes, then test the program again.
Call a technician if:
- ·If MD 1161 cannot be adjusted or alarm persists after changes
- ·If hardware limitations are suspected and documentation is unclear
Prevention
- Verify machine data settings before enabling special modes
- Simulate programs to catch unsupported functions early
Common Mistakes
- Overlooking MD 1161 value in machine data
- Assuming all hardware supports emergency retraction mode
Related Alarms
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