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Siemens SINUMERIK Controller
Servo/Axis · Intermediate · 30-120 minutes
Siemens 300709 - Axis drive speed controller cycle times of axes differ
This alarm occurs when the speed controller cycle times differ between axes on a 2-axis module. Fix it by ensuring MD 1001: $MD_SPEEDCTRL_CYCLE_TIME is identical for both axes.
300709
Siemens 300709 - Axis drive speed controller cycle times of axes differ
Axis drive speed controller cycle times of axes differ
The speed controller cycle MD 1001: $MD_SPEEDCTRL_CYCLE_TIME must be identical for both axes on 2-axis modules 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.
Root Cause Summary
This alarm occurs when the speed controller cycle times differ between axes on a 2-axis module. Fix it by ensuring MD 1001: $MD_SPEEDCTRL_CYCLE_TIME is identical for both axes.
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 system.
- 2
Check MD 1001 values
Compare the $MD_SPEEDCTRL_CYCLE_TIME values for both axes on the module.
- 3
Set identical values
Adjust the values to be the same for both axes, then save and restart the system.
Call a technician if:
- ·If MD 1001 cannot be accessed or modified
- ·If the alarm persists after setting identical cycle times
Prevention
- Verify MD 1001 settings during setup for multi-axis modules
- Use simulation to catch configuration mismatches early
Common Mistakes
- Overlooking the second axis settings in MD 1001
- Assuming program syntax is the issue without checking machine data
Seeing Multiple Alarms?
Seeing another alarm with this one? Enter the code.
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